{
  "source": {
    "title": "A Complete Guide To Every Fundamental In Spanish (The Conclusion)",
    "url": "https://youtube.com/watch?v=YHDZSHCt1DE",
    "duration_sec": 14810
  },
  "totals": {
    "chapters": 52,
    "rules": 168,
    "examples": 572,
    "vocab": 410,
    "tables": 143,
    "exercises": 370
  },
  "chapters": [
    {
      "chapter_id": "01",
      "slug": "the-introduction",
      "title": "The Introduction",
      "time_range_sec": [
        0,
        64
      ],
      "summary": "Author introduces the 4-hour compilation video as a stitched collection of every prior Spanish-fundamentals video on his channel, with two intentionally omitted topics (gustar-style verbs; qué vs. cuál; c vs. qu).",
      "suggested_grammar_note_id": null,
      "rules": [],
      "examples": [],
      "vocab": [],
      "conjugation_tables": [],
      "exercises": [],
      "caveats": "Intro chapter; no teachable grammar content."
    },
    {
      "chapter_id": "02",
      "slug": "spanish-fundamentals",
      "title": "Spanish Fundamentals",
      "time_range_sec": [
        64,
        632
      ],
      "summary": "Foundational vocabulary survey covering the alphabet, accent marks, question words, prepositions/adverbs, pronouns, days, months, seasons, time words, and numbers.",
      "suggested_grammar_note_id": "accent-marks-stress",
      "rules": [
        {
          "title": "Alphabet & pronunciation",
          "bullets": [
            "27 letters: English alphabet plus ñ.",
            "H is silent: hablo sounds like 'ablo'.",
            "ll sounds like English 'y' (llave = key).",
            "Some traditions also count ch and ll as letters (29 total)."
          ]
        },
        {
          "title": "Accents distinguish words",
          "bullets": [
            "él (he) vs el (the).",
            "tú (you) vs tu (your).",
            "sí (yes) vs si (if).",
            "qué (what?) vs que (that).",
            "dónde (where?) vs donde (relative where).",
            "¿Por qué? = why?  ·  porque = because (one word, no accent)."
          ]
        },
        {
          "title": "Punctuation",
          "bullets": [
            "Questions wrap with ¿ … ?",
            "Exclamations wrap with ¡ … !"
          ]
        },
        {
          "title": "Capitalization",
          "bullets": [
            "Days, months, and seasons are NOT capitalized in Spanish."
          ]
        },
        {
          "title": "Spelling traps",
          "bullets": [
            "año (year) vs ano (anus) — ñ matters.",
            "pero (but) vs perro (dog) — double rr matters.",
            "mañana = tomorrow OR morning (context).",
            "como = 'like/as' OR 'I eat' (context)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo hablo español.",
          "en": "I speak Spanish.",
          "tags": [
            "pronoun",
            "verb"
          ]
        },
        {
          "es": "Él habló.",
          "en": "He spoke.",
          "tags": [
            "accent"
          ]
        },
        {
          "es": "¿Dónde estás?",
          "en": "Where are you?",
          "tags": [
            "question"
          ]
        },
        {
          "es": "Aquí es de donde yo vengo.",
          "en": "This is where I come from.",
          "tags": [
            "relative"
          ]
        },
        {
          "es": "Yo quería decirte que estoy feliz.",
          "en": "I wanted to tell you that I'm happy.",
          "tags": [
            "que"
          ]
        },
        {
          "es": "¿Por qué? Porque sí.",
          "en": "Why? Because (just because).",
          "tags": [
            "por-que",
            "porque"
          ]
        },
        {
          "es": "Estoy en segundo lugar.",
          "en": "I'm in second place.",
          "tags": [
            "ordinal"
          ]
        },
        {
          "es": "Unos minutos.",
          "en": "A few minutes.",
          "tags": [
            "indefinite"
          ]
        }
      ],
      "vocab": [
        {
          "es": "hola",
          "en": "hello",
          "pos": "interjection"
        },
        {
          "es": "hablar",
          "en": "to speak",
          "pos": "verb"
        },
        {
          "es": "año",
          "en": "year",
          "pos": "noun"
        },
        {
          "es": "mañana",
          "en": "tomorrow / morning",
          "pos": "noun/adverb"
        },
        {
          "es": "hoy",
          "en": "today",
          "pos": "adverb"
        },
        {
          "es": "ayer",
          "en": "yesterday",
          "pos": "adverb"
        },
        {
          "es": "lunes",
          "en": "Monday",
          "pos": "noun"
        },
        {
          "es": "enero",
          "en": "January",
          "pos": "noun"
        },
        {
          "es": "verano",
          "en": "summer",
          "pos": "noun"
        },
        {
          "es": "primavera",
          "en": "spring",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "_____ hablo español.",
          "correct": "Yo",
          "distractor": "Tú",
          "explanation": "yo = I; matches the -o conjugation hablo."
        },
        {
          "sentence": "¿_____ estás? — Estoy en casa.",
          "correct": "Dónde",
          "distractor": "Donde",
          "explanation": "Question words take an accent."
        },
        {
          "sentence": "_____ qué estudias español? — Porque me gusta.",
          "correct": "Por",
          "distractor": "Para",
          "explanation": "¿Por qué? = Why?; the response uses one-word porque."
        },
        {
          "sentence": "Un _____ tiene doce meses.",
          "correct": "año",
          "distractor": "ano",
          "explanation": "año (with ñ) = year."
        },
        {
          "sentence": "Tengo un _____. Se llama Rex.",
          "correct": "perro",
          "distractor": "pero",
          "explanation": "perro (rr) = dog; pero = but."
        },
        {
          "sentence": "Hoy es _____, mañana es martes.",
          "correct": "lunes",
          "distractor": "Lunes",
          "explanation": "Days aren't capitalized in Spanish."
        }
      ],
      "caveats": "OCR severely garbled some slides (number/letter list); reconstructed standard Spanish vocabulary from author's spoken intent."
    },
    {
      "chapter_id": "03",
      "slug": "conjugating-verbs-present",
      "title": "Conjugating Verbs (Present)",
      "time_range_sec": [
        632,
        983
      ],
      "summary": "How to conjugate regular -ar/-er/-ir verbs in the present indicative by dropping the infinitive ending and adding one of six person endings.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Identifying verbs",
          "bullets": [
            "English infinitives use 'to' (to eat).",
            "Spanish infinitives end in -ar, -er, or -ir."
          ]
        },
        {
          "title": "Conjugation procedure",
          "bullets": [
            "Drop the -ar/-er/-ir ending.",
            "Add the ending that matches the subject pronoun.",
            "Six endings per tense (one per pronoun)."
          ]
        },
        {
          "title": "Practical focus",
          "bullets": [
            "yo, tú, él, ellos are by far the most-used persons in conversation.",
            "Subject pronouns are usually omitted because the verb ending tells you who.",
            "-er and -ir share endings except for nosotros and vosotros."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo hablo español.",
          "en": "I speak Spanish.",
          "tags": [
            "hablar"
          ]
        },
        {
          "es": "Tú hablas mucho.",
          "en": "You talk a lot.",
          "tags": [
            "hablar"
          ]
        },
        {
          "es": "Ella habla con su madre.",
          "en": "She talks with her mother.",
          "tags": [
            "hablar"
          ]
        },
        {
          "es": "Nosotros hablamos inglés.",
          "en": "We speak English.",
          "tags": [
            "hablar"
          ]
        },
        {
          "es": "Yo como pizza.",
          "en": "I eat pizza.",
          "tags": [
            "comer"
          ]
        },
        {
          "es": "Comemos en casa.",
          "en": "We eat at home.",
          "tags": [
            "comer"
          ]
        },
        {
          "es": "Ellos comen tacos.",
          "en": "They eat tacos.",
          "tags": [
            "comer"
          ]
        },
        {
          "es": "Yo vivo en Madrid.",
          "en": "I live in Madrid.",
          "tags": [
            "vivir"
          ]
        },
        {
          "es": "Tú vives cerca.",
          "en": "You live nearby.",
          "tags": [
            "vivir"
          ]
        },
        {
          "es": "Ellos viven juntos.",
          "en": "They live together.",
          "tags": [
            "vivir"
          ]
        }
      ],
      "vocab": [
        {
          "es": "hablar",
          "en": "to speak",
          "pos": "verb"
        },
        {
          "es": "comer",
          "en": "to eat",
          "pos": "verb"
        },
        {
          "es": "vivir",
          "en": "to live",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "hablo",
            "tu": "hablas",
            "el": "habla",
            "nosotros": "hablamos",
            "vosotros": "habláis",
            "ellos": "hablan"
          }
        },
        {
          "verb": "comer",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "como",
            "tu": "comes",
            "el": "come",
            "nosotros": "comemos",
            "vosotros": "coméis",
            "ellos": "comen"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "vivo",
            "tu": "vives",
            "el": "vive",
            "nosotros": "vivimos",
            "vosotros": "vivís",
            "ellos": "viven"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ español todos los días.",
          "correct": "hablo",
          "distractor": "hablas",
          "explanation": "yo takes -o in -ar verbs: hablo."
        },
        {
          "sentence": "Tú _____ pizza los viernes.",
          "correct": "comes",
          "distractor": "comen",
          "explanation": "tú takes -es in -er verbs: comes."
        },
        {
          "sentence": "Nosotros _____ en Madrid.",
          "correct": "vivimos",
          "distractor": "vivís",
          "explanation": "nosotros + -ir = -imos."
        },
        {
          "sentence": "Ellos _____ con sus amigos.",
          "correct": "hablan",
          "distractor": "habla",
          "explanation": "ellos + -ar = -an."
        },
        {
          "sentence": "Ella _____ mucho café.",
          "correct": "come",
          "distractor": "como",
          "explanation": "ella + -er = -e (like the él form)."
        },
        {
          "sentence": "Yo _____ cerca de la escuela.",
          "correct": "vivo",
          "distractor": "vive",
          "explanation": "yo + -ir = -o."
        }
      ],
      "caveats": null
    },
    {
      "chapter_id": "04",
      "slug": "articles",
      "title": "Articles",
      "time_range_sec": [
        983,
        1134
      ],
      "summary": "Definite (el/la/los/las) and indefinite (un/una/unos/unas) articles, gender/number agreement, and common exceptions like el problema, el día, la mano, la foto.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Gender by ending (defaults)",
          "bullets": [
            "Nouns ending in -o tend to be masculine (el libro).",
            "Nouns ending in -a tend to be feminine (la piscina).",
            "Nouns ending in -d are usually feminine (la ciudad).",
            "Nouns ending in -ción are feminine (la acción)."
          ]
        },
        {
          "title": "Common exceptions",
          "bullets": [
            "Greek-origin -ma nouns are masculine: el problema, el programa, el tema.",
            "el día and el agua are masculine articles (agua takes el for euphony).",
            "la foto, la moto are feminine (short for fotografía, motocicleta).",
            "la clase, la carne are feminine despite ending in -e."
          ]
        },
        {
          "title": "un vs uno",
          "bullets": [
            "un libro = a book.",
            "uno = one (number, stands alone, not before a masculine noun).",
            "una libro is wrong — agreement must match the noun's gender."
          ]
        }
      ],
      "examples": [
        {
          "es": "el libro",
          "en": "the book",
          "tags": [
            "definite",
            "masculine"
          ]
        },
        {
          "es": "la piscina",
          "en": "the pool",
          "tags": [
            "definite",
            "feminine"
          ]
        },
        {
          "es": "los libros",
          "en": "the books",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "las piscinas",
          "en": "the pools",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "un libro",
          "en": "a book",
          "tags": [
            "indefinite"
          ]
        },
        {
          "es": "una piscina",
          "en": "a pool",
          "tags": [
            "indefinite"
          ]
        },
        {
          "es": "unos libros",
          "en": "some books",
          "tags": [
            "indefinite",
            "plural"
          ]
        },
        {
          "es": "unas piscinas",
          "en": "some pools",
          "tags": [
            "indefinite",
            "plural"
          ]
        },
        {
          "es": "la clase",
          "en": "the class",
          "tags": [
            "exception"
          ]
        },
        {
          "es": "la ciudad",
          "en": "the city",
          "tags": [
            "exception",
            "-d"
          ]
        },
        {
          "es": "el problema",
          "en": "the problem",
          "tags": [
            "exception",
            "-ma"
          ]
        },
        {
          "es": "el día",
          "en": "the day",
          "tags": [
            "exception"
          ]
        },
        {
          "es": "el agua",
          "en": "the water",
          "tags": [
            "exception",
            "stressed-a"
          ]
        },
        {
          "es": "la foto",
          "en": "the photo",
          "tags": [
            "exception",
            "abbreviation"
          ]
        }
      ],
      "vocab": [
        {
          "es": "libro",
          "en": "book",
          "pos": "noun"
        },
        {
          "es": "piscina",
          "en": "pool",
          "pos": "noun"
        },
        {
          "es": "clase",
          "en": "class",
          "pos": "noun"
        },
        {
          "es": "carne",
          "en": "meat",
          "pos": "noun"
        },
        {
          "es": "ciudad",
          "en": "city",
          "pos": "noun"
        },
        {
          "es": "universidad",
          "en": "university",
          "pos": "noun"
        },
        {
          "es": "acción",
          "en": "action",
          "pos": "noun"
        },
        {
          "es": "problema",
          "en": "problem",
          "pos": "noun"
        },
        {
          "es": "programa",
          "en": "program",
          "pos": "noun"
        },
        {
          "es": "día",
          "en": "day",
          "pos": "noun"
        },
        {
          "es": "agua",
          "en": "water",
          "pos": "noun"
        },
        {
          "es": "foto",
          "en": "photo",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "_____ libro está en la mesa.",
          "correct": "El",
          "distractor": "La",
          "explanation": "libro ends in -o → masculine → el."
        },
        {
          "sentence": "Voy a _____ piscina.",
          "correct": "la",
          "distractor": "el",
          "explanation": "piscina ends in -a → feminine → la."
        },
        {
          "sentence": "_____ problema es difícil.",
          "correct": "El",
          "distractor": "La",
          "explanation": "Greek-origin -ma noun → masculine: el problema."
        },
        {
          "sentence": "Tengo _____ libro nuevo.",
          "correct": "un",
          "distractor": "uno",
          "explanation": "Before a masculine noun use un, not uno."
        },
        {
          "sentence": "_____ ciudad es grande.",
          "correct": "La",
          "distractor": "El",
          "explanation": "Nouns ending in -d are usually feminine."
        },
        {
          "sentence": "Bebo _____ agua fría.",
          "correct": "el",
          "distractor": "la",
          "explanation": "agua takes el in the singular (stressed initial a-) even though it's feminine."
        },
        {
          "sentence": "Quiero ver _____ foto.",
          "correct": "la",
          "distractor": "el",
          "explanation": "foto is short for fotografía → feminine."
        }
      ],
      "caveats": null
    },
    {
      "chapter_id": "05",
      "slug": "the-verb-ser",
      "title": "The Verb Ser",
      "time_range_sec": [
        1134,
        1399
      ],
      "summary": "Ser is the irregular Spanish verb for 'to be' used for factual, identity-defining statements: name, nationality, occupation, physical traits, generalizations, event location/time, and time/date.",
      "suggested_grammar_note_id": "ser-vs-estar",
      "rules": [
        {
          "title": "When to use ser",
          "bullets": [
            "Name, nationality, place of origin (Yo soy Alex; Soy de España).",
            "Occupation (Él es profesor — no indefinite article).",
            "Physical traits considered factual (Tú eres bonito).",
            "Generalizations (Es importante trabajar).",
            "Where/when an event takes place (La fiesta es en el club; La fiesta es a las seis).",
            "Time and date (Es lunes; Son las dos de la tarde)."
          ]
        },
        {
          "title": "Telling time with ser",
          "bullets": [
            "Use es for 1 o'clock: Es la una.",
            "Use son for 2 o'clock and later: Son las dos / tres / cuatro.",
            "Always include la / las before the hour.",
            "Add de la mañana / tarde / noche to specify time of day."
          ]
        },
        {
          "title": "Mental model",
          "bullets": [
            "Ser = factual statements about identity.",
            "Schoolroom rule 'permanent = ser' works because permanent traits are factual.",
            "Compare with estar (Chapter 7) for conditions, location, and emotions."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo soy Alex.",
          "en": "I am Alex.",
          "tags": [
            "ser",
            "name"
          ]
        },
        {
          "es": "Yo soy español.",
          "en": "I am Spanish.",
          "tags": [
            "ser",
            "nationality"
          ]
        },
        {
          "es": "Yo soy de España.",
          "en": "I am from Spain.",
          "tags": [
            "ser",
            "origin"
          ]
        },
        {
          "es": "Él es profesor.",
          "en": "He is a professor.",
          "tags": [
            "ser",
            "occupation"
          ]
        },
        {
          "es": "Tú eres bonita.",
          "en": "You are beautiful.",
          "tags": [
            "ser",
            "trait"
          ]
        },
        {
          "es": "Es importante trabajar.",
          "en": "It is important to work.",
          "tags": [
            "ser",
            "generalization"
          ]
        },
        {
          "es": "La fiesta es en el club.",
          "en": "The party is in the club.",
          "tags": [
            "ser",
            "event-location"
          ]
        },
        {
          "es": "La fiesta es a las seis.",
          "en": "The party is at six.",
          "tags": [
            "ser",
            "event-time"
          ]
        },
        {
          "es": "Es viernes.",
          "en": "It is Friday.",
          "tags": [
            "ser",
            "date"
          ]
        },
        {
          "es": "Es la una de la tarde.",
          "en": "It is one in the afternoon.",
          "tags": [
            "ser",
            "time"
          ]
        },
        {
          "es": "Son las dos de la tarde.",
          "en": "It is two in the afternoon.",
          "tags": [
            "ser",
            "time"
          ]
        }
      ],
      "vocab": [
        {
          "es": "ser",
          "en": "to be / to exist",
          "pos": "verb"
        },
        {
          "es": "fiesta",
          "en": "party",
          "pos": "noun"
        },
        {
          "es": "profesor",
          "en": "professor / teacher",
          "pos": "noun"
        },
        {
          "es": "bonito/a",
          "en": "beautiful / pretty",
          "pos": "adjective"
        },
        {
          "es": "importante",
          "en": "important",
          "pos": "adjective"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "ser",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "soy",
            "tu": "eres",
            "el": "es",
            "nosotros": "somos",
            "vosotros": "sois",
            "ellos": "son"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ de México.",
          "correct": "soy",
          "distractor": "estoy",
          "explanation": "Place of origin uses ser."
        },
        {
          "sentence": "Ella _____ doctora.",
          "correct": "es",
          "distractor": "está",
          "explanation": "Occupation uses ser; no indefinite article needed."
        },
        {
          "sentence": "Nosotros _____ amigos.",
          "correct": "somos",
          "distractor": "estamos",
          "explanation": "Identity (we are friends) uses ser."
        },
        {
          "sentence": "_____ las tres de la tarde.",
          "correct": "Son",
          "distractor": "Es",
          "explanation": "Hours 2 and up are plural → son."
        },
        {
          "sentence": "_____ la una en punto.",
          "correct": "Es",
          "distractor": "Son",
          "explanation": "1 o'clock is singular → es la una."
        },
        {
          "sentence": "La fiesta _____ en mi casa.",
          "correct": "es",
          "distractor": "está",
          "explanation": "Where an event TAKES PLACE uses ser, not estar."
        },
        {
          "sentence": "Tú _____ muy alto.",
          "correct": "eres",
          "distractor": "estás",
          "explanation": "Physical trait → factual → ser."
        }
      ],
      "caveats": "Some on-screen OCR garbled the conjugation table (e.g., 'iNeres' for 'eres'); reconstructed from standard ser conjugation."
    },
    {
      "chapter_id": "06",
      "slug": "the-present-progressive",
      "title": "The Present Progressive",
      "time_range_sec": [
        1399,
        1568
      ],
      "summary": "Form the present progressive (an action happening right now) with conjugated estar + the gerund: -ando for -ar verbs, -iendo for -er/-ir verbs, with spelling and stem-change exceptions like leyendo, durmiendo, diciendo.",
      "suggested_grammar_note_id": "estar-gerund-progressive",
      "rules": [
        {
          "title": "Formula",
          "bullets": [
            "Conjugated estar + gerund of the action verb.",
            "estar agrees with the subject; the gerund never changes form."
          ]
        },
        {
          "title": "Building the gerund",
          "bullets": [
            "-ar → -ando (hablar → hablando).",
            "-er / -ir → -iendo (comer → comiendo; vivir → viviendo)."
          ]
        },
        {
          "title": "Spelling exception: vowel-stem verbs",
          "bullets": [
            "If the stem ends in a vowel, -iendo becomes -yendo to avoid 3 vowels in a row.",
            "leer → leyendo, traer → trayendo, oír → oyendo, construir → construyendo."
          ]
        },
        {
          "title": "Stem-changing -ir verbs",
          "bullets": [
            "o → u: dormir → durmiendo, morir → muriendo.",
            "e → i: decir → diciendo, pedir → pidiendo, sentir → sintiendo, servir → sirviendo."
          ]
        },
        {
          "title": "Usage scope",
          "bullets": [
            "Use only for actions in progress right now.",
            "Don't use for habitual or scheduled-future actions (use simple present instead)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo estoy hablando.",
          "en": "I am speaking.",
          "tags": [
            "progressive"
          ]
        },
        {
          "es": "Tú estás comiendo.",
          "en": "You are eating.",
          "tags": [
            "progressive"
          ]
        },
        {
          "es": "Él está viviendo en Madrid.",
          "en": "He is living in Madrid.",
          "tags": [
            "progressive"
          ]
        },
        {
          "es": "Estoy leyendo un libro.",
          "en": "I am reading a book.",
          "tags": [
            "progressive",
            "vowel-stem"
          ]
        },
        {
          "es": "Estamos durmiendo.",
          "en": "We are sleeping.",
          "tags": [
            "progressive",
            "stem-change"
          ]
        },
        {
          "es": "Ellos están diciendo la verdad.",
          "en": "They are telling the truth.",
          "tags": [
            "progressive",
            "stem-change"
          ]
        },
        {
          "es": "Nosotros estamos trabajando.",
          "en": "We are working.",
          "tags": [
            "progressive"
          ]
        },
        {
          "es": "Ella está pidiendo ayuda.",
          "en": "She is asking for help.",
          "tags": [
            "progressive",
            "stem-change"
          ]
        }
      ],
      "vocab": [
        {
          "es": "estar",
          "en": "to be (location/condition)",
          "pos": "verb"
        },
        {
          "es": "leer",
          "en": "to read",
          "pos": "verb"
        },
        {
          "es": "dormir",
          "en": "to sleep",
          "pos": "verb"
        },
        {
          "es": "decir",
          "en": "to say / to tell",
          "pos": "verb"
        },
        {
          "es": "pedir",
          "en": "to ask for / request",
          "pos": "verb"
        },
        {
          "es": "trabajar",
          "en": "to work",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "estar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "estoy",
            "tu": "estás",
            "el": "está",
            "nosotros": "estamos",
            "vosotros": "estáis",
            "ellos": "están"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo estoy _____ con mi amigo. (hablar)",
          "correct": "hablando",
          "distractor": "hablado",
          "explanation": "-ar verbs form the gerund with -ando."
        },
        {
          "sentence": "Ella está _____ pizza. (comer)",
          "correct": "comiendo",
          "distractor": "comendo",
          "explanation": "-er verbs form the gerund with -iendo."
        },
        {
          "sentence": "Estoy _____ un libro. (leer)",
          "correct": "leyendo",
          "distractor": "leiendo",
          "explanation": "Vowel-stem: i becomes y to avoid three vowels."
        },
        {
          "sentence": "Los niños están _____. (dormir)",
          "correct": "durmiendo",
          "distractor": "dormiendo",
          "explanation": "Stem-change o→u in the gerund of dormir."
        },
        {
          "sentence": "Él está _____ la verdad. (decir)",
          "correct": "diciendo",
          "distractor": "deciendo",
          "explanation": "Stem-change e→i in the gerund of decir."
        },
        {
          "sentence": "Nosotros _____ trabajando ahora.",
          "correct": "estamos",
          "distractor": "somos",
          "explanation": "Progressive uses estar (action right now), not ser."
        }
      ],
      "caveats": null
    },
    {
      "chapter_id": "07",
      "slug": "the-verb-estar",
      "title": "The Verb Estar",
      "time_range_sec": [
        1568,
        1948
      ],
      "summary": "Estar is the Spanish 'to be' for things happening right now: present progressive, location/spatial relationships, and conditions/emotions/health that change over time. Contrast with ser (factual identity).",
      "suggested_grammar_note_id": "ser-vs-estar",
      "rules": [
        {
          "title": "When to use estar",
          "bullets": [
            "Present progressive (Yo estoy hablando).",
            "Location and spatial relationships (Estoy en casa; Estoy al lado de la mesa).",
            "Health, conditions, and emotions that change over time (Estoy feliz; Estás ocupado; Las puertas están abiertas).",
            "Weather expressions like 'Está nublado'."
          ]
        },
        {
          "title": "Mental model: estar = right now",
          "bullets": [
            "Estar describes a current state likely to change.",
            "Ser describes factual identity that doesn't change.",
            "Él está alto = he's feeling/looking tall (rare); Él es alto = he's tall (normal)."
          ]
        },
        {
          "title": "Spelling traps",
          "bullets": [
            "estoy (I am) vs esto (this).",
            "estás (you are) vs estas (these).",
            "está (he/she is) vs esta (this, fem.).",
            "Always write the accents on estás / está / están."
          ]
        },
        {
          "title": "Estar with adjectives",
          "bullets": [
            "Emotions: feliz, triste, enojado, cansado, contento → estar.",
            "Conditions: ocupado, enfermo, abierto, cerrado, listo → estar.",
            "Physical traits: alto, bajo, guapo, joven, viejo → ser."
          ]
        }
      ],
      "examples": [
        {
          "es": "Él está corriendo.",
          "en": "He is running.",
          "tags": [
            "estar",
            "progressive"
          ]
        },
        {
          "es": "Tú estás pensando.",
          "en": "You are thinking.",
          "tags": [
            "estar",
            "progressive"
          ]
        },
        {
          "es": "¿Dónde estás?",
          "en": "Where are you?",
          "tags": [
            "estar",
            "location"
          ]
        },
        {
          "es": "Yo estoy en la casa.",
          "en": "I am in the house.",
          "tags": [
            "estar",
            "location"
          ]
        },
        {
          "es": "Yo estoy al lado de la casa.",
          "en": "I am next to the house.",
          "tags": [
            "estar",
            "location"
          ]
        },
        {
          "es": "Yo estoy bien.",
          "en": "I am good / fine.",
          "tags": [
            "estar",
            "condition"
          ]
        },
        {
          "es": "Tú estás ocupado.",
          "en": "You are busy.",
          "tags": [
            "estar",
            "condition"
          ]
        },
        {
          "es": "Las puertas están abiertas.",
          "en": "The doors are open.",
          "tags": [
            "estar",
            "condition"
          ]
        },
        {
          "es": "Yo estoy feliz.",
          "en": "I am happy (right now).",
          "tags": [
            "estar",
            "emotion"
          ]
        },
        {
          "es": "Está nublado.",
          "en": "It is cloudy.",
          "tags": [
            "estar",
            "weather"
          ]
        }
      ],
      "vocab": [
        {
          "es": "estar",
          "en": "to be (location / condition / progressive)",
          "pos": "verb"
        },
        {
          "es": "feliz",
          "en": "happy",
          "pos": "adjective"
        },
        {
          "es": "ocupado/a",
          "en": "busy",
          "pos": "adjective"
        },
        {
          "es": "abierto/a",
          "en": "open",
          "pos": "adjective"
        },
        {
          "es": "cerrado/a",
          "en": "closed",
          "pos": "adjective"
        },
        {
          "es": "cansado/a",
          "en": "tired",
          "pos": "adjective"
        },
        {
          "es": "enfermo/a",
          "en": "sick",
          "pos": "adjective"
        },
        {
          "es": "nublado",
          "en": "cloudy",
          "pos": "adjective"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "estar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "estoy",
            "tu": "estás",
            "el": "está",
            "nosotros": "estamos",
            "vosotros": "estáis",
            "ellos": "están"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ feliz hoy.",
          "correct": "estoy",
          "distractor": "soy",
          "explanation": "Emotion that changes over time → estar."
        },
        {
          "sentence": "¿Dónde _____ tú?",
          "correct": "estás",
          "distractor": "eres",
          "explanation": "Location → estar."
        },
        {
          "sentence": "Las puertas _____ abiertas.",
          "correct": "están",
          "distractor": "son",
          "explanation": "Current condition → estar."
        },
        {
          "sentence": "Él _____ alto.",
          "correct": "es",
          "distractor": "está",
          "explanation": "Physical trait → factual → ser."
        },
        {
          "sentence": "Nosotros _____ en el parque.",
          "correct": "estamos",
          "distractor": "somos",
          "explanation": "Location → estar."
        },
        {
          "sentence": "Tú _____ ocupado ahora.",
          "correct": "estás",
          "distractor": "eres",
          "explanation": "Temporary condition right now → estar."
        },
        {
          "sentence": "Hoy _____ nublado.",
          "correct": "está",
          "distractor": "es",
          "explanation": "Weather adjective → estar."
        }
      ],
      "caveats": "OCR slightly garbled spellings like 'corriendo' (rendered cleanly above)."
    },
    {
      "chapter_id": "08",
      "slug": "descriptive-adjectives",
      "title": "Descriptive Adjectives",
      "time_range_sec": [
        1948,
        2152
      ],
      "summary": "Spanish descriptive adjectives agree with their noun in gender and number, normally follow the noun, and pair with ser for permanent traits or estar for changing conditions.",
      "suggested_grammar_note_id": "adjective-placement",
      "rules": [
        {
          "title": "Gender and number agreement",
          "bullets": [
            "Adjectives ending in -o are masculine; -a are feminine; -e or consonants are neutral.",
            "Pluralize by adding -s after a vowel (bonito → bonitos) or -es after a consonant (fácil → fáciles).",
            "The adjective must agree with the subject/noun it describes."
          ]
        },
        {
          "title": "Word order",
          "bullets": [
            "Descriptive adjectives go AFTER the noun in Spanish: el chico inteligente.",
            "Putting the adjective before the noun (el inteligente chico) is generally incorrect."
          ]
        },
        {
          "title": "Ser vs estar with adjectives",
          "bullets": [
            "Use ser for factual/inherent traits: alto, bonito, inteligente, fácil.",
            "Use estar for conditions or emotions that change: cansado, triste, enfermo, relajado.",
            "Some adjectives work with either verb but change meaning (e.g., ser listo = clever; estar listo = ready)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo soy alto y bonito.",
          "en": "I am tall and handsome.",
          "tags": [
            "ser",
            "masculine"
          ]
        },
        {
          "es": "Yo soy alta y bonita.",
          "en": "I am tall and beautiful.",
          "tags": [
            "ser",
            "feminine"
          ]
        },
        {
          "es": "Ellos son feos.",
          "en": "They are ugly.",
          "tags": [
            "ser",
            "plural"
          ]
        },
        {
          "es": "Estas clases son fáciles.",
          "en": "These classes are easy.",
          "tags": [
            "plural",
            "neutral-ending"
          ]
        },
        {
          "es": "Nosotros somos inteligentes.",
          "en": "We are intelligent.",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "El chico inteligente.",
          "en": "The smart boy.",
          "tags": [
            "word-order"
          ]
        },
        {
          "es": "La lección difícil.",
          "en": "The difficult lesson.",
          "tags": [
            "word-order"
          ]
        },
        {
          "es": "Yo soy bajo.",
          "en": "I am short.",
          "tags": [
            "ser"
          ]
        },
        {
          "es": "Yo estoy cansado.",
          "en": "I am tired.",
          "tags": [
            "estar"
          ]
        },
        {
          "es": "La chica es hermosa.",
          "en": "The girl is beautiful.",
          "tags": [
            "ser"
          ]
        },
        {
          "es": "El hombre está relajado.",
          "en": "The man is relaxed.",
          "tags": [
            "estar"
          ]
        },
        {
          "es": "Él es inteligente.",
          "en": "He is smart.",
          "tags": [
            "ser"
          ]
        },
        {
          "es": "Nosotros estamos tristes.",
          "en": "We are sad.",
          "tags": [
            "estar",
            "plural"
          ]
        }
      ],
      "vocab": [
        {
          "es": "alto",
          "en": "tall",
          "pos": "adj"
        },
        {
          "es": "bajo",
          "en": "short",
          "pos": "adj"
        },
        {
          "es": "bonito",
          "en": "beautiful/handsome",
          "pos": "adj"
        },
        {
          "es": "feo",
          "en": "ugly",
          "pos": "adj"
        },
        {
          "es": "fácil",
          "en": "easy",
          "pos": "adj"
        },
        {
          "es": "difícil",
          "en": "difficult",
          "pos": "adj"
        },
        {
          "es": "importante",
          "en": "important",
          "pos": "adj"
        },
        {
          "es": "inteligente",
          "en": "intelligent",
          "pos": "adj"
        },
        {
          "es": "aburrido",
          "en": "bored",
          "pos": "adj"
        },
        {
          "es": "cansado",
          "en": "tired",
          "pos": "adj"
        },
        {
          "es": "enfermo",
          "en": "sick",
          "pos": "adj"
        },
        {
          "es": "listo",
          "en": "ready / clever",
          "pos": "adj"
        },
        {
          "es": "seguro",
          "en": "sure",
          "pos": "adj"
        },
        {
          "es": "preparado",
          "en": "prepared",
          "pos": "adj"
        },
        {
          "es": "relajado",
          "en": "relaxed",
          "pos": "adj"
        },
        {
          "es": "triste",
          "en": "sad",
          "pos": "adj"
        },
        {
          "es": "hermoso",
          "en": "beautiful",
          "pos": "adj"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "El chico _____ inteligente.",
          "correct": "es",
          "distractor": "está",
          "explanation": "Intelligence is a permanent trait → ser."
        },
        {
          "sentence": "Nosotros _____ cansados.",
          "correct": "estamos",
          "distractor": "somos",
          "explanation": "Tiredness is a changing condition → estar."
        },
        {
          "sentence": "Estas clases son _____.",
          "correct": "fáciles",
          "distractor": "fácil",
          "explanation": "Plural noun (clases) requires plural adjective."
        },
        {
          "sentence": "La _____ hermosa.",
          "correct": "chica",
          "distractor": "chico",
          "explanation": "Hermosa is feminine, so the noun must also be feminine."
        },
        {
          "sentence": "El hombre _____ relajado.",
          "correct": "está",
          "distractor": "es",
          "explanation": "Being relaxed is a temporary state → estar."
        },
        {
          "sentence": "Yo soy _____ (f).",
          "correct": "alta",
          "distractor": "alto",
          "explanation": "Feminine subject takes -a ending."
        },
        {
          "sentence": "El chico _____ (correct word order).",
          "correct": "inteligente",
          "distractor": "inteligente chico",
          "explanation": "Adjective follows the noun: el chico inteligente."
        }
      ],
      "caveats": "OCR garbled many adjective endings (e.g., 'AOS fos', 'esto'); cleaned using standard Spanish forms."
    },
    {
      "chapter_id": "09",
      "slug": "possessive-adjectives",
      "title": "Possessive Adjectives",
      "time_range_sec": [
        2152,
        2312
      ],
      "summary": "Spanish possessive adjectives precede the noun and agree in number; only nuestro and vuestro also agree in gender. The adjective su can mean his, her, its, or their, with context clarifying the owner.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Placement and agreement",
          "bullets": [
            "Possessive adjectives go before the noun: mi casa, tu perro.",
            "All possessives agree in number with the thing owned (mi → mis).",
            "Only nuestro and vuestro additionally agree in gender."
          ]
        },
        {
          "title": "Watch the accent",
          "bullets": [
            "mi (no accent) = my; mí (accented) = me (object pronoun).",
            "tu (no accent) = your; tú (accented) = you (subject pronoun)."
          ]
        },
        {
          "title": "su is ambiguous",
          "bullets": [
            "su can mean his, her, its, their, or formal your.",
            "Resolve by naming the owner: 'con John y su padre' makes clear it is 'his'."
          ]
        }
      ],
      "examples": [
        {
          "es": "Mi coche.",
          "en": "My car.",
          "tags": [
            "singular"
          ]
        },
        {
          "es": "Mis coches.",
          "en": "My cars.",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "Tu perro.",
          "en": "Your dog.",
          "tags": [
            "informal"
          ]
        },
        {
          "es": "Tus perros.",
          "en": "Your dogs.",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "Nuestro gato.",
          "en": "Our cat.",
          "tags": [
            "masculine"
          ]
        },
        {
          "es": "Nuestra rosa.",
          "en": "Our rose.",
          "tags": [
            "feminine"
          ]
        },
        {
          "es": "Vuestro gato.",
          "en": "Y'all's cat.",
          "tags": [
            "spain",
            "masculine"
          ]
        },
        {
          "es": "Vuestra rosa.",
          "en": "Y'all's rose.",
          "tags": [
            "spain",
            "feminine"
          ]
        },
        {
          "es": "Yo hablo con su amigo.",
          "en": "I talk with his/her/their friend.",
          "tags": [
            "ambiguous"
          ]
        },
        {
          "es": "Yo hablo con John y con su padre.",
          "en": "I talk with John and with his father.",
          "tags": [
            "disambiguated"
          ]
        },
        {
          "es": "Yo hablo con Emma y con su madre.",
          "en": "I talk with Emma and with her mother.",
          "tags": [
            "disambiguated"
          ]
        },
        {
          "es": "Yo hablo con mis padres y con sus amigos.",
          "en": "I talk with my parents and with their friends.",
          "tags": [
            "plural"
          ]
        }
      ],
      "vocab": [
        {
          "es": "mi / mis",
          "en": "my",
          "pos": "adj"
        },
        {
          "es": "tu / tus",
          "en": "your (informal sing.)",
          "pos": "adj"
        },
        {
          "es": "su / sus",
          "en": "his / her / its / their / your (formal)",
          "pos": "adj"
        },
        {
          "es": "nuestro / nuestra / nuestros / nuestras",
          "en": "our",
          "pos": "adj"
        },
        {
          "es": "vuestro / vuestra / vuestros / vuestras",
          "en": "y'all's",
          "pos": "adj"
        },
        {
          "es": "padre",
          "en": "father",
          "pos": "noun"
        },
        {
          "es": "madre",
          "en": "mother",
          "pos": "noun"
        },
        {
          "es": "amigo",
          "en": "friend",
          "pos": "noun"
        },
        {
          "es": "coche",
          "en": "car",
          "pos": "noun"
        },
        {
          "es": "perro",
          "en": "dog",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "_____ coches son rojos. (my)",
          "correct": "Mis",
          "distractor": "Mi",
          "explanation": "Plural noun (coches) requires plural possessive (mis)."
        },
        {
          "sentence": "_____ gato. (our, m.)",
          "correct": "Nuestro",
          "distractor": "Nuestra",
          "explanation": "Gato is masculine, so use nuestro."
        },
        {
          "sentence": "_____ rosa. (our, f.)",
          "correct": "Nuestra",
          "distractor": "Nuestro",
          "explanation": "Rosa is feminine → nuestra."
        },
        {
          "sentence": "Yo hablo con _____ amigo. (his)",
          "correct": "su",
          "distractor": "tu",
          "explanation": "su covers his/her/their; tu would mean 'your'."
        },
        {
          "sentence": "Yo hablo con mis padres y con _____ amigos. (their)",
          "correct": "sus",
          "distractor": "su",
          "explanation": "Amigos is plural, so use sus."
        },
        {
          "sentence": "_____ perro. (your, informal sing.)",
          "correct": "Tu",
          "distractor": "Tú",
          "explanation": "Tu (no accent) is the possessive; tú is the pronoun 'you'."
        }
      ],
      "caveats": "OCR rendered Spanish accents inconsistently (e.g., 'noest', 'vestro'); cleaned to standard nuestro/vuestro forms."
    },
    {
      "chapter_id": "10",
      "slug": "demonstrative-adjectives",
      "title": "Demonstrative Adjectives",
      "time_range_sec": [
        2312,
        2450
      ],
      "summary": "Spanish demonstratives (este/ese/aquel) precede the noun and agree in gender and number. Neuter forms (esto/eso/aquello) refer to unidentified or general ideas.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Three distances",
          "bullets": [
            "este/esta = this (near the speaker).",
            "ese/esa = that (near the listener).",
            "aquel/aquella = that one over there (far from both)."
          ]
        },
        {
          "title": "Agreement and pluralization",
          "bullets": [
            "Demonstratives agree in gender and number with the noun.",
            "Masculine plural changes vowel: este → estos, ese → esos, aquel → aquellos.",
            "Feminine plural simply adds -s: esta → estas, esa → esas."
          ]
        },
        {
          "title": "Neuter forms",
          "bullets": [
            "Use esto, eso, aquello when the thing has no known gender or for abstract ideas.",
            "Examples: ¿Qué es esto? / Esto es para todos."
          ]
        },
        {
          "title": "Don't accent esta/estas",
          "bullets": [
            "esta = this (f); está = he/she/it is.",
            "estas = these (f); estás = you are."
          ]
        }
      ],
      "examples": [
        {
          "es": "este libro",
          "en": "this book",
          "tags": [
            "masculine",
            "singular"
          ]
        },
        {
          "es": "esta casa",
          "en": "this house",
          "tags": [
            "feminine",
            "singular"
          ]
        },
        {
          "es": "ese curso",
          "en": "that course",
          "tags": [
            "masculine",
            "singular"
          ]
        },
        {
          "es": "esa mesa",
          "en": "that table",
          "tags": [
            "feminine",
            "singular"
          ]
        },
        {
          "es": "estos libros",
          "en": "these books",
          "tags": [
            "masculine",
            "plural"
          ]
        },
        {
          "es": "estas casas",
          "en": "these houses",
          "tags": [
            "feminine",
            "plural"
          ]
        },
        {
          "es": "esos cursos",
          "en": "those courses",
          "tags": [
            "masculine",
            "plural"
          ]
        },
        {
          "es": "esas mesas",
          "en": "those tables",
          "tags": [
            "feminine",
            "plural"
          ]
        },
        {
          "es": "¿Qué es esto?",
          "en": "What is this?",
          "tags": [
            "neuter"
          ]
        },
        {
          "es": "¿Qué es eso?",
          "en": "What is that?",
          "tags": [
            "neuter"
          ]
        },
        {
          "es": "Esto es para todos.",
          "en": "This is for everybody.",
          "tags": [
            "neuter",
            "general"
          ]
        },
        {
          "es": "Eso es para todos.",
          "en": "That is for everybody.",
          "tags": [
            "neuter",
            "general"
          ]
        },
        {
          "es": "aquel libro",
          "en": "that book (over there)",
          "tags": [
            "far"
          ]
        },
        {
          "es": "aquellas mesas",
          "en": "those tables (over there)",
          "tags": [
            "far",
            "plural"
          ]
        }
      ],
      "vocab": [
        {
          "es": "este / esta / estos / estas",
          "en": "this / these",
          "pos": "adj"
        },
        {
          "es": "ese / esa / esos / esas",
          "en": "that / those",
          "pos": "adj"
        },
        {
          "es": "aquel / aquella / aquellos / aquellas",
          "en": "that / those (over there)",
          "pos": "adj"
        },
        {
          "es": "esto / eso / aquello",
          "en": "this / that / that (neuter)",
          "pos": "adj"
        },
        {
          "es": "libro",
          "en": "book",
          "pos": "noun"
        },
        {
          "es": "casa",
          "en": "house",
          "pos": "noun"
        },
        {
          "es": "curso",
          "en": "course",
          "pos": "noun"
        },
        {
          "es": "mesa",
          "en": "table",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "_____ libro es interesante. (this)",
          "correct": "Este",
          "distractor": "Esta",
          "explanation": "Libro is masculine singular → este."
        },
        {
          "sentence": "_____ casas son grandes. (these)",
          "correct": "Estas",
          "distractor": "Estos",
          "explanation": "Casas is feminine plural → estas."
        },
        {
          "sentence": "_____ cursos son difíciles. (those)",
          "correct": "Esos",
          "distractor": "Eses",
          "explanation": "Masculine plural of ese is esos, not 'eses'."
        },
        {
          "sentence": "¿Qué es _____? (this — unknown)",
          "correct": "esto",
          "distractor": "este",
          "explanation": "Use neuter esto when the thing's gender is unknown."
        },
        {
          "sentence": "_____ es para todos. (that — general)",
          "correct": "Eso",
          "distractor": "Ese",
          "explanation": "General/abstract → neuter eso."
        },
        {
          "sentence": "_____ mesa (that, f sg).",
          "correct": "Esa",
          "distractor": "Esta",
          "explanation": "Mesa is feminine singular and 'that' (near listener) is esa."
        }
      ],
      "caveats": "OCR introduced 'AEL' / 'AOS' artifacts; cleaned to aquel/aquellos."
    },
    {
      "chapter_id": "11",
      "slug": "useful-greetings-farewells",
      "title": "Useful Greetings & Farewells",
      "time_range_sec": [
        2450,
        2633
      ],
      "summary": "A practical inventory of Spanish greetings, farewells, and polite phrases, with literal breakdowns explaining how each expression is built.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Greeting agreement",
          "bullets": [
            "buenos días (m. pl.) — día is masculine.",
            "buenas tardes / buenas noches (f. pl.) — tarde and noche are feminine.",
            "bienvenido(s) agrees in number with the people being welcomed."
          ]
        },
        {
          "title": "How are you uses estar",
          "bullets": [
            "¿Cómo estás? uses estar because well-being is temporary/changing.",
            "Reply with a conjugation of estar: (Yo) estoy bien."
          ]
        },
        {
          "title": "Hasta + time pattern",
          "bullets": [
            "hasta luego = until later.",
            "hasta pronto = until soon.",
            "hasta la vista = until the next time we see each other."
          ]
        }
      ],
      "examples": [
        {
          "es": "Hola.",
          "en": "Hi / Hello.",
          "tags": [
            "greeting"
          ]
        },
        {
          "es": "Bienvenido / Bienvenidos.",
          "en": "Welcome.",
          "tags": [
            "greeting"
          ]
        },
        {
          "es": "Buenos días.",
          "en": "Good morning.",
          "tags": [
            "greeting"
          ]
        },
        {
          "es": "Buenas noches.",
          "en": "Good night / Good evening.",
          "tags": [
            "greeting"
          ]
        },
        {
          "es": "¿Qué pasa?",
          "en": "What's going on?",
          "tags": [
            "question"
          ]
        },
        {
          "es": "¿Qué está pasando?",
          "en": "What's happening?",
          "tags": [
            "progressive"
          ]
        },
        {
          "es": "¿Qué tal?",
          "en": "How are you?",
          "tags": [
            "informal"
          ]
        },
        {
          "es": "¿Cómo estás (tú)?",
          "en": "How are you?",
          "tags": [
            "estar"
          ]
        },
        {
          "es": "(Yo) estoy bien.",
          "en": "I'm well.",
          "tags": [
            "estar"
          ]
        },
        {
          "es": "Por favor.",
          "en": "Please.",
          "tags": [
            "polite"
          ]
        },
        {
          "es": "(Muchas) Gracias.",
          "en": "Thank you (very much).",
          "tags": [
            "polite"
          ]
        },
        {
          "es": "De nada.",
          "en": "You're welcome.",
          "tags": [
            "polite"
          ]
        },
        {
          "es": "Perdón.",
          "en": "Sorry.",
          "tags": [
            "polite"
          ]
        },
        {
          "es": "Adiós.",
          "en": "Goodbye.",
          "tags": [
            "farewell"
          ]
        },
        {
          "es": "Hasta luego.",
          "en": "See you later.",
          "tags": [
            "farewell"
          ]
        },
        {
          "es": "Hasta pronto.",
          "en": "See you soon.",
          "tags": [
            "farewell"
          ]
        },
        {
          "es": "Hasta la vista.",
          "en": "See you later / Until next time.",
          "tags": [
            "farewell"
          ]
        }
      ],
      "vocab": [
        {
          "es": "hola",
          "en": "hi / hello",
          "pos": "phrase"
        },
        {
          "es": "bienvenido",
          "en": "welcome",
          "pos": "adj"
        },
        {
          "es": "buenos días",
          "en": "good morning",
          "pos": "phrase"
        },
        {
          "es": "buenas tardes",
          "en": "good afternoon",
          "pos": "phrase"
        },
        {
          "es": "buenas noches",
          "en": "good night / good evening",
          "pos": "phrase"
        },
        {
          "es": "pasar",
          "en": "to happen / to pass",
          "pos": "verb"
        },
        {
          "es": "¿qué pasa?",
          "en": "what's going on?",
          "pos": "phrase"
        },
        {
          "es": "¿qué tal?",
          "en": "how's it going?",
          "pos": "phrase"
        },
        {
          "es": "¿cómo estás?",
          "en": "how are you?",
          "pos": "phrase"
        },
        {
          "es": "por favor",
          "en": "please",
          "pos": "phrase"
        },
        {
          "es": "gracias",
          "en": "thanks",
          "pos": "phrase"
        },
        {
          "es": "de nada",
          "en": "you're welcome",
          "pos": "phrase"
        },
        {
          "es": "perdón",
          "en": "sorry",
          "pos": "phrase"
        },
        {
          "es": "adiós",
          "en": "goodbye",
          "pos": "phrase"
        },
        {
          "es": "chau / chao",
          "en": "bye",
          "pos": "phrase"
        },
        {
          "es": "hasta luego",
          "en": "see you later",
          "pos": "phrase"
        },
        {
          "es": "hasta pronto",
          "en": "see you soon",
          "pos": "phrase"
        },
        {
          "es": "hasta la vista",
          "en": "until next time",
          "pos": "phrase"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "¿Cómo _____ tú?",
          "correct": "estás",
          "distractor": "eres",
          "explanation": "Well-being is temporary, so use estar."
        },
        {
          "sentence": "(Yo) _____ bien.",
          "correct": "estoy",
          "distractor": "soy",
          "explanation": "Reply matches the verb in the question (estar)."
        },
        {
          "sentence": "_____ días. (good morning)",
          "correct": "Buenos",
          "distractor": "Buenas",
          "explanation": "Día is masculine, so the plural adjective is buenos."
        },
        {
          "sentence": "_____ noches. (good night)",
          "correct": "Buenas",
          "distractor": "Buenos",
          "explanation": "Noche is feminine → buenas."
        },
        {
          "sentence": "Thanks → 'Muchas _____'.",
          "correct": "gracias",
          "distractor": "perdón",
          "explanation": "Gracias = thanks; perdón = sorry."
        },
        {
          "sentence": "Reply to gracias: '_____ nada'.",
          "correct": "De",
          "distractor": "Por",
          "explanation": "'De nada' literally 'of nothing' = you're welcome."
        }
      ],
      "caveats": "OCR mangled accents (e.g., 'éQueé', 'C6mo'); cleaned to standard ¿Qué? and ¿Cómo?."
    },
    {
      "chapter_id": "12",
      "slug": "the-verb-poder",
      "title": "The Verb \"Poder\"",
      "time_range_sec": [
        2633,
        2823
      ],
      "summary": "Poder ('to be able to / can') is a stem-changing verb (o → ue) in the boot forms. It pairs directly with an infinitive — no preposition — to express ability.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Stem change o → ue",
          "bullets": [
            "yo, tú, él, ellos forms change the stem to pue- (the 'boot').",
            "nosotros and vosotros keep the regular stem (podemos, podéis).",
            "Endings follow the regular -er pattern."
          ]
        },
        {
          "title": "poder + infinitive",
          "bullets": [
            "Always follow poder directly with an infinitive: puedo hablar, puedes aprender.",
            "No preposition (a, de, que) is needed between poder and the infinitive."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo puedo hablar español.",
          "en": "I can speak Spanish.",
          "tags": [
            "+infinitive"
          ]
        },
        {
          "es": "Tú puedes aprender inglés.",
          "en": "You can learn English.",
          "tags": [
            "+infinitive"
          ]
        },
        {
          "es": "Él puede ayudar.",
          "en": "He can help.",
          "tags": [
            "+infinitive"
          ]
        },
        {
          "es": "Nosotros podemos ir.",
          "en": "We can go.",
          "tags": [
            "nosotros"
          ]
        },
        {
          "es": "Ellos pueden llamar por teléfono.",
          "en": "They can call by phone.",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "¿Puedes ayudarme?",
          "en": "Can you help me?",
          "tags": [
            "question"
          ]
        },
        {
          "es": "No puedo dormir.",
          "en": "I can't sleep.",
          "tags": [
            "negative"
          ]
        },
        {
          "es": "¿Podemos entrar?",
          "en": "Can we come in?",
          "tags": [
            "question"
          ]
        }
      ],
      "vocab": [
        {
          "es": "poder",
          "en": "to be able to / can",
          "pos": "verb"
        },
        {
          "es": "hablar",
          "en": "to speak",
          "pos": "verb"
        },
        {
          "es": "aprender",
          "en": "to learn",
          "pos": "verb"
        },
        {
          "es": "ayudar",
          "en": "to help",
          "pos": "verb"
        },
        {
          "es": "llamar",
          "en": "to call",
          "pos": "verb"
        },
        {
          "es": "teléfono",
          "en": "phone",
          "pos": "noun"
        },
        {
          "es": "español",
          "en": "Spanish (language)",
          "pos": "noun"
        },
        {
          "es": "inglés",
          "en": "English (language)",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "poder",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "puedo",
            "tu": "puedes",
            "el": "puede",
            "nosotros": "podemos",
            "vosotros": "podéis",
            "ellos": "pueden"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ hablar español.",
          "correct": "puedo",
          "distractor": "podo",
          "explanation": "Stem change o→ue in yo form: puedo."
        },
        {
          "sentence": "Nosotros _____ ir mañana.",
          "correct": "podemos",
          "distractor": "puedemos",
          "explanation": "Nosotros keeps the regular stem: podemos."
        },
        {
          "sentence": "Ellos _____ llamar por teléfono.",
          "correct": "pueden",
          "distractor": "poden",
          "explanation": "Ellos is in the 'boot' → stem change: pueden."
        },
        {
          "sentence": "¿Tú _____ ayudarme?",
          "correct": "puedes",
          "distractor": "podes",
          "explanation": "Tú is in the 'boot' → puedes."
        },
        {
          "sentence": "Yo puedo _____ español. (speak)",
          "correct": "hablar",
          "distractor": "hablo",
          "explanation": "After poder use the infinitive, not a conjugated form."
        },
        {
          "sentence": "Vosotros _____ entrar.",
          "correct": "podéis",
          "distractor": "puedéis",
          "explanation": "Vosotros stays regular: podéis."
        }
      ],
      "caveats": "OCR rendered conjugations as 'PUO', 'pues', etc.; restored standard forms puedo/puedes/puede/podemos/podéis/pueden."
    },
    {
      "chapter_id": "13",
      "slug": "the-verb-ir",
      "title": "The Verb \"Ir\"",
      "time_range_sec": [
        2823,
        3158
      ],
      "summary": "Ir ('to go') is irregular and monosyllabic, with a v- stem in the present. It uses the preposition a for destinations and near-future actions (ir + a + infinitive).",
      "suggested_grammar_note_id": "future-vs-ir-a",
      "rules": [
        {
          "title": "Irregular monosyllabic verb",
          "bullets": [
            "ir cannot be conjugated by dropping an ending; its present forms use v-.",
            "Spanish doesn't form a progressive for ir — voy means both 'I go' and 'I am going'."
          ]
        },
        {
          "title": "Use a for destinations and near-future",
          "bullets": [
            "ir + a + place: Yo voy a la tienda.",
            "ir + a + infinitive: Yo voy a hacer mi tarea (near future, 'I'm going to do').",
            "Without a destination, drop a: Yo voy allí, Yo voy con mis amigos."
          ]
        },
        {
          "title": "a + el contracts to al",
          "bullets": [
            "a + el → al: Voy al cine, never 'a el cine'.",
            "a + la / a + los / a + las do NOT contract."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo voy.",
          "en": "I go / I am going.",
          "tags": [
            "present"
          ]
        },
        {
          "es": "Yo voy allí.",
          "en": "I go there.",
          "tags": [
            "no-a"
          ]
        },
        {
          "es": "Yo voy con mis amigos.",
          "en": "I'm going with my friends.",
          "tags": [
            "no-a"
          ]
        },
        {
          "es": "Yo voy a la tienda.",
          "en": "I'm going to the store.",
          "tags": [
            "destination"
          ]
        },
        {
          "es": "Yo voy a la clase.",
          "en": "I'm going to the class.",
          "tags": [
            "destination"
          ]
        },
        {
          "es": "Yo voy a hacer mi tarea.",
          "en": "I'm going to do my homework.",
          "tags": [
            "near-future"
          ]
        },
        {
          "es": "Yo voy a leer este libro.",
          "en": "I'm going to read this book.",
          "tags": [
            "near-future"
          ]
        },
        {
          "es": "Tú vas a trabajar.",
          "en": "You're going to work.",
          "tags": [
            "near-future"
          ]
        },
        {
          "es": "Él va a mi casa.",
          "en": "He goes to my house.",
          "tags": [
            "destination"
          ]
        },
        {
          "es": "Nosotros vamos allí con todos.",
          "en": "We go there with everybody.",
          "tags": [
            "no-a"
          ]
        },
        {
          "es": "Ellos van a la universidad.",
          "en": "They're going to the university.",
          "tags": [
            "destination"
          ]
        }
      ],
      "vocab": [
        {
          "es": "ir",
          "en": "to go",
          "pos": "verb"
        },
        {
          "es": "a",
          "en": "to",
          "pos": "phrase"
        },
        {
          "es": "tienda",
          "en": "store",
          "pos": "noun"
        },
        {
          "es": "clase",
          "en": "class",
          "pos": "noun"
        },
        {
          "es": "casa",
          "en": "house",
          "pos": "noun"
        },
        {
          "es": "universidad",
          "en": "university",
          "pos": "noun"
        },
        {
          "es": "tarea",
          "en": "homework",
          "pos": "noun"
        },
        {
          "es": "trabajar",
          "en": "to work",
          "pos": "verb"
        },
        {
          "es": "hacer",
          "en": "to do / to make",
          "pos": "verb"
        },
        {
          "es": "leer",
          "en": "to read",
          "pos": "verb"
        },
        {
          "es": "allí",
          "en": "there",
          "pos": "adv"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "ir",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "voy",
            "tu": "vas",
            "el": "va",
            "nosotros": "vamos",
            "vosotros": "vais",
            "ellos": "van"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ a la tienda.",
          "correct": "voy",
          "distractor": "vas",
          "explanation": "Yo form of ir is voy."
        },
        {
          "sentence": "Nosotros _____ a la universidad.",
          "correct": "vamos",
          "distractor": "van",
          "explanation": "Nosotros form of ir is vamos."
        },
        {
          "sentence": "Ellos _____ a trabajar.",
          "correct": "van",
          "distractor": "va",
          "explanation": "Ellos form is van."
        },
        {
          "sentence": "Yo voy _____ hacer mi tarea.",
          "correct": "a",
          "distractor": "que",
          "explanation": "ir uses preposition a before an infinitive (near-future)."
        },
        {
          "sentence": "Voy _____ cine. (a + el)",
          "correct": "al",
          "distractor": "a el",
          "explanation": "a + el always contracts to al."
        },
        {
          "sentence": "Tú _____ a la clase.",
          "correct": "vas",
          "distractor": "va",
          "explanation": "Tú form of ir is vas."
        },
        {
          "sentence": "I'm going with my friends → Yo voy _____ mis amigos.",
          "correct": "con",
          "distractor": "a",
          "explanation": "No destination, so use con (with), not a."
        }
      ],
      "caveats": "OCR scrambled many forms ('vais' → 'ypaarresivalg', etc.); restored standard ir conjugation."
    },
    {
      "chapter_id": "14",
      "slug": "the-verb-tener",
      "title": "The Verb \"Tener\"",
      "time_range_sec": [
        3158,
        3543
      ],
      "summary": "Tener ('to have') is stem-changing (e → ie) with an irregular yo form (tengo). It expresses possession, obligation (tener que + infinitive), and many 'I am ___' expressions where English uses 'to be'.",
      "suggested_grammar_note_id": "tener-expressions",
      "rules": [
        {
          "title": "Conjugation pattern",
          "bullets": [
            "Stem change e → ie in the boot: tienes, tiene, tienen.",
            "yo form is irregular: tengo (not 'tieno').",
            "nosotros and vosotros keep the regular stem: tenemos, tenéis."
          ]
        },
        {
          "title": "tener que + infinitive",
          "bullets": [
            "Obligation: tener + que + infinitive (Yo tengo que salir = I have to leave).",
            "Use que (NOT a) — common mistake. Compare ir + a + infinitive."
          ]
        },
        {
          "title": "tener expressions for being",
          "bullets": [
            "Spanish uses tener (not ser/estar) for: age, hunger, thirst, cold, heat, fear, luck, care.",
            "Tengo 19 años, tengo hambre, tengo frío, tengo calor, tengo miedo, tengo sed, tengo suerte, tengo cuidado.",
            "Intensify with mucho/a (adjective), not muy: tengo mucha hambre, NOT muy hambre."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo tengo un perro.",
          "en": "I have a dog.",
          "tags": [
            "possession"
          ]
        },
        {
          "es": "Tú tienes que pagar.",
          "en": "You have to pay.",
          "tags": [
            "tener-que"
          ]
        },
        {
          "es": "Él tiene un gato.",
          "en": "He has a cat.",
          "tags": [
            "possession"
          ]
        },
        {
          "es": "Nosotros tenemos una clase mañana.",
          "en": "We have a class tomorrow.",
          "tags": [
            "possession"
          ]
        },
        {
          "es": "Ellos tienen que leer los libros.",
          "en": "They have to read the books.",
          "tags": [
            "tener-que"
          ]
        },
        {
          "es": "Yo tengo que salir.",
          "en": "I have to leave.",
          "tags": [
            "tener-que"
          ]
        },
        {
          "es": "Yo tengo que hacer mi tarea.",
          "en": "I have to do my homework.",
          "tags": [
            "tener-que"
          ]
        },
        {
          "es": "Yo tengo 19 años.",
          "en": "I am 19 years old.",
          "tags": [
            "tener-expression",
            "age"
          ]
        },
        {
          "es": "Yo tengo frío.",
          "en": "I am cold.",
          "tags": [
            "tener-expression"
          ]
        },
        {
          "es": "Yo tengo calor.",
          "en": "I am hot.",
          "tags": [
            "tener-expression"
          ]
        },
        {
          "es": "Yo tengo hambre.",
          "en": "I am hungry.",
          "tags": [
            "tener-expression"
          ]
        },
        {
          "es": "Yo tengo sed.",
          "en": "I am thirsty.",
          "tags": [
            "tener-expression"
          ]
        },
        {
          "es": "Yo tengo miedo.",
          "en": "I am afraid.",
          "tags": [
            "tener-expression"
          ]
        },
        {
          "es": "Yo tengo cuidado.",
          "en": "I am careful.",
          "tags": [
            "tener-expression"
          ]
        },
        {
          "es": "Yo tengo suerte.",
          "en": "I am lucky.",
          "tags": [
            "tener-expression"
          ]
        }
      ],
      "vocab": [
        {
          "es": "tener",
          "en": "to have",
          "pos": "verb"
        },
        {
          "es": "tener que",
          "en": "to have to",
          "pos": "phrase"
        },
        {
          "es": "salir",
          "en": "to leave",
          "pos": "verb"
        },
        {
          "es": "pagar",
          "en": "to pay",
          "pos": "verb"
        },
        {
          "es": "gato",
          "en": "cat",
          "pos": "noun"
        },
        {
          "es": "perro",
          "en": "dog",
          "pos": "noun"
        },
        {
          "es": "clase",
          "en": "class",
          "pos": "noun"
        },
        {
          "es": "mañana",
          "en": "tomorrow / morning",
          "pos": "noun"
        },
        {
          "es": "frío",
          "en": "cold",
          "pos": "noun"
        },
        {
          "es": "calor",
          "en": "heat",
          "pos": "noun"
        },
        {
          "es": "hambre",
          "en": "hunger",
          "pos": "noun"
        },
        {
          "es": "sed",
          "en": "thirst",
          "pos": "noun"
        },
        {
          "es": "miedo",
          "en": "fear",
          "pos": "noun"
        },
        {
          "es": "cuidado",
          "en": "care / caution",
          "pos": "noun"
        },
        {
          "es": "suerte",
          "en": "luck",
          "pos": "noun"
        },
        {
          "es": "años",
          "en": "years",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "tener",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "tengo",
            "tu": "tienes",
            "el": "tiene",
            "nosotros": "tenemos",
            "vosotros": "tenéis",
            "ellos": "tienen"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ un perro.",
          "correct": "tengo",
          "distractor": "tieno",
          "explanation": "yo form of tener is irregular: tengo."
        },
        {
          "sentence": "Tú _____ que pagar.",
          "correct": "tienes",
          "distractor": "tenes",
          "explanation": "Stem change e→ie in tú: tienes."
        },
        {
          "sentence": "Nosotros _____ una clase mañana.",
          "correct": "tenemos",
          "distractor": "tienemos",
          "explanation": "Nosotros keeps the regular stem: tenemos."
        },
        {
          "sentence": "Yo tengo _____ salir. (have to)",
          "correct": "que",
          "distractor": "a",
          "explanation": "tener uses que (not a) before an infinitive."
        },
        {
          "sentence": "Ellos _____ que leer los libros.",
          "correct": "tienen",
          "distractor": "tenen",
          "explanation": "Ellos is in the boot: tienen."
        },
        {
          "sentence": "I'm hungry → Yo _____ hambre.",
          "correct": "tengo",
          "distractor": "estoy",
          "explanation": "Spanish uses tener for hunger; estar is wrong here."
        },
        {
          "sentence": "I'm 19 → Yo tengo 19 _____.",
          "correct": "años",
          "distractor": "soy",
          "explanation": "Age is expressed as 'tengo X años'."
        },
        {
          "sentence": "I'm very hungry → Tengo _____ hambre.",
          "correct": "mucha",
          "distractor": "muy",
          "explanation": "Use mucha/o (adjective) to intensify a tener expression, not muy."
        }
      ],
      "caveats": "OCR misrendered many forms ('Tango', 'tieno', 'T' alone); restored standard tengo/tienes/tiene/tenemos/tenéis/tienen and tener-que pattern."
    },
    {
      "chapter_id": "15",
      "slug": "al-del",
      "title": "al & del",
      "time_range_sec": [
        3543,
        3634
      ],
      "summary": "Spanish contracts a + el into al and de + el into del to eliminate the redundant vowel sound; these are the only two mandatory contractions in Spanish.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Mandatory contractions",
          "bullets": [
            "a + el becomes al ('to the' masculine singular).",
            "de + el becomes del ('of/from the' masculine singular).",
            "Both contractions are required, not optional."
          ]
        },
        {
          "title": "When NOT to contract",
          "bullets": [
            "Never contract with la, los, or las.",
            "Never contract with the pronoun él (he/him) - it keeps the accent and stays separate.",
            "Do not contract with proper nouns that capitalize El (e.g., El Salvador)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo quiero ir al baño.",
          "en": "I want to go to the bathroom.",
          "tags": [
            "al"
          ]
        },
        {
          "es": "Yo quiero ir a la clase.",
          "en": "I want to go to the class.",
          "tags": [
            "no-contraction"
          ]
        },
        {
          "es": "Él es del mercado.",
          "en": "He is from the market.",
          "tags": [
            "del"
          ]
        },
        {
          "es": "Él es de la clase.",
          "en": "He is from the class.",
          "tags": [
            "no-contraction"
          ]
        },
        {
          "es": "¿Qué supones del mercado?",
          "en": "What do you suppose of the market?",
          "tags": [
            "del",
            "question"
          ]
        },
        {
          "es": "Vamos al parque.",
          "en": "Let's go to the park.",
          "tags": [
            "al"
          ]
        },
        {
          "es": "Vengo del trabajo.",
          "en": "I come from work.",
          "tags": [
            "del"
          ]
        },
        {
          "es": "Es el libro del profesor.",
          "en": "It's the teacher's book.",
          "tags": [
            "del",
            "possession"
          ]
        },
        {
          "es": "Voy a El Salvador.",
          "en": "I'm going to El Salvador.",
          "tags": [
            "proper-noun"
          ]
        },
        {
          "es": "El regalo es de él.",
          "en": "The gift is from him.",
          "tags": [
            "pronoun-él"
          ]
        }
      ],
      "vocab": [
        {
          "es": "al",
          "en": "to the (m.)",
          "pos": "phrase"
        },
        {
          "es": "del",
          "en": "of/from the (m.)",
          "pos": "phrase"
        },
        {
          "es": "baño",
          "en": "bathroom",
          "pos": "noun"
        },
        {
          "es": "mercado",
          "en": "market",
          "pos": "noun"
        },
        {
          "es": "trabajo",
          "en": "work/job",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Yo voy _____ baño.",
          "correct": "al",
          "distractor": "a el",
          "explanation": "a + el always contracts to al."
        },
        {
          "sentence": "Vengo _____ mercado.",
          "correct": "del",
          "distractor": "de el",
          "explanation": "de + el always contracts to del."
        },
        {
          "sentence": "Quiero ir _____ clase.",
          "correct": "a la",
          "distractor": "al",
          "explanation": "Feminine la does not contract."
        },
        {
          "sentence": "Es el regalo _____ profesor.",
          "correct": "del",
          "distractor": "de la",
          "explanation": "Profesor is masculine, so de + el = del."
        },
        {
          "sentence": "El libro es _____ él.",
          "correct": "de",
          "distractor": "del",
          "explanation": "The pronoun él (with accent) does not contract; only the article el does."
        },
        {
          "sentence": "Vamos _____ playa.",
          "correct": "a la",
          "distractor": "al",
          "explanation": "Playa is feminine; no contraction."
        },
        {
          "sentence": "El presidente _____ Salvador habló.",
          "correct": "de El",
          "distractor": "del",
          "explanation": "Proper nouns with capital El don't contract."
        }
      ],
      "caveats": "Source clean text contained OCR garbling like 'ael', 'deel', 'Bo' (baño); reconstructed from context."
    },
    {
      "chapter_id": "16",
      "slug": "prepositional-pronouns",
      "title": "Prepositional Pronouns",
      "time_range_sec": [
        3634,
        3806
      ],
      "summary": "Prepositional pronouns follow prepositions; only yo and tú change (to mí and ti), and con combines into conmigo and contigo.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Forms",
          "bullets": [
            "yo → mí (with accent), tú → ti (no accent).",
            "All other pronouns (él, ella, nosotros/as, vosotros/as, ellos/as) keep their subject form.",
            "Used after prepositions like de, en, a, para, por, sobre, sin, hacia."
          ]
        },
        {
          "title": "Special forms with con",
          "bullets": [
            "con + mí → conmigo.",
            "con + ti → contigo.",
            "All other pronouns stay normal: con él, con nosotros, con ellos, etc."
          ]
        },
        {
          "title": "Exceptions",
          "bullets": [
            "After entre, según, excepto, menos, incluso, salvo, use yo and tú (not mí/ti).",
            "de él (from him) is not contracted to del; only the article el contracts."
          ]
        }
      ],
      "examples": [
        {
          "es": "Esto es para mí.",
          "en": "This is for me.",
          "tags": [
            "mí"
          ]
        },
        {
          "es": "Esto es para nosotros.",
          "en": "This is for us.",
          "tags": [
            "nosotros"
          ]
        },
        {
          "es": "La vida es fácil para ella.",
          "en": "Life is easy for her.",
          "tags": [
            "ella"
          ]
        },
        {
          "es": "Tú puedes ir con nosotros.",
          "en": "You can go with us.",
          "tags": [
            "con"
          ]
        },
        {
          "es": "Este regalo es de él.",
          "en": "This gift is from him.",
          "tags": [
            "de él"
          ]
        },
        {
          "es": "Ellos van con ellos.",
          "en": "They go with them.",
          "tags": [
            "con",
            "ellos"
          ]
        },
        {
          "es": "¿Quieres ir conmigo?",
          "en": "Do you want to go with me?",
          "tags": [
            "conmigo"
          ]
        },
        {
          "es": "Sí, quiero ir contigo.",
          "en": "Yes, I want to go with you.",
          "tags": [
            "contigo"
          ]
        },
        {
          "es": "Entre tú y yo, no hay secretos.",
          "en": "Between you and me, there are no secrets.",
          "tags": [
            "exception",
            "entre"
          ]
        },
        {
          "es": "Según tú, esto es fácil.",
          "en": "According to you, this is easy.",
          "tags": [
            "exception",
            "según"
          ]
        }
      ],
      "vocab": [
        {
          "es": "mí",
          "en": "me (after preposition)",
          "pos": "phrase"
        },
        {
          "es": "ti",
          "en": "you (after preposition)",
          "pos": "phrase"
        },
        {
          "es": "conmigo",
          "en": "with me",
          "pos": "phrase"
        },
        {
          "es": "contigo",
          "en": "with you",
          "pos": "phrase"
        },
        {
          "es": "para",
          "en": "for",
          "pos": "phrase"
        },
        {
          "es": "con",
          "en": "with",
          "pos": "phrase"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Este regalo es para _____.",
          "correct": "mí",
          "distractor": "yo",
          "explanation": "After preposition 'para', use mí, not yo."
        },
        {
          "sentence": "¿Quieres ir _____?",
          "correct": "conmigo",
          "distractor": "con mí",
          "explanation": "con + mí combines into conmigo."
        },
        {
          "sentence": "Sí, voy _____.",
          "correct": "contigo",
          "distractor": "con ti",
          "explanation": "con + ti combines into contigo."
        },
        {
          "sentence": "El libro es de _____.",
          "correct": "él",
          "distractor": "lo",
          "explanation": "After de, use the prepositional pronoun él (with accent)."
        },
        {
          "sentence": "Esto es para _____.",
          "correct": "nosotros",
          "distractor": "nos",
          "explanation": "After 'para', use the prepositional pronoun nosotros."
        },
        {
          "sentence": "Entre tú y _____, no hay problema.",
          "correct": "yo",
          "distractor": "mí",
          "explanation": "After 'entre', Spanish uses subject pronouns yo and tú."
        },
        {
          "sentence": "Ella va _____.",
          "correct": "con ellos",
          "distractor": "conellos",
          "explanation": "Only mí and ti combine with con; con ellos stays separate."
        }
      ],
      "caveats": "Source clean text contained heavy OCR errors ('AOS', 'noos', 'kigo'); reconstructed from Spanish grammar."
    },
    {
      "chapter_id": "17",
      "slug": "direct-object-pronouns",
      "title": "Direct Object Pronouns",
      "time_range_sec": [
        3806,
        4158
      ],
      "summary": "Direct object pronouns (me, te, lo, la, nos, os, los, las) replace the direct object noun and go before a conjugated verb or attach to an infinitive or gerund.",
      "suggested_grammar_note_id": "object-pronouns",
      "rules": [
        {
          "title": "Forms and agreement",
          "bullets": [
            "me, te, lo/la, nos, os, los/las.",
            "lo/la/los/las agree in gender and number with the noun replaced.",
            "lo also serves as a neuter 'it' referring to an idea or clause."
          ]
        },
        {
          "title": "Placement",
          "bullets": [
            "Before a conjugated verb: Yo lo compro.",
            "Attached to the end of an infinitive: voy a comprarlo.",
            "Attached to the end of a gerund (with written accent): estoy comprándolo.",
            "Cannot be attached to a finite (conjugated) verb."
          ]
        },
        {
          "title": "Personal a",
          "bullets": [
            "When the direct object is a specific person, precede it with personal a: Ella mira a Juan.",
            "The personal a does not change the pronoun choice: Ella lo mira."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo lo compro.",
          "en": "I buy it.",
          "tags": [
            "lo"
          ]
        },
        {
          "es": "Los quiero.",
          "en": "I want them (m).",
          "tags": [
            "los"
          ]
        },
        {
          "es": "Ellos la tienen.",
          "en": "They have it (f).",
          "tags": [
            "la"
          ]
        },
        {
          "es": "Yo te amo.",
          "en": "I love you.",
          "tags": [
            "te"
          ]
        },
        {
          "es": "Tú nos miras.",
          "en": "You watch us.",
          "tags": [
            "nos"
          ]
        },
        {
          "es": "Ella lo mira.",
          "en": "She watches him.",
          "tags": [
            "lo",
            "personal-a"
          ]
        },
        {
          "es": "Yo puedo verte.",
          "en": "I can see you.",
          "tags": [
            "infinitive"
          ]
        },
        {
          "es": "Ellos quieren comprarlos.",
          "en": "They want to buy them.",
          "tags": [
            "infinitive",
            "los"
          ]
        },
        {
          "es": "Voy a leerlo.",
          "en": "I'm going to read it.",
          "tags": [
            "ir-a"
          ]
        },
        {
          "es": "Estás mirándome.",
          "en": "You are watching me.",
          "tags": [
            "gerund",
            "accent"
          ]
        },
        {
          "es": "Ellos están leyéndolo.",
          "en": "They are reading it.",
          "tags": [
            "gerund",
            "accent"
          ]
        },
        {
          "es": "Lo sé.",
          "en": "I know it.",
          "tags": [
            "neuter-lo"
          ]
        }
      ],
      "vocab": [
        {
          "es": "comprar",
          "en": "to buy",
          "pos": "verb"
        },
        {
          "es": "leer",
          "en": "to read",
          "pos": "verb"
        },
        {
          "es": "mirar",
          "en": "to watch/look at",
          "pos": "verb"
        },
        {
          "es": "ver",
          "en": "to see",
          "pos": "verb"
        },
        {
          "es": "amar",
          "en": "to love",
          "pos": "verb"
        },
        {
          "es": "coche",
          "en": "car",
          "pos": "noun"
        },
        {
          "es": "libro",
          "en": "book",
          "pos": "noun"
        },
        {
          "es": "casa",
          "en": "house",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Yo _____ compro. (the car)",
          "correct": "lo",
          "distractor": "la",
          "explanation": "Coche is masculine singular, so use lo."
        },
        {
          "sentence": "Ellos _____ tienen. (the houses)",
          "correct": "las",
          "distractor": "los",
          "explanation": "Casas is feminine plural, so use las."
        },
        {
          "sentence": "Quiero comprar_____. (it, masc.)",
          "correct": "lo",
          "distractor": "le",
          "explanation": "DOP attaches to the infinitive: comprarlo."
        },
        {
          "sentence": "Tú estás mirándo_____. (me)",
          "correct": "me",
          "distractor": "te",
          "explanation": "DOP attaches to the gerund with an accent: mirándome."
        },
        {
          "sentence": "Ella mira _____ Juan.",
          "correct": "a",
          "distractor": "el",
          "explanation": "Personal a is required before a human direct object."
        },
        {
          "sentence": "Yo _____ amo. (you)",
          "correct": "te",
          "distractor": "ti",
          "explanation": "Te is the DOP; ti is for after prepositions."
        },
        {
          "sentence": "Voy a leer_____. (the book)",
          "correct": "lo",
          "distractor": "los",
          "explanation": "Libro is masculine singular: leerlo."
        },
        {
          "sentence": "Nosotros _____ vemos a ellos.",
          "correct": "los",
          "distractor": "les",
          "explanation": "Standard DOP for 'them' (m.) is los."
        }
      ],
      "caveats": "Source clean text had OCR errors ('cooch'=coche, 'lios'=libros). Reconstructed from Spanish."
    },
    {
      "chapter_id": "18",
      "slug": "indirect-object-pronouns",
      "title": "Indirect Object Pronouns",
      "time_range_sec": [
        4158,
        4570
      ],
      "summary": "Indirect object pronouns (me, te, le, nos, os, les) mark the recipient of the action; le and les are ambiguous and usually clarified with 'a + prepositional pronoun'.",
      "suggested_grammar_note_id": "object-pronouns",
      "rules": [
        {
          "title": "Forms",
          "bullets": [
            "me, te, le, nos, os, les.",
            "le and les do not show gender; clarify with a + él / ella / usted / name / ellos / ellas / ustedes.",
            "Same placement rules as direct object pronouns."
          ]
        },
        {
          "title": "Placement",
          "bullets": [
            "Before a conjugated verb: Yo te compro un coche.",
            "Attached to an infinitive: Él quiere comprarte un libro.",
            "Attached to a gerund with written accent: Estoy diciéndote la verdad."
          ]
        },
        {
          "title": "Clarification structure",
          "bullets": [
            "Use a + pronoun (or a + name) at the start or end of the sentence.",
            "The IOP is still required even when the recipient is named: Le doy el libro a Juan.",
            "Clarification is most necessary with le and les."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo te compro un coche.",
          "en": "I buy you a car.",
          "tags": [
            "te"
          ]
        },
        {
          "es": "Ella le compra un coche a él.",
          "en": "She buys him a car.",
          "tags": [
            "le",
            "clarification"
          ]
        },
        {
          "es": "Ella le compra un coche a Juan.",
          "en": "She buys Juan a car.",
          "tags": [
            "le",
            "name"
          ]
        },
        {
          "es": "Él quiere comprarte un libro.",
          "en": "He wants to buy you a book.",
          "tags": [
            "te",
            "infinitive"
          ]
        },
        {
          "es": "Ella puede darnos los papeles.",
          "en": "She can give us the papers.",
          "tags": [
            "nos",
            "infinitive"
          ]
        },
        {
          "es": "Yo les enseño los conceptos.",
          "en": "I teach them the concepts.",
          "tags": [
            "les"
          ]
        },
        {
          "es": "Tú le escribes una carta a ella.",
          "en": "You write her a letter.",
          "tags": [
            "le",
            "clarification"
          ]
        },
        {
          "es": "Yo les estoy leyendo el libro.",
          "en": "I am reading them the book.",
          "tags": [
            "les",
            "progressive"
          ]
        },
        {
          "es": "Yo estoy leyéndoles el libro.",
          "en": "I am reading them the book.",
          "tags": [
            "les",
            "gerund",
            "accent"
          ]
        },
        {
          "es": "Nosotros estamos diciéndote la verdad.",
          "en": "We are telling you the truth.",
          "tags": [
            "te",
            "gerund",
            "accent"
          ]
        },
        {
          "es": "Ella está dándole el dinero a él.",
          "en": "She is giving him the money.",
          "tags": [
            "le",
            "gerund",
            "accent"
          ]
        }
      ],
      "vocab": [
        {
          "es": "dar",
          "en": "to give",
          "pos": "verb"
        },
        {
          "es": "decir",
          "en": "to say/tell",
          "pos": "verb"
        },
        {
          "es": "escribir",
          "en": "to write",
          "pos": "verb"
        },
        {
          "es": "enseñar",
          "en": "to teach/show",
          "pos": "verb"
        },
        {
          "es": "carta",
          "en": "letter",
          "pos": "noun"
        },
        {
          "es": "papel",
          "en": "paper",
          "pos": "noun"
        },
        {
          "es": "dinero",
          "en": "money",
          "pos": "noun"
        },
        {
          "es": "verdad",
          "en": "truth",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Yo _____ doy el libro a María.",
          "correct": "le",
          "distractor": "la",
          "explanation": "Indirect object (recipient) requires le, not the DOP la."
        },
        {
          "sentence": "Ella _____ compra los libros (to us).",
          "correct": "nos",
          "distractor": "les",
          "explanation": "Nos = to/for us."
        },
        {
          "sentence": "Yo _____ enseño los conceptos a ellos.",
          "correct": "les",
          "distractor": "los",
          "explanation": "Les is the IOP for them; los would be a DOP."
        },
        {
          "sentence": "Quiero comprar_____ un regalo (to him).",
          "correct": "le",
          "distractor": "lo",
          "explanation": "IOP for the recipient him is le, attached to infinitive."
        },
        {
          "sentence": "Estoy diciéndo_____ la verdad (to you).",
          "correct": "te",
          "distractor": "ti",
          "explanation": "Te is the IOP; ti is only after prepositions."
        },
        {
          "sentence": "Ella le compra un coche _____ él.",
          "correct": "a",
          "distractor": "para",
          "explanation": "Clarification structure uses a + pronoun."
        },
        {
          "sentence": "_____ doy el dinero a ellos. (I)",
          "correct": "Les",
          "distractor": "Le",
          "explanation": "Plural recipient ellos requires les."
        },
        {
          "sentence": "Tú _____ escribes una carta a Emma.",
          "correct": "le",
          "distractor": "la",
          "explanation": "Indirect object 'to Emma' uses le."
        }
      ],
      "caveats": "Source had OCR fragments (e.g., 'L' for él, missing accents); reconstructed from Spanish grammar."
    },
    {
      "chapter_id": "19",
      "slug": "combining-dops-iops",
      "title": "Combining DOPs & IOPs",
      "time_range_sec": [
        4570,
        5034
      ],
      "summary": "When using both indirect and direct object pronouns, the IOP comes first; if both pronouns begin with l- (le/les + lo/la/los/las), le/les changes to se.",
      "suggested_grammar_note_id": "object-pronouns",
      "rules": [
        {
          "title": "Order and placement",
          "bullets": [
            "Indirect object pronoun comes before direct object pronoun (ID order).",
            "Both pronouns go before the conjugated verb, or both attach together to the infinitive/gerund.",
            "You cannot split them: never one before the verb and one attached."
          ]
        },
        {
          "title": "le/les → se",
          "bullets": [
            "When le or les is followed by lo/la/los/las, le/les becomes se to avoid two l-pronouns in a row.",
            "se lo, se la, se los, se las are the only forms produced by this rule.",
            "Because se is ambiguous (him/her/you/them), add a clarifier: a él, a ella, a usted, a ellos, a ellas, a ustedes, or a + name."
          ]
        },
        {
          "title": "Written accents",
          "bullets": [
            "When both pronouns attach to an infinitive or gerund, a written accent is required on the original stressed vowel.",
            "Examples: comprándotelo, hacérselo, dárselo, leyéndoselo."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo te lo compro.",
          "en": "I buy it for you.",
          "tags": [
            "te-lo"
          ]
        },
        {
          "es": "Ella me lo da.",
          "en": "She gives it to me.",
          "tags": [
            "me-lo"
          ]
        },
        {
          "es": "Ella está dándomelo.",
          "en": "She is giving it to me.",
          "tags": [
            "gerund",
            "accent"
          ]
        },
        {
          "es": "Tú estás mostrándonosla.",
          "en": "You are showing it to us.",
          "tags": [
            "nos-la",
            "gerund",
            "accent"
          ]
        },
        {
          "es": "Ellos quieren presentártelos.",
          "en": "They want to present them to you.",
          "tags": [
            "te-los",
            "infinitive",
            "accent"
          ]
        },
        {
          "es": "Ella se lo hace a él.",
          "en": "She makes it for him.",
          "tags": [
            "se-lo",
            "clarification"
          ]
        },
        {
          "es": "Ella quiere hacérselo a él.",
          "en": "She wants to make it for him.",
          "tags": [
            "se-lo",
            "infinitive",
            "accent"
          ]
        },
        {
          "es": "Ella se lo escribe a ella.",
          "en": "She writes it to her.",
          "tags": [
            "se-lo",
            "clarification-ella"
          ]
        },
        {
          "es": "Tú se los lees a ellos.",
          "en": "You read them to them.",
          "tags": [
            "se-los"
          ]
        },
        {
          "es": "Yo se lo estoy comprando a ellos.",
          "en": "I am buying it for them.",
          "tags": [
            "se-lo",
            "progressive"
          ]
        },
        {
          "es": "Yo puedo hacérselo a él.",
          "en": "I can do it for him.",
          "tags": [
            "se-lo",
            "infinitive",
            "accent"
          ]
        }
      ],
      "vocab": [
        {
          "es": "se lo",
          "en": "it to him/her/them (combined pronoun)",
          "pos": "phrase"
        },
        {
          "es": "hacer",
          "en": "to do/make",
          "pos": "verb"
        },
        {
          "es": "presentar",
          "en": "to present/introduce",
          "pos": "verb"
        },
        {
          "es": "mostrar",
          "en": "to show",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Ella _____ da. (it to me)",
          "correct": "me lo",
          "distractor": "lo me",
          "explanation": "IOP comes before DOP: me lo."
        },
        {
          "sentence": "Yo _____ compro a él. (it for him)",
          "correct": "se lo",
          "distractor": "le lo",
          "explanation": "le + lo → se lo to avoid two l-pronouns."
        },
        {
          "sentence": "Tú _____ lees a ellas. (them to them)",
          "correct": "se los",
          "distractor": "les los",
          "explanation": "les + los → se los."
        },
        {
          "sentence": "Ellos quieren present_____. (them to you)",
          "correct": "ártelos",
          "distractor": "artelos",
          "explanation": "When attaching both pronouns to an infinitive, add a written accent: presentártelos."
        },
        {
          "sentence": "Ella está dándo_____. (it to me)",
          "correct": "melo",
          "distractor": "lome",
          "explanation": "Order is me + lo when attached to gerund."
        },
        {
          "sentence": "Yo puedo hacér_____ a él. (it for him)",
          "correct": "selo",
          "distractor": "lelo",
          "explanation": "le → se before lo; result attached to infinitive needs accent: hacérselo."
        },
        {
          "sentence": "Ella se lo escribe _____ él.",
          "correct": "a",
          "distractor": "para",
          "explanation": "Clarification uses a + pronoun (the IOP construction)."
        },
        {
          "sentence": "Nosotros _____ damos. (it to you, sg.)",
          "correct": "te lo",
          "distractor": "lo te",
          "explanation": "IOP te before DOP lo."
        }
      ],
      "caveats": "Source garbled forms ('AOS', 'sayos'); reconstructed from grammar rules."
    },
    {
      "chapter_id": "20",
      "slug": "the-verb-gustar",
      "title": "The Verb Gustar",
      "time_range_sec": [
        5034,
        5388
      ],
      "summary": "Gustar means 'to be pleasing to'; the thing liked is the subject and the experiencer is expressed by an indirect object pronoun. Use gusta with singular nouns/infinitives and gustan with plural nouns.",
      "suggested_grammar_note_id": "gustar-like-verbs",
      "rules": [
        {
          "title": "Backwards structure",
          "bullets": [
            "Translate as 'to be pleasing to', not 'to like'.",
            "The thing liked is the grammatical subject; the person liking is expressed by an indirect object pronoun.",
            "Verb agrees with the subject (the thing), not with the person."
          ]
        },
        {
          "title": "Choosing gusta vs gustan",
          "bullets": [
            "gusta: singular noun or one or more infinitives.",
            "gustan: plural noun.",
            "Multiple infinitives joined by y still take gusta (each infinitive is singular)."
          ]
        },
        {
          "title": "Clarification for le / les",
          "bullets": [
            "Add a + él, a ella, a usted, a ellos, a ellas, a ustedes, or a + name to specify the person.",
            "Optional clarifier a mí / a ti / a nosotros / a vosotros adds emphasis."
          ]
        }
      ],
      "examples": [
        {
          "es": "Me gusta bailar.",
          "en": "I like to dance. (lit. dancing pleases me)",
          "tags": [
            "infinitive"
          ]
        },
        {
          "es": "Me gustan los gatos.",
          "en": "I like cats. (lit. cats please me)",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "Me gustan tus palabras.",
          "en": "I like your words.",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "Te gusta la casa.",
          "en": "You like the house.",
          "tags": [
            "singular"
          ]
        },
        {
          "es": "A él le gusta jugar fútbol.",
          "en": "He likes to play soccer.",
          "tags": [
            "clarification",
            "le"
          ]
        },
        {
          "es": "Nos gusta hablar español.",
          "en": "We like to speak Spanish.",
          "tags": [
            "nos"
          ]
        },
        {
          "es": "Les gusta escuchar la música.",
          "en": "They like to listen to music.",
          "tags": [
            "les"
          ]
        },
        {
          "es": "Me gusta hablar contigo.",
          "en": "I like talking with you.",
          "tags": [
            "infinitive",
            "contigo"
          ]
        },
        {
          "es": "Me gusta bailar y cantar.",
          "en": "I like to dance and sing.",
          "tags": [
            "multiple-infinitives"
          ]
        },
        {
          "es": "A María le gustan los libros.",
          "en": "María likes books.",
          "tags": [
            "clarification",
            "name"
          ]
        },
        {
          "es": "A mí me gusta el café, pero a ella no le gusta.",
          "en": "I like coffee, but she doesn't.",
          "tags": [
            "contrast",
            "emphasis"
          ]
        }
      ],
      "vocab": [
        {
          "es": "gustar",
          "en": "to be pleasing to (≈ to like)",
          "pos": "verb"
        },
        {
          "es": "encantar",
          "en": "to love (be enchanting to)",
          "pos": "verb"
        },
        {
          "es": "doler",
          "en": "to hurt (be painful to)",
          "pos": "verb"
        },
        {
          "es": "molestar",
          "en": "to bother",
          "pos": "verb"
        },
        {
          "es": "interesar",
          "en": "to interest",
          "pos": "verb"
        },
        {
          "es": "importar",
          "en": "to matter",
          "pos": "verb"
        },
        {
          "es": "faltar",
          "en": "to be lacking",
          "pos": "verb"
        },
        {
          "es": "parecer",
          "en": "to seem",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "gustar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "gusto",
            "tu": "gustas",
            "el": "gusta",
            "nosotros": "gustamos",
            "vosotros": "gustáis",
            "ellos": "gustan"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "A mí me _____ la pizza.",
          "correct": "gusta",
          "distractor": "gustan",
          "explanation": "Pizza is singular, so use gusta."
        },
        {
          "sentence": "A nosotros nos _____ los tacos.",
          "correct": "gustan",
          "distractor": "gusta",
          "explanation": "Tacos is plural, so use gustan."
        },
        {
          "sentence": "A ellos _____ gusta jugar fútbol.",
          "correct": "les",
          "distractor": "le",
          "explanation": "Plural ellos requires plural IOP les."
        },
        {
          "sentence": "Me _____ bailar y cantar.",
          "correct": "gusta",
          "distractor": "gustan",
          "explanation": "Multiple infinitives still take singular gusta."
        },
        {
          "sentence": "A Juan _____ gusta el café.",
          "correct": "le",
          "distractor": "lo",
          "explanation": "Gustar requires an IOP (le), not a DOP."
        },
        {
          "sentence": "_____ ti te gustan las películas.",
          "correct": "A",
          "distractor": "Para",
          "explanation": "Clarification structure uses a, not para."
        },
        {
          "sentence": "A María le _____ los gatos.",
          "correct": "gustan",
          "distractor": "gusta",
          "explanation": "Gatos is plural; verb agrees with the subject."
        },
        {
          "sentence": "Me _____ hablar contigo.",
          "correct": "gusta",
          "distractor": "gustan",
          "explanation": "Hablar is a singular infinitive."
        }
      ],
      "caveats": "Several OCR fragments ('Gatos' for los gatos, 'mea B' for me gusta bailar); reconstructed from context."
    },
    {
      "chapter_id": "21",
      "slug": "irregular-yo-verbs",
      "title": "Irregular Yo Verbs",
      "time_range_sec": [
        5388,
        5579
      ],
      "summary": "A group of Spanish verbs are regular in every present-tense form except the yo form, which takes an irregular ending such as -go, -zco, -oy, or -eo.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Common irregular yo endings",
          "bullets": [
            "-go: salir→salgo, hacer→hago, tener→tengo, poner→pongo, suponer→supongo, traer→traigo.",
            "-zco: -cer/-cir verbs after a vowel: conducir→conduzco, traducir→traduzco, conocer→conozco, parecer→parezco.",
            "-oy: dar→doy, ser→soy, estar→estoy, ir→voy.",
            "-eo: ver→veo.",
            "-jo: proteger→protejo (spelling change to keep the soft consonant)."
          ]
        },
        {
          "title": "All other forms are regular",
          "bullets": [
            "Only the yo form changes; tú/él/nosotros/vosotros/ellos follow the standard -ar/-er/-ir endings.",
            "Some irregular-yo verbs are also stem-changing in other persons (e.g., tener: tengo/tienes/tiene)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo salgo de la casa.",
          "en": "I leave the house.",
          "tags": [
            "salir"
          ]
        },
        {
          "es": "Yo hago la tarea.",
          "en": "I do the homework.",
          "tags": [
            "hacer"
          ]
        },
        {
          "es": "Yo tengo dos hermanos.",
          "en": "I have two siblings.",
          "tags": [
            "tener"
          ]
        },
        {
          "es": "Yo conduzco un coche rojo.",
          "en": "I drive a red car.",
          "tags": [
            "conducir"
          ]
        },
        {
          "es": "Yo traduzco el libro al inglés.",
          "en": "I translate the book into English.",
          "tags": [
            "traducir"
          ]
        },
        {
          "es": "Yo doy un regalo a María.",
          "en": "I give María a gift.",
          "tags": [
            "dar"
          ]
        },
        {
          "es": "Yo veo la película.",
          "en": "I watch the movie.",
          "tags": [
            "ver"
          ]
        },
        {
          "es": "Yo pongo el libro en la mesa.",
          "en": "I put the book on the table.",
          "tags": [
            "poner"
          ]
        },
        {
          "es": "Yo supongo que sí.",
          "en": "I suppose so.",
          "tags": [
            "suponer"
          ]
        },
        {
          "es": "Yo traigo el almuerzo.",
          "en": "I bring lunch.",
          "tags": [
            "traer"
          ]
        },
        {
          "es": "Yo protejo a mi familia.",
          "en": "I protect my family.",
          "tags": [
            "proteger"
          ]
        },
        {
          "es": "Yo conozco a Juan.",
          "en": "I know Juan.",
          "tags": [
            "conocer",
            "personal-a"
          ]
        }
      ],
      "vocab": [
        {
          "es": "salir",
          "en": "to leave/go out",
          "pos": "verb"
        },
        {
          "es": "hacer",
          "en": "to do/make",
          "pos": "verb"
        },
        {
          "es": "tener",
          "en": "to have",
          "pos": "verb"
        },
        {
          "es": "poner",
          "en": "to put",
          "pos": "verb"
        },
        {
          "es": "suponer",
          "en": "to suppose",
          "pos": "verb"
        },
        {
          "es": "traer",
          "en": "to bring",
          "pos": "verb"
        },
        {
          "es": "conducir",
          "en": "to drive",
          "pos": "verb"
        },
        {
          "es": "traducir",
          "en": "to translate",
          "pos": "verb"
        },
        {
          "es": "conocer",
          "en": "to know (be familiar with)",
          "pos": "verb"
        },
        {
          "es": "dar",
          "en": "to give",
          "pos": "verb"
        },
        {
          "es": "ver",
          "en": "to see",
          "pos": "verb"
        },
        {
          "es": "proteger",
          "en": "to protect",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "salir",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "salgo",
            "tu": "sales",
            "el": "sale",
            "nosotros": "salimos",
            "vosotros": "salís",
            "ellos": "salen"
          }
        },
        {
          "verb": "hacer",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "hago",
            "tu": "haces",
            "el": "hace",
            "nosotros": "hacemos",
            "vosotros": "hacéis",
            "ellos": "hacen"
          }
        },
        {
          "verb": "tener",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "tengo",
            "tu": "tienes",
            "el": "tiene",
            "nosotros": "tenemos",
            "vosotros": "tenéis",
            "ellos": "tienen"
          }
        },
        {
          "verb": "poner",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "pongo",
            "tu": "pones",
            "el": "pone",
            "nosotros": "ponemos",
            "vosotros": "ponéis",
            "ellos": "ponen"
          }
        },
        {
          "verb": "traer",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "traigo",
            "tu": "traes",
            "el": "trae",
            "nosotros": "traemos",
            "vosotros": "traéis",
            "ellos": "traen"
          }
        },
        {
          "verb": "conducir",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "conduzco",
            "tu": "conduces",
            "el": "conduce",
            "nosotros": "conducimos",
            "vosotros": "conducís",
            "ellos": "conducen"
          }
        },
        {
          "verb": "traducir",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "traduzco",
            "tu": "traduces",
            "el": "traduce",
            "nosotros": "traducimos",
            "vosotros": "traducís",
            "ellos": "traducen"
          }
        },
        {
          "verb": "conocer",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "conozco",
            "tu": "conoces",
            "el": "conoce",
            "nosotros": "conocemos",
            "vosotros": "conocéis",
            "ellos": "conocen"
          }
        },
        {
          "verb": "dar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "doy",
            "tu": "das",
            "el": "da",
            "nosotros": "damos",
            "vosotros": "dais",
            "ellos": "dan"
          }
        },
        {
          "verb": "ver",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "veo",
            "tu": "ves",
            "el": "ve",
            "nosotros": "vemos",
            "vosotros": "veis",
            "ellos": "ven"
          }
        },
        {
          "verb": "proteger",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "protejo",
            "tu": "proteges",
            "el": "protege",
            "nosotros": "protegemos",
            "vosotros": "protegéis",
            "ellos": "protegen"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ de la casa a las ocho. (salir)",
          "correct": "salgo",
          "distractor": "salo",
          "explanation": "Salir takes -go in yo form."
        },
        {
          "sentence": "Yo _____ la tarea cada día. (hacer)",
          "correct": "hago",
          "distractor": "haco",
          "explanation": "Hacer takes -go in yo form."
        },
        {
          "sentence": "Yo _____ un coche nuevo. (conducir)",
          "correct": "conduzco",
          "distractor": "conduco",
          "explanation": "-cir verbs take -zco in yo form."
        },
        {
          "sentence": "Yo _____ a Juan. (conocer)",
          "correct": "conozco",
          "distractor": "conoco",
          "explanation": "-cer verbs after a vowel take -zco."
        },
        {
          "sentence": "Yo _____ la película. (ver)",
          "correct": "veo",
          "distractor": "vo",
          "explanation": "Ver has the irregular yo form veo."
        },
        {
          "sentence": "Yo _____ un regalo. (dar)",
          "correct": "doy",
          "distractor": "do",
          "explanation": "Dar has the irregular yo form doy."
        },
        {
          "sentence": "Yo _____ el libro en la mesa. (poner)",
          "correct": "pongo",
          "distractor": "pono",
          "explanation": "Poner takes -go in yo form."
        },
        {
          "sentence": "Yo _____ el almuerzo. (traer)",
          "correct": "traigo",
          "distractor": "trago",
          "explanation": "Traer is traigo (note the i); trago is from tragar (to swallow)."
        },
        {
          "sentence": "Yo _____ a mi familia. (proteger)",
          "correct": "protejo",
          "distractor": "protego",
          "explanation": "Proteger spells the yo form with j (protejo) to keep the soft consonant sound."
        },
        {
          "sentence": "Yo _____ que sí. (suponer)",
          "correct": "supongo",
          "distractor": "supono",
          "explanation": "Suponer follows the -go pattern like poner."
        }
      ],
      "caveats": "Source had OCR like 'Yoo'/'yuso' for conduzco/traduzco; reconstructed from grammar."
    },
    {
      "chapter_id": "22",
      "slug": "stem-changing-verbs",
      "title": "Stem-Changing Verbs",
      "time_range_sec": [
        5579,
        5812
      ],
      "summary": "Stem-changing verbs modify their internal vowel in all conjugations except nosotros and vosotros. Four categories exist: e→ie, e→i, o→ue, and u→ue (jugar only).",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "The boot pattern",
          "bullets": [
            "Stem change applies in yo, tú, él/ella/usted, ellos/ellas/ustedes.",
            "Nosotros and vosotros keep the original stem."
          ]
        },
        {
          "title": "Four categories",
          "bullets": [
            "e → ie (empezar, pensar, querer, tener)",
            "e → i (decir, pedir, servir)",
            "o → ue (recordar, poder, dormir)",
            "u → ue (only jugar)"
          ]
        },
        {
          "title": "Endings stay regular",
          "bullets": [
            "Only the stem vowel changes; the ending follows normal -ar/-er/-ir conjugation."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo empiezo el trabajo a las ocho.",
          "en": "I start work at eight.",
          "tags": [
            "e>ie"
          ]
        },
        {
          "es": "Tú dices la verdad.",
          "en": "You tell the truth.",
          "tags": [
            "e>i"
          ]
        },
        {
          "es": "Él recuerda mi nombre.",
          "en": "He remembers my name.",
          "tags": [
            "o>ue"
          ]
        },
        {
          "es": "Nosotros jugamos al fútbol.",
          "en": "We play soccer.",
          "tags": [
            "u>ue",
            "nosotros-no-change"
          ]
        },
        {
          "es": "Ellos pueden venir mañana.",
          "en": "They can come tomorrow.",
          "tags": [
            "o>ue"
          ]
        },
        {
          "es": "Yo juego un videojuego.",
          "en": "I play a video game.",
          "tags": [
            "u>ue"
          ]
        },
        {
          "es": "Ella piensa en ti.",
          "en": "She thinks about you.",
          "tags": [
            "e>ie"
          ]
        },
        {
          "es": "Nosotros recordamos la canción.",
          "en": "We remember the song.",
          "tags": [
            "o>ue",
            "nosotros-no-change"
          ]
        }
      ],
      "vocab": [
        {
          "es": "empezar",
          "en": "to start",
          "pos": "verb"
        },
        {
          "es": "decir",
          "en": "to say",
          "pos": "verb"
        },
        {
          "es": "recordar",
          "en": "to remember",
          "pos": "verb"
        },
        {
          "es": "jugar",
          "en": "to play",
          "pos": "verb"
        },
        {
          "es": "pensar",
          "en": "to think",
          "pos": "verb"
        },
        {
          "es": "jugo",
          "en": "juice",
          "pos": "noun"
        },
        {
          "es": "juego",
          "en": "game",
          "pos": "noun"
        },
        {
          "es": "videojuego",
          "en": "video game",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "empezar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "empiezo",
            "tu": "empiezas",
            "el": "empieza",
            "nosotros": "empezamos",
            "vosotros": "empezáis",
            "ellos": "empiezan"
          }
        },
        {
          "verb": "decir",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "digo",
            "tu": "dices",
            "el": "dice",
            "nosotros": "decimos",
            "vosotros": "decís",
            "ellos": "dicen"
          }
        },
        {
          "verb": "recordar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "recuerdo",
            "tu": "recuerdas",
            "el": "recuerda",
            "nosotros": "recordamos",
            "vosotros": "recordáis",
            "ellos": "recuerdan"
          }
        },
        {
          "verb": "jugar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "juego",
            "tu": "juegas",
            "el": "juega",
            "nosotros": "jugamos",
            "vosotros": "jugáis",
            "ellos": "juegan"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ a estudiar a las nueve. (empezar)",
          "correct": "empiezo",
          "distractor": "empezo",
          "explanation": "empezar is e→ie; the yo form is empiezo."
        },
        {
          "sentence": "Nosotros _____ al fútbol los sábados. (jugar)",
          "correct": "jugamos",
          "distractor": "juegamos",
          "explanation": "Nosotros doesn't take the stem change; it stays jugamos."
        },
        {
          "sentence": "Ella _____ que sí. (decir)",
          "correct": "dice",
          "distractor": "dece",
          "explanation": "decir is e→i; él/ella form is dice."
        },
        {
          "sentence": "Yo _____ tu cumpleaños. (recordar)",
          "correct": "recuerdo",
          "distractor": "recordo",
          "explanation": "recordar is o→ue; the yo form is recuerdo."
        },
        {
          "sentence": "Ellos _____ venir hoy. (poder)",
          "correct": "pueden",
          "distractor": "poden",
          "explanation": "poder is o→ue; ellos form is pueden."
        },
        {
          "sentence": "Vosotros _____ pronto. (empezar)",
          "correct": "empezáis",
          "distractor": "empiezáis",
          "explanation": "Vosotros keeps the original stem: empezáis."
        }
      ],
      "caveats": "OCR contained many garbled phonetic spellings (e.g., 'empar', 'koso', 'huego'); reconstructed using standard Spanish spellings."
    },
    {
      "chapter_id": "23",
      "slug": "the-verb-saber",
      "title": "The Verb Saber",
      "time_range_sec": [
        5812,
        5991
      ],
      "summary": "Saber means 'to know' factual information or 'to know how to do something.' Conjugates regularly except in the yo form (sé). Spanish drops 'cómo' before infinitives.",
      "suggested_grammar_note_id": "saber-vs-conocer",
      "rules": [
        {
          "title": "When to use saber",
          "bullets": [
            "Knowing factual information (facts, times, answers).",
            "Knowing how to do something (skills, learned abilities).",
            "Think of saber as the cognitive equivalent of ser (factual identity)."
          ]
        },
        {
          "title": "Irregular yo: sé",
          "bullets": [
            "yo sé carries an accent to distinguish from 'se' (reflexive/IOP).",
            "All other forms follow the regular -er pattern."
          ]
        },
        {
          "title": "No 'cómo' before infinitives",
          "bullets": [
            "Say 'Yo sé hablar español' not 'Yo sé cómo hablar español.'",
            "The act of knowing how is implicit in saber + infinitive."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo sé hablar español.",
          "en": "I know how to speak Spanish.",
          "tags": [
            "skill"
          ]
        },
        {
          "es": "Tú sabes la hora.",
          "en": "You know the time.",
          "tags": [
            "fact"
          ]
        },
        {
          "es": "Él sabe nadar.",
          "en": "He knows how to swim.",
          "tags": [
            "skill"
          ]
        },
        {
          "es": "Yo sé hablar inglés.",
          "en": "I know how to speak English.",
          "tags": [
            "skill"
          ]
        },
        {
          "es": "Tú sabes tocar el piano.",
          "en": "You know how to play the piano.",
          "tags": [
            "skill"
          ]
        },
        {
          "es": "Él sabe cocinar bien.",
          "en": "He knows how to cook well.",
          "tags": [
            "skill"
          ]
        },
        {
          "es": "Nosotros sabemos la respuesta.",
          "en": "We know the answer.",
          "tags": [
            "fact"
          ]
        },
        {
          "es": "Ellos saben la verdad.",
          "en": "They know the truth.",
          "tags": [
            "fact"
          ]
        },
        {
          "es": "¿Sabes el número de teléfono?",
          "en": "Do you know the phone number?",
          "tags": [
            "fact",
            "question"
          ]
        }
      ],
      "vocab": [
        {
          "es": "saber",
          "en": "to know (facts/skills)",
          "pos": "verb"
        },
        {
          "es": "la verdad",
          "en": "the truth",
          "pos": "noun"
        },
        {
          "es": "la respuesta",
          "en": "the answer",
          "pos": "noun"
        },
        {
          "es": "nadar",
          "en": "to swim",
          "pos": "verb"
        },
        {
          "es": "cocinar",
          "en": "to cook",
          "pos": "verb"
        },
        {
          "es": "tocar",
          "en": "to play (an instrument)",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "saber",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "sé",
            "tu": "sabes",
            "el": "sabe",
            "nosotros": "sabemos",
            "vosotros": "sabéis",
            "ellos": "saben"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ la respuesta a la pregunta.",
          "correct": "sé",
          "distractor": "conozco",
          "explanation": "Knowing a fact uses saber; yo form is sé (with accent)."
        },
        {
          "sentence": "Tú _____ tocar la guitarra muy bien.",
          "correct": "sabes",
          "distractor": "conoces",
          "explanation": "Knowing how to do something is a skill — use saber."
        },
        {
          "sentence": "Yo _____ hablar tres idiomas.",
          "correct": "sé",
          "distractor": "se",
          "explanation": "Yo sé needs the accent; without it, 'se' is a reflexive pronoun."
        },
        {
          "sentence": "Nosotros _____ la verdad sobre eso.",
          "correct": "sabemos",
          "distractor": "conocemos",
          "explanation": "The truth is a fact — use saber."
        },
        {
          "sentence": "Ella _____ cocinar comida italiana.",
          "correct": "sabe",
          "distractor": "conoce",
          "explanation": "Cooking is a skill (how to do something) — use saber."
        },
        {
          "sentence": "Ellos _____ qué hora es.",
          "correct": "saben",
          "distractor": "conocen",
          "explanation": "Time is factual information — use saber."
        }
      ],
      "caveats": "OCR truncated 'sé' to 'say' and 'sabe' to 'sa' in many spots; reconstructed from context."
    },
    {
      "chapter_id": "24",
      "slug": "the-verb-conocer",
      "title": "The Verb Conocer",
      "time_range_sec": [
        5991,
        6185
      ],
      "summary": "Conocer means 'to know' in the sense of being familiar or acquainted with people, places, or things. Conjugates regularly except yo: conozco. Requires personal 'a' before people.",
      "suggested_grammar_note_id": "saber-vs-conocer",
      "rules": [
        {
          "title": "When to use conocer",
          "bullets": [
            "Being familiar with people (¿Conoces a Juan?).",
            "Being familiar with places (Conozco Madrid).",
            "Being familiar with things (Conozco esa canción)."
          ]
        },
        {
          "title": "Irregular yo: conozco",
          "bullets": [
            "The yo form takes -zco, not -co.",
            "All other forms follow the regular -er pattern."
          ]
        },
        {
          "title": "Personal a",
          "bullets": [
            "Required before a person who is the direct object: Conozco a María.",
            "Not required before places or things: Conozco la ciudad."
          ]
        },
        {
          "title": "Use direct object pronouns",
          "bullets": [
            "¿Conoces a John? → Sí, lo conozco.",
            "¿Conoces la ciudad? → Sí, la conozco."
          ]
        }
      ],
      "examples": [
        {
          "es": "¿Conoces la ciudad de Las Vegas?",
          "en": "Are you familiar with the city of Las Vegas?",
          "tags": [
            "place",
            "question"
          ]
        },
        {
          "es": "Sí, yo conozco la ciudad.",
          "en": "Yes, I'm familiar with the city.",
          "tags": [
            "place"
          ]
        },
        {
          "es": "¿Conoces a John?",
          "en": "Are you familiar with John?",
          "tags": [
            "person",
            "personal-a"
          ]
        },
        {
          "es": "Sí, yo conozco a John.",
          "en": "Yes, I know John.",
          "tags": [
            "person",
            "personal-a"
          ]
        },
        {
          "es": "Sí, yo lo conozco.",
          "en": "Yes, I know him.",
          "tags": [
            "dop"
          ]
        },
        {
          "es": "Él conoce a mi abuelo.",
          "en": "He knows my grandfather.",
          "tags": [
            "person",
            "personal-a"
          ]
        },
        {
          "es": "Yo conozco los libros.",
          "en": "I'm familiar with the books.",
          "tags": [
            "thing"
          ]
        },
        {
          "es": "Tú quieres conocer el país.",
          "en": "You want to be familiar with the country.",
          "tags": [
            "place",
            "infinitive"
          ]
        }
      ],
      "vocab": [
        {
          "es": "conocer",
          "en": "to know (be familiar with)",
          "pos": "verb"
        },
        {
          "es": "la ciudad",
          "en": "the city",
          "pos": "noun"
        },
        {
          "es": "el país",
          "en": "the country",
          "pos": "noun"
        },
        {
          "es": "el abuelo",
          "en": "the grandfather",
          "pos": "noun"
        },
        {
          "es": "el libro",
          "en": "the book",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "conocer",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "conozco",
            "tu": "conoces",
            "el": "conoce",
            "nosotros": "conocemos",
            "vosotros": "conocéis",
            "ellos": "conocen"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ a María desde la escuela.",
          "correct": "conozco",
          "distractor": "sé",
          "explanation": "Knowing a person uses conocer (with personal 'a'). Yo form is conozco."
        },
        {
          "sentence": "¿Tú _____ Madrid?",
          "correct": "conoces",
          "distractor": "sabes",
          "explanation": "Knowing a place uses conocer."
        },
        {
          "sentence": "Nosotros _____ esta canción.",
          "correct": "conocemos",
          "distractor": "sabemos",
          "explanation": "Being familiar with a thing uses conocer."
        },
        {
          "sentence": "Ellos _____ a mis padres.",
          "correct": "conocen",
          "distractor": "saben",
          "explanation": "Knowing people uses conocer with personal a."
        },
        {
          "sentence": "Ella _____ que tú vienes mañana.",
          "correct": "sabe",
          "distractor": "conoce",
          "explanation": "A fact (that you're coming) uses saber, not conocer."
        },
        {
          "sentence": "Yo _____ ese restaurante; está cerca.",
          "correct": "conozco",
          "distractor": "sé",
          "explanation": "Familiarity with a place uses conocer."
        }
      ],
      "caveats": "OCR consistently dropped the 'no' from 'conozco'/'conoce' (rendered as 'koso', 'kos'); reconstructed."
    },
    {
      "chapter_id": "25",
      "slug": "past-tense-for-regular-verbs",
      "title": "Past Tense for Regular Verbs (Preterite)",
      "time_range_sec": [
        6185,
        6488
      ],
      "summary": "The preterite (past simple) of regular verbs is built by dropping -ar/-er/-ir and adding preterite endings. -er and -ir share endings. Yo and él forms carry accents.",
      "suggested_grammar_note_id": "preterite-vs-imperfect",
      "rules": [
        {
          "title": "Preterite endings",
          "bullets": [
            "-ar verbs: -é, -aste, -ó, -amos, -asteis, -aron",
            "-er and -ir verbs share endings: -í, -iste, -ió, -imos, -isteis, -ieron"
          ]
        },
        {
          "title": "Written accents",
          "bullets": [
            "yo and él/ella forms carry written accents on the final vowel.",
            "Without the accent, 'hablo' = present 'I speak'; 'habló' = preterite 'he spoke'."
          ]
        },
        {
          "title": "Ambiguous nosotros",
          "bullets": [
            "For -ar and -ir verbs, nosotros preterite = nosotros present (hablamos, vivimos).",
            "Use time markers to disambiguate: ayer, anoche, hace un año."
          ]
        },
        {
          "title": "Use the preterite for",
          "bullets": [
            "Completed actions with a clear endpoint in the past.",
            "Sequenced past events (and then... and then...)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo hablé con mi madre ayer.",
          "en": "I spoke with my mother yesterday.",
          "tags": [
            "preterite",
            "ar"
          ]
        },
        {
          "es": "Tú comiste mucho anoche.",
          "en": "You ate a lot last night.",
          "tags": [
            "preterite",
            "er"
          ]
        },
        {
          "es": "Él vivió en México por dos años.",
          "en": "He lived in Mexico for two years.",
          "tags": [
            "preterite",
            "ir"
          ]
        },
        {
          "es": "Hablamos con ellos ayer.",
          "en": "We spoke with them yesterday.",
          "tags": [
            "preterite",
            "ambiguous-nosotros"
          ]
        },
        {
          "es": "Vivimos en Los Ángeles hace un año.",
          "en": "We lived in Los Angeles a year ago.",
          "tags": [
            "preterite",
            "ambiguous-nosotros"
          ]
        },
        {
          "es": "Ellos escribieron las cartas.",
          "en": "They wrote the letters.",
          "tags": [
            "preterite",
            "ir"
          ]
        },
        {
          "es": "Yo trabajé toda la noche.",
          "en": "I worked all night.",
          "tags": [
            "preterite",
            "ar"
          ]
        },
        {
          "es": "Ella corrió en el parque.",
          "en": "She ran in the park.",
          "tags": [
            "preterite",
            "er"
          ]
        }
      ],
      "vocab": [
        {
          "es": "ayer",
          "en": "yesterday",
          "pos": "adv"
        },
        {
          "es": "anoche",
          "en": "last night",
          "pos": "adv"
        },
        {
          "es": "hace un año",
          "en": "a year ago",
          "pos": "phrase"
        },
        {
          "es": "el año pasado",
          "en": "last year",
          "pos": "phrase"
        },
        {
          "es": "hablar",
          "en": "to speak",
          "pos": "verb"
        },
        {
          "es": "comer",
          "en": "to eat",
          "pos": "verb"
        },
        {
          "es": "vivir",
          "en": "to live",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "hablé",
            "tu": "hablaste",
            "el": "habló",
            "nosotros": "hablamos",
            "vosotros": "hablasteis",
            "ellos": "hablaron"
          }
        },
        {
          "verb": "comer",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "comí",
            "tu": "comiste",
            "el": "comió",
            "nosotros": "comimos",
            "vosotros": "comisteis",
            "ellos": "comieron"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "viví",
            "tu": "viviste",
            "el": "vivió",
            "nosotros": "vivimos",
            "vosotros": "vivisteis",
            "ellos": "vivieron"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Ayer yo _____ con mi amigo. (hablar)",
          "correct": "hablé",
          "distractor": "hablo",
          "explanation": "Yo preterite of hablar = hablé (with accent)."
        },
        {
          "sentence": "Tú _____ una pizza anoche. (comer)",
          "correct": "comiste",
          "distractor": "comes",
          "explanation": "Tú preterite of comer = comiste."
        },
        {
          "sentence": "Ella _____ en Madrid el año pasado. (vivir)",
          "correct": "vivió",
          "distractor": "vive",
          "explanation": "Él/ella preterite of vivir = vivió."
        },
        {
          "sentence": "Nosotros _____ en el restaurante ayer. (comer)",
          "correct": "comimos",
          "distractor": "comamos",
          "explanation": "Nosotros preterite of comer = comimos."
        },
        {
          "sentence": "Ellos _____ todo el día. (trabajar)",
          "correct": "trabajaron",
          "distractor": "trabajan",
          "explanation": "Ellos preterite of trabajar = trabajaron."
        },
        {
          "sentence": "Yo _____ tres millas esta mañana. (correr)",
          "correct": "corrí",
          "distractor": "corro",
          "explanation": "Yo preterite of correr = corrí."
        },
        {
          "sentence": "Tú _____ la carta. (escribir)",
          "correct": "escribiste",
          "distractor": "escribes",
          "explanation": "Tú preterite of escribir = escribiste."
        }
      ],
      "caveats": "OCR consistently dropped accents from 'é' and 'ó'; reconstructed standard preterite forms."
    },
    {
      "chapter_id": "26",
      "slug": "past-tense-of-ser-and-ir",
      "title": "Past Tense of Ser and Ir",
      "time_range_sec": [
        6488,
        6872
      ],
      "summary": "Ser and ir share identical preterite conjugations: fui, fuiste, fue, fuimos, fuisteis, fueron. Context, especially the preposition 'a', distinguishes them. No accents on these forms.",
      "suggested_grammar_note_id": "preterite-vs-imperfect",
      "rules": [
        {
          "title": "Identical forms",
          "bullets": [
            "ser and ir share the exact same preterite: fui, fuiste, fue, fuimos, fuisteis, fueron.",
            "No written accents on any form."
          ]
        },
        {
          "title": "Distinguishing ser from ir",
          "bullets": [
            "If the preposition 'a' follows (with or without an infinitive), the verb is ir.",
            "Otherwise, the verb is usually ser."
          ]
        },
        {
          "title": "When ser is used in preterite",
          "bullets": [
            "Events that took place at a specific moment (when, where, how).",
            "Completed states/judgments about events: 'La película fue aburrida.'",
            "For describing how things were generally, use the imperfect (era), not preterite."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo fui a la tienda.",
          "en": "I went to the store.",
          "tags": [
            "ir",
            "preterite"
          ]
        },
        {
          "es": "Tú fuiste a hacer tu tarea.",
          "en": "You went to do your homework.",
          "tags": [
            "ir",
            "preterite"
          ]
        },
        {
          "es": "Ella fue al concierto ayer.",
          "en": "She went to the concert yesterday.",
          "tags": [
            "ir",
            "preterite"
          ]
        },
        {
          "es": "Fuimos a ver la fiesta.",
          "en": "We went to see the party.",
          "tags": [
            "ir",
            "preterite"
          ]
        },
        {
          "es": "Ellos fueron a la playa.",
          "en": "They went to the beach.",
          "tags": [
            "ir",
            "preterite"
          ]
        },
        {
          "es": "La película fue aburrida.",
          "en": "The movie was boring.",
          "tags": [
            "ser",
            "preterite",
            "event"
          ]
        },
        {
          "es": "Fue difícil hacer la prueba.",
          "en": "It was difficult to do the test.",
          "tags": [
            "ser",
            "preterite"
          ]
        },
        {
          "es": "La fiesta fue en el club.",
          "en": "The party was in the club.",
          "tags": [
            "ser",
            "preterite",
            "event-location"
          ]
        },
        {
          "es": "Fue un día largo.",
          "en": "It was a long day.",
          "tags": [
            "ser",
            "preterite"
          ]
        },
        {
          "es": "Fuimos amigos por años.",
          "en": "We were friends for years.",
          "tags": [
            "ser",
            "preterite"
          ]
        }
      ],
      "vocab": [
        {
          "es": "ser",
          "en": "to be",
          "pos": "verb"
        },
        {
          "es": "ir",
          "en": "to go",
          "pos": "verb"
        },
        {
          "es": "la película",
          "en": "the movie",
          "pos": "noun"
        },
        {
          "es": "la prueba",
          "en": "the test",
          "pos": "noun"
        },
        {
          "es": "el concierto",
          "en": "the concert",
          "pos": "noun"
        },
        {
          "es": "la fiesta",
          "en": "the party",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "ser",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "fui",
            "tu": "fuiste",
            "el": "fue",
            "nosotros": "fuimos",
            "vosotros": "fuisteis",
            "ellos": "fueron"
          }
        },
        {
          "verb": "ir",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "fui",
            "tu": "fuiste",
            "el": "fue",
            "nosotros": "fuimos",
            "vosotros": "fuisteis",
            "ellos": "fueron"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Ayer yo _____ al cine.",
          "correct": "fui",
          "distractor": "iba",
          "explanation": "Preterite of ir = fui (completed action). 'Iba' is imperfect."
        },
        {
          "sentence": "La fiesta _____ muy divertida.",
          "correct": "fue",
          "distractor": "era",
          "explanation": "An event that happened — use the preterite of ser (fue)."
        },
        {
          "sentence": "Nosotros _____ a la playa el sábado.",
          "correct": "fuimos",
          "distractor": "vamos",
          "explanation": "Preterite of ir = fuimos. 'Vamos' is present."
        },
        {
          "sentence": "Tú _____ doctor antes, ¿verdad?",
          "correct": "fuiste",
          "distractor": "fue",
          "explanation": "Tú preterite of ser = fuiste."
        },
        {
          "sentence": "Ellos _____ al supermercado anoche.",
          "correct": "fueron",
          "distractor": "fueran",
          "explanation": "Preterite of ir, ellos form = fueron."
        },
        {
          "sentence": "_____ difícil aprender español.",
          "correct": "Fue",
          "distractor": "Era",
          "explanation": "Completed evaluation of an event — preterite of ser (fue)."
        },
        {
          "sentence": "¿A dónde _____ tú anoche?",
          "correct": "fuiste",
          "distractor": "fueras",
          "explanation": "Preterite of ir, tú form = fuiste."
        }
      ],
      "caveats": "OCR rendered 'fui' as 'F', 'fue' as 'Fu', 'fueron' as 'fuon' — reconstructed standard preterite forms."
    },
    {
      "chapter_id": "27",
      "slug": "irregular-verbs-in-the-past-part-1",
      "title": "Irregular Verbs in the Past - Part 1",
      "time_range_sec": [
        6872,
        7316
      ],
      "summary": "A large class of Spanish verbs uses irregular preterite stems (tuv-, estuv-, anduv-, pus-, conduj-, dij-, traj-, hic-, vin-) with shared unstressed endings -e, -iste, -o, -imos, -isteis, -(i)eron.",
      "suggested_grammar_note_id": "preterite-vs-imperfect",
      "rules": [
        {
          "title": "Shared endings",
          "bullets": [
            "All irregular preterite verbs use: -e, -iste, -o, -imos, -isteis, -ieron.",
            "No written accents on yo or él/ella forms (unlike regular preterites)."
          ]
        },
        {
          "title": "j-stem verbs",
          "bullets": [
            "Verbs with stems ending in -j (decir → dij-, traer → traj-, conducir → conduj-) take -eron instead of -ieron.",
            "Example: dijeron (not dijieron), trajeron, condujeron."
          ]
        },
        {
          "title": "hacer's spelling change",
          "bullets": [
            "Él/ella form: hizo (with z), not 'hico'.",
            "The c→z change preserves the soft 's' sound before o."
          ]
        },
        {
          "title": "Verbs with prefixes",
          "bullets": [
            "Compound verbs follow the same pattern: detener → detuve, proponer → propuse, predecir → predije, prevenir → previne."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo tuve un gato.",
          "en": "I had a cat.",
          "tags": [
            "tener",
            "preterite"
          ]
        },
        {
          "es": "Tú tuviste que hacer tu tarea.",
          "en": "You had to do your homework.",
          "tags": [
            "tener",
            "tener-que"
          ]
        },
        {
          "es": "Estuve en Madrid con él.",
          "en": "I was in Madrid with him.",
          "tags": [
            "estar",
            "preterite"
          ]
        },
        {
          "es": "Yo puse mi teléfono aquí.",
          "en": "I put my phone here.",
          "tags": [
            "poner",
            "preterite"
          ]
        },
        {
          "es": "¿Dónde pusiste mi camisa?",
          "en": "Where did you put my shirt?",
          "tags": [
            "poner",
            "question"
          ]
        },
        {
          "es": "Yo te dije que voy a estar allí.",
          "en": "I told you I'm going to be there.",
          "tags": [
            "decir",
            "preterite"
          ]
        },
        {
          "es": "Él me dijo eso ayer.",
          "en": "He told me that yesterday.",
          "tags": [
            "decir",
            "preterite"
          ]
        },
        {
          "es": "Ellos nos dijeron que están ahí.",
          "en": "They told us they're there.",
          "tags": [
            "decir",
            "j-stem"
          ]
        },
        {
          "es": "¿Qué hiciste ayer?",
          "en": "What did you do yesterday?",
          "tags": [
            "hacer",
            "question"
          ]
        },
        {
          "es": "Yo hice mi tarea.",
          "en": "I did my homework.",
          "tags": [
            "hacer",
            "preterite"
          ]
        },
        {
          "es": "Nosotros hicimos la cama.",
          "en": "We made the bed.",
          "tags": [
            "hacer",
            "preterite"
          ]
        },
        {
          "es": "Ellos hicieron un pastel para nosotros.",
          "en": "They made a cake for us.",
          "tags": [
            "hacer",
            "preterite"
          ]
        },
        {
          "es": "¿De dónde viniste?",
          "en": "Where did you come from?",
          "tags": [
            "venir",
            "question"
          ]
        },
        {
          "es": "Yo vine de mi casa.",
          "en": "I came from my house.",
          "tags": [
            "venir",
            "preterite"
          ]
        },
        {
          "es": "Yo conduje al trabajo.",
          "en": "I drove to work.",
          "tags": [
            "conducir",
            "preterite"
          ]
        }
      ],
      "vocab": [
        {
          "es": "tener",
          "en": "to have",
          "pos": "verb"
        },
        {
          "es": "estar",
          "en": "to be (location/condition)",
          "pos": "verb"
        },
        {
          "es": "andar",
          "en": "to walk",
          "pos": "verb"
        },
        {
          "es": "poner",
          "en": "to put",
          "pos": "verb"
        },
        {
          "es": "conducir",
          "en": "to drive",
          "pos": "verb"
        },
        {
          "es": "traducir",
          "en": "to translate",
          "pos": "verb"
        },
        {
          "es": "producir",
          "en": "to produce",
          "pos": "verb"
        },
        {
          "es": "decir",
          "en": "to say/tell",
          "pos": "verb"
        },
        {
          "es": "traer",
          "en": "to bring",
          "pos": "verb"
        },
        {
          "es": "hacer",
          "en": "to do/make",
          "pos": "verb"
        },
        {
          "es": "venir",
          "en": "to come",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "tener",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "tuve",
            "tu": "tuviste",
            "el": "tuvo",
            "nosotros": "tuvimos",
            "vosotros": "tuvisteis",
            "ellos": "tuvieron"
          }
        },
        {
          "verb": "estar",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "estuve",
            "tu": "estuviste",
            "el": "estuvo",
            "nosotros": "estuvimos",
            "vosotros": "estuvisteis",
            "ellos": "estuvieron"
          }
        },
        {
          "verb": "andar",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "anduve",
            "tu": "anduviste",
            "el": "anduvo",
            "nosotros": "anduvimos",
            "vosotros": "anduvisteis",
            "ellos": "anduvieron"
          }
        },
        {
          "verb": "poner",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "puse",
            "tu": "pusiste",
            "el": "puso",
            "nosotros": "pusimos",
            "vosotros": "pusisteis",
            "ellos": "pusieron"
          }
        },
        {
          "verb": "conducir",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "conduje",
            "tu": "condujiste",
            "el": "condujo",
            "nosotros": "condujimos",
            "vosotros": "condujisteis",
            "ellos": "condujeron"
          }
        },
        {
          "verb": "decir",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "dije",
            "tu": "dijiste",
            "el": "dijo",
            "nosotros": "dijimos",
            "vosotros": "dijisteis",
            "ellos": "dijeron"
          }
        },
        {
          "verb": "traer",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "traje",
            "tu": "trajiste",
            "el": "trajo",
            "nosotros": "trajimos",
            "vosotros": "trajisteis",
            "ellos": "trajeron"
          }
        },
        {
          "verb": "hacer",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "hice",
            "tu": "hiciste",
            "el": "hizo",
            "nosotros": "hicimos",
            "vosotros": "hicisteis",
            "ellos": "hicieron"
          }
        },
        {
          "verb": "venir",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "vine",
            "tu": "viniste",
            "el": "vino",
            "nosotros": "vinimos",
            "vosotros": "vinisteis",
            "ellos": "vinieron"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Ayer yo _____ que trabajar mucho. (tener)",
          "correct": "tuve",
          "distractor": "tení",
          "explanation": "Preterite of tener uses tuv- stem: tuve."
        },
        {
          "sentence": "Nosotros _____ en la playa el verano pasado. (estar)",
          "correct": "estuvimos",
          "distractor": "estábamos",
          "explanation": "Preterite of estar uses estuv-: estuvimos. 'Estábamos' is imperfect."
        },
        {
          "sentence": "Yo _____ las llaves en la mesa. (poner)",
          "correct": "puse",
          "distractor": "ponía",
          "explanation": "Preterite of poner uses pus-: puse."
        },
        {
          "sentence": "Ellos me _____ la verdad. (decir)",
          "correct": "dijeron",
          "distractor": "dijieron",
          "explanation": "j-stem verbs take -eron, not -ieron: dijeron."
        },
        {
          "sentence": "¿Qué _____ tú anoche? (hacer)",
          "correct": "hiciste",
          "distractor": "hizo",
          "explanation": "Tú preterite of hacer = hiciste."
        },
        {
          "sentence": "Ella _____ un pastel para mi cumpleaños. (hacer)",
          "correct": "hizo",
          "distractor": "hico",
          "explanation": "Él/ella form of hacer is hizo (with z) to preserve the soft sound."
        },
        {
          "sentence": "Yo _____ tarde a la fiesta. (venir)",
          "correct": "vine",
          "distractor": "vení",
          "explanation": "Preterite of venir uses vin-: vine."
        },
        {
          "sentence": "Nosotros _____ comida a la fiesta. (traer)",
          "correct": "trajimos",
          "distractor": "traímos",
          "explanation": "Preterite of traer uses traj-: trajimos."
        },
        {
          "sentence": "Tú _____ el coche al taller. (conducir)",
          "correct": "condujiste",
          "distractor": "conduciste",
          "explanation": "Preterite of conducir uses conduj-: condujiste."
        }
      ],
      "caveats": "OCR garbled stems (e.g. 'tovo' for tuvo, 'EST' for estuv-); reconstructed standard irregular preterite stems."
    },
    {
      "chapter_id": "28",
      "slug": "irregular-verbs-in-the-past-part-2",
      "title": "Irregular Verbs in the Past - Part 2",
      "time_range_sec": [
        7316,
        7780
      ],
      "summary": "Finishes the irregular preterites: caber/poder/saber/querer (one-off stems), ver/dar (no accents), 3rd-person stem-changing -ir verbs (e→i, o→u), y-insertion verbs (leer/creer/oír), and -car/-gar/-zar yo-only spelling changes.",
      "suggested_grammar_note_id": "preterite-vs-imperfect",
      "rules": [
        {
          "title": "More irregular stems",
          "bullets": [
            "caber → cupe; poder → pude; saber → supe; querer → quise.",
            "Same shared endings as Part 1: -e, -iste, -o, -imos, -isteis, -ieron.",
            "supe often means 'I found out'; quise means 'I tried/wanted (and stopped)'; no quise = 'I refused'."
          ]
        },
        {
          "title": "ver and dar",
          "bullets": [
            "Use the regular -er/-ir endings but write them without accents: vi/vio, di/dio.",
            "ver: vi, viste, vio, vimos, visteis, vieron.",
            "dar: di, diste, dio, dimos, disteis, dieron."
          ]
        },
        {
          "title": "3rd-person stem-changing -ir verbs",
          "bullets": [
            "Only the él/ella and ellos forms change: e→i (sentir→sintió, pedir→pidió, dormir→durmió, morir→murió).",
            "All other forms are regular -ir preterite."
          ]
        },
        {
          "title": "y-insertion (leer, creer, oír)",
          "bullets": [
            "The él form takes -yó, ellos takes -yeron (leyó, creyeron, oyeron).",
            "Other forms carry written accents to break the vowel cluster: leíste, oímos."
          ]
        },
        {
          "title": "Yo-only spelling changes",
          "bullets": [
            "-car → -qué (practicar → practiqué; buscar → busqué).",
            "-gar → -gué (jugar → jugué; llegar → llegué).",
            "-zar → -cé (organizar → organicé; empezar → empecé).",
            "Only the yo form changes; all others are regular."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo pude hablar con él.",
          "en": "I could speak with him.",
          "tags": [
            "poder",
            "preterite"
          ]
        },
        {
          "es": "Tú pudiste ir a la fiesta.",
          "en": "You could go to the party.",
          "tags": [
            "poder"
          ]
        },
        {
          "es": "Yo supe quién ganó el juego.",
          "en": "I found out who won the game.",
          "tags": [
            "saber",
            "preterite"
          ]
        },
        {
          "es": "Yo quise jugar contigo.",
          "en": "I wanted to play with you.",
          "tags": [
            "querer",
            "preterite"
          ]
        },
        {
          "es": "Ella quiso abrir la puerta.",
          "en": "She wanted to open the door.",
          "tags": [
            "querer"
          ]
        },
        {
          "es": "Yo te vi en la fiesta.",
          "en": "I saw you at the party.",
          "tags": [
            "ver"
          ]
        },
        {
          "es": "Él vio cómo yo hice mi tarea.",
          "en": "He saw how I did my homework.",
          "tags": [
            "ver"
          ]
        },
        {
          "es": "Yo te di mi lápiz.",
          "en": "I gave you my pencil.",
          "tags": [
            "dar"
          ]
        },
        {
          "es": "Él nos dio el pase.",
          "en": "He gave us the pass.",
          "tags": [
            "dar"
          ]
        },
        {
          "es": "Ellos durmieron toda la tarde.",
          "en": "They slept all afternoon.",
          "tags": [
            "dormir",
            "stem-change-3rd"
          ]
        },
        {
          "es": "Ella pidió un café.",
          "en": "She ordered a coffee.",
          "tags": [
            "pedir",
            "stem-change-3rd"
          ]
        },
        {
          "es": "Él leyó el libro.",
          "en": "He read the book.",
          "tags": [
            "leer",
            "y-insertion"
          ]
        },
        {
          "es": "Yo practiqué el piano ayer.",
          "en": "I practiced piano yesterday.",
          "tags": [
            "car-yo"
          ]
        },
        {
          "es": "Yo jugué al fútbol.",
          "en": "I played soccer.",
          "tags": [
            "gar-yo"
          ]
        },
        {
          "es": "Yo organicé mis libros.",
          "en": "I organized my books.",
          "tags": [
            "zar-yo"
          ]
        }
      ],
      "vocab": [
        {
          "es": "caber",
          "en": "to fit",
          "pos": "verb"
        },
        {
          "es": "poder",
          "en": "to be able",
          "pos": "verb"
        },
        {
          "es": "saber",
          "en": "to know",
          "pos": "verb"
        },
        {
          "es": "querer",
          "en": "to want",
          "pos": "verb"
        },
        {
          "es": "ver",
          "en": "to see",
          "pos": "verb"
        },
        {
          "es": "dar",
          "en": "to give",
          "pos": "verb"
        },
        {
          "es": "preferir",
          "en": "to prefer",
          "pos": "verb"
        },
        {
          "es": "dormir",
          "en": "to sleep",
          "pos": "verb"
        },
        {
          "es": "morir",
          "en": "to die",
          "pos": "verb"
        },
        {
          "es": "leer",
          "en": "to read",
          "pos": "verb"
        },
        {
          "es": "creer",
          "en": "to believe",
          "pos": "verb"
        },
        {
          "es": "oír",
          "en": "to hear",
          "pos": "verb"
        },
        {
          "es": "practicar",
          "en": "to practice",
          "pos": "verb"
        },
        {
          "es": "jugar",
          "en": "to play",
          "pos": "verb"
        },
        {
          "es": "organizar",
          "en": "to organize",
          "pos": "verb"
        },
        {
          "es": "empezar",
          "en": "to start",
          "pos": "verb"
        },
        {
          "es": "llegar",
          "en": "to arrive",
          "pos": "verb"
        },
        {
          "es": "buscar",
          "en": "to look for",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "poder",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "pude",
            "tu": "pudiste",
            "el": "pudo",
            "nosotros": "pudimos",
            "vosotros": "pudisteis",
            "ellos": "pudieron"
          }
        },
        {
          "verb": "saber",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "supe",
            "tu": "supiste",
            "el": "supo",
            "nosotros": "supimos",
            "vosotros": "supisteis",
            "ellos": "supieron"
          }
        },
        {
          "verb": "querer",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "quise",
            "tu": "quisiste",
            "el": "quiso",
            "nosotros": "quisimos",
            "vosotros": "quisisteis",
            "ellos": "quisieron"
          }
        },
        {
          "verb": "caber",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "cupe",
            "tu": "cupiste",
            "el": "cupo",
            "nosotros": "cupimos",
            "vosotros": "cupisteis",
            "ellos": "cupieron"
          }
        },
        {
          "verb": "ver",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "vi",
            "tu": "viste",
            "el": "vio",
            "nosotros": "vimos",
            "vosotros": "visteis",
            "ellos": "vieron"
          }
        },
        {
          "verb": "dar",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "di",
            "tu": "diste",
            "el": "dio",
            "nosotros": "dimos",
            "vosotros": "disteis",
            "ellos": "dieron"
          }
        },
        {
          "verb": "dormir",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "dormí",
            "tu": "dormiste",
            "el": "durmió",
            "nosotros": "dormimos",
            "vosotros": "dormisteis",
            "ellos": "durmieron"
          }
        },
        {
          "verb": "pedir",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "pedí",
            "tu": "pediste",
            "el": "pidió",
            "nosotros": "pedimos",
            "vosotros": "pedisteis",
            "ellos": "pidieron"
          }
        },
        {
          "verb": "leer",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "leí",
            "tu": "leíste",
            "el": "leyó",
            "nosotros": "leímos",
            "vosotros": "leísteis",
            "ellos": "leyeron"
          }
        },
        {
          "verb": "oír",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "oí",
            "tu": "oíste",
            "el": "oyó",
            "nosotros": "oímos",
            "vosotros": "oísteis",
            "ellos": "oyeron"
          }
        },
        {
          "verb": "practicar",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "practiqué",
            "tu": "practicaste",
            "el": "practicó",
            "nosotros": "practicamos",
            "vosotros": "practicasteis",
            "ellos": "practicaron"
          }
        },
        {
          "verb": "jugar",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "jugué",
            "tu": "jugaste",
            "el": "jugó",
            "nosotros": "jugamos",
            "vosotros": "jugasteis",
            "ellos": "jugaron"
          }
        },
        {
          "verb": "organizar",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "organicé",
            "tu": "organizaste",
            "el": "organizó",
            "nosotros": "organizamos",
            "vosotros": "organizasteis",
            "ellos": "organizaron"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo no _____ ir a la fiesta. (poder)",
          "correct": "pude",
          "distractor": "podía",
          "explanation": "Preterite poder = pude (managed to / could). 'Podía' is imperfect."
        },
        {
          "sentence": "Ayer yo _____ que estás casado. (saber)",
          "correct": "supe",
          "distractor": "sabía",
          "explanation": "Preterite saber = supe and means 'I found out'. 'Sabía' = 'I knew (already)'."
        },
        {
          "sentence": "Ellos _____ ocho horas anoche. (dormir)",
          "correct": "durmieron",
          "distractor": "dormieron",
          "explanation": "dormir is a 3rd-person stem-changer: o→u in ellos: durmieron."
        },
        {
          "sentence": "Ella _____ una hamburguesa. (pedir)",
          "correct": "pidió",
          "distractor": "pedió",
          "explanation": "pedir is a 3rd-person stem-changer: e→i in él/ella: pidió."
        },
        {
          "sentence": "Yo _____ a mi amigo en la calle. (ver)",
          "correct": "vi",
          "distractor": "ví",
          "explanation": "Preterite ver = vi (no written accent)."
        },
        {
          "sentence": "Yo te _____ un regalo. (dar)",
          "correct": "di",
          "distractor": "dí",
          "explanation": "Preterite dar = di (no written accent)."
        },
        {
          "sentence": "Él _____ el periódico esta mañana. (leer)",
          "correct": "leyó",
          "distractor": "leió",
          "explanation": "leer takes y in 3rd person: leyó."
        },
        {
          "sentence": "Yo _____ al tenis ayer. (jugar)",
          "correct": "jugué",
          "distractor": "jugé",
          "explanation": "-gar verbs change yo to -gué: jugué."
        },
        {
          "sentence": "Yo _____ español por dos horas. (practicar)",
          "correct": "practiqué",
          "distractor": "practicé",
          "explanation": "-car verbs change yo to -qué: practiqué."
        },
        {
          "sentence": "Yo _____ a estudiar a las ocho. (empezar)",
          "correct": "empecé",
          "distractor": "empezé",
          "explanation": "-zar verbs change yo to -cé: empecé."
        }
      ],
      "caveats": "OCR severely garbled stems (e.g., 'pude' rendered as 'P', 'cupe' as 'cap'); reconstructed from standard irregular preterite tables."
    },
    {
      "chapter_id": "29",
      "slug": "reflexive-verbs",
      "title": "Reflexive Verbs",
      "time_range_sec": [
        7780,
        8149
      ],
      "summary": "Reflexive verbs apply the action to the subject itself; their infinitive ends in -se and they require a matching reflexive pronoun (me, te, se, nos, os, se) before the conjugated verb.",
      "suggested_grammar_note_id": "reflexive-verbs",
      "rules": [
        {
          "title": "Pronoun placement",
          "bullets": [
            "Reflexive pronoun goes before the conjugated verb.",
            "In progressive forms, place before estar (te estás lavando) or attached to the gerund with accent (lavándote)."
          ]
        },
        {
          "title": "Form the verb",
          "bullets": [
            "Drop -se from the infinitive and conjugate the base verb.",
            "Pronouns: me, te, se, nos, os, se."
          ]
        },
        {
          "title": "Meaning shift",
          "bullets": [
            "Adding -se often changes the meaning, similar to English particle verbs (give vs give up).",
            "Many daily-routine verbs are reflexive: bañarse, levantarse, despertarse, dormirse, vestirse."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo lavo el coche.",
          "en": "I wash the car.",
          "tags": [
            "non-reflexive"
          ]
        },
        {
          "es": "Yo me lavo las manos.",
          "en": "I wash up my hands.",
          "tags": [
            "reflexive",
            "present"
          ]
        },
        {
          "es": "Tú te estás lavando.",
          "en": "You are washing up.",
          "tags": [
            "progressive"
          ]
        },
        {
          "es": "Estás lavándote.",
          "en": "You are washing up.",
          "tags": [
            "progressive",
            "attached-pronoun"
          ]
        },
        {
          "es": "Él se lavó.",
          "en": "He washed up.",
          "tags": [
            "preterite"
          ]
        },
        {
          "es": "Yo me baño.",
          "en": "I take a bath.",
          "tags": [
            "present"
          ]
        },
        {
          "es": "Tú te levantaste.",
          "en": "You got up.",
          "tags": [
            "preterite"
          ]
        },
        {
          "es": "Él se despertó.",
          "en": "He woke up.",
          "tags": [
            "preterite"
          ]
        },
        {
          "es": "Yo me voy.",
          "en": "I leave / I go away.",
          "tags": [
            "irse"
          ]
        },
        {
          "es": "Yo me pongo el abrigo.",
          "en": "I put my coat on.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "Yo me siento.",
          "en": "I sit down.",
          "tags": [
            "stem-change"
          ]
        },
        {
          "es": "¿Cómo te llamas?",
          "en": "What is your name?",
          "tags": [
            "llamarse"
          ]
        },
        {
          "es": "Me llamo Alex.",
          "en": "My name is Alex.",
          "tags": [
            "llamarse"
          ]
        }
      ],
      "vocab": [
        {
          "es": "lavarse",
          "en": "to wash up",
          "pos": "verb"
        },
        {
          "es": "bañarse",
          "en": "to take a bath",
          "pos": "verb"
        },
        {
          "es": "levantarse",
          "en": "to get up",
          "pos": "verb"
        },
        {
          "es": "despertarse",
          "en": "to wake up",
          "pos": "verb"
        },
        {
          "es": "dormirse",
          "en": "to fall asleep",
          "pos": "verb"
        },
        {
          "es": "irse",
          "en": "to leave / go away",
          "pos": "verb"
        },
        {
          "es": "ponerse",
          "en": "to put on / put down",
          "pos": "verb"
        },
        {
          "es": "sentarse",
          "en": "to sit down",
          "pos": "verb"
        },
        {
          "es": "llamarse",
          "en": "to call oneself / to be named",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "lavarse",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "me lavo",
            "tu": "te lavas",
            "el": "se lava",
            "nosotros": "nos lavamos",
            "vosotros": "os laváis",
            "ellos": "se lavan"
          }
        },
        {
          "verb": "levantarse",
          "tense_id": "ind_preterito",
          "forms": {
            "yo": "me levanté",
            "tu": "te levantaste",
            "el": "se levantó",
            "nosotros": "nos levantamos",
            "vosotros": "os levantasteis",
            "ellos": "se levantaron"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ las manos antes de comer.",
          "correct": "me lavo",
          "distractor": "lavo",
          "explanation": "Lavarse needs the reflexive pronoun me when the action is on the subject."
        },
        {
          "sentence": "¿Cómo _____ llamas?",
          "correct": "te",
          "distractor": "se",
          "explanation": "Tú uses te."
        },
        {
          "sentence": "Ellos _____ despertaron temprano.",
          "correct": "se",
          "distractor": "nos",
          "explanation": "Ellos uses se."
        },
        {
          "sentence": "Nosotros _____ levantamos a las siete.",
          "correct": "nos",
          "distractor": "se",
          "explanation": "Nosotros uses nos."
        },
        {
          "sentence": "Estás _____ ahora mismo.",
          "correct": "lavándote",
          "distractor": "lavandote",
          "explanation": "When the pronoun attaches to the gerund, an accent is required to keep the stress."
        },
        {
          "sentence": "Yo _____ pongo el abrigo.",
          "correct": "me",
          "distractor": "te",
          "explanation": "Yo uses me."
        },
        {
          "sentence": "Él _____ fue de la fiesta.",
          "correct": "se",
          "distractor": "le",
          "explanation": "Irse requires the reflexive pronoun se for él."
        }
      ],
      "caveats": "OCR garbled many verb stems (banhar, banharse, leant, etc.); reconstructed using standard Spanish forms."
    },
    {
      "chapter_id": "30",
      "slug": "reciprocal-reflexive-verbs",
      "title": "Reciprocal Reflexive Verbs",
      "time_range_sec": [
        8149,
        8311
      ],
      "summary": "Reciprocal reflexives express an action shared between two or more subjects (each other), using only the plural reflexive pronouns nos, os, and se with a plural-subject verb.",
      "suggested_grammar_note_id": "reflexive-verbs",
      "rules": [
        {
          "title": "Plural pronouns only",
          "bullets": [
            "Use nos, os, or se before the plural-subject verb.",
            "Singular reflexive pronouns (me, te) cannot be reciprocal."
          ]
        },
        {
          "title": "Works in any tense",
          "bullets": [
            "Conjugate the verb normally for the plural subject in the desired tense; keep the reciprocal pronoun.",
            "Common in present, preterite, imperfect, and progressive."
          ]
        },
        {
          "title": "Disambiguation",
          "bullets": [
            "Add 'el uno al otro' / 'los unos a los otros' to force the 'each other' reading when reflexive vs reciprocal is ambiguous."
          ]
        }
      ],
      "examples": [
        {
          "es": "Nos ayudamos.",
          "en": "We help each other.",
          "tags": [
            "present"
          ]
        },
        {
          "es": "Ellos se abrazan.",
          "en": "They hug each other.",
          "tags": [
            "present"
          ]
        },
        {
          "es": "Nos estamos escuchando.",
          "en": "We are listening to each other.",
          "tags": [
            "progressive"
          ]
        },
        {
          "es": "John y yo nos conocimos.",
          "en": "John and I met (each other).",
          "tags": [
            "preterite"
          ]
        },
        {
          "es": "Los amigos se saludaron.",
          "en": "The friends greeted each other.",
          "tags": [
            "preterite"
          ]
        },
        {
          "es": "Nos encontramos en el cine cuando nos vimos.",
          "en": "We met at the cinema when we saw each other.",
          "tags": [
            "preterite",
            "two-verbs"
          ]
        },
        {
          "es": "Ustedes se ven todos los días.",
          "en": "You all see each other every day.",
          "tags": [
            "present"
          ]
        },
        {
          "es": "Mis padres se aman.",
          "en": "My parents love each other.",
          "tags": [
            "present"
          ]
        }
      ],
      "vocab": [
        {
          "es": "ayudarse",
          "en": "to help each other",
          "pos": "verb"
        },
        {
          "es": "abrazarse",
          "en": "to hug each other",
          "pos": "verb"
        },
        {
          "es": "saludarse",
          "en": "to greet each other",
          "pos": "verb"
        },
        {
          "es": "encontrarse",
          "en": "to meet/encounter each other",
          "pos": "verb"
        },
        {
          "es": "verse",
          "en": "to see each other",
          "pos": "verb"
        },
        {
          "es": "conocerse",
          "en": "to know/meet each other",
          "pos": "verb"
        },
        {
          "es": "escucharse",
          "en": "to listen to each other",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "ayudarse",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "—",
            "tu": "—",
            "el": "—",
            "nosotros": "nos ayudamos",
            "vosotros": "os ayudáis",
            "ellos": "se ayudan"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Mis hermanos _____ ayudan con la tarea.",
          "correct": "se",
          "distractor": "nos",
          "explanation": "Mis hermanos = ellos → se."
        },
        {
          "sentence": "Nosotros _____ vemos los domingos.",
          "correct": "nos",
          "distractor": "se",
          "explanation": "Nosotros uses nos."
        },
        {
          "sentence": "Ellos _____ saludaron en la calle.",
          "correct": "se",
          "distractor": "le",
          "explanation": "Reciprocal saludarse uses se for ellos."
        },
        {
          "sentence": "John y yo _____ conocimos en 2010.",
          "correct": "nos",
          "distractor": "se",
          "explanation": "Subject is 'we' → nos."
        },
        {
          "sentence": "Mis padres _____ aman mucho.",
          "correct": "se",
          "distractor": "nos",
          "explanation": "Mis padres = ellos → se."
        },
        {
          "sentence": "¿Vosotros _____ habláis a menudo?",
          "correct": "os",
          "distractor": "se",
          "explanation": "Vosotros uses os."
        }
      ],
      "caveats": "Many verbs in OCR were truncated (AUD, Salud, cont, ver); restored to ayudar, saludar, encontrar, ver."
    },
    {
      "chapter_id": "31",
      "slug": "imperfect-tense",
      "title": "Imperfect Tense",
      "time_range_sec": [
        8311,
        8722
      ],
      "summary": "The imperfect describes habitual or ongoing actions in the past ('used to' / 'was -ing'); it has just two regular ending sets (-ar vs -er/-ir) and only three irregulars: ser, ir, ver.",
      "suggested_grammar_note_id": "preterite-vs-imperfect",
      "rules": [
        {
          "title": "When to use",
          "bullets": [
            "Habits in the past ('I used to...').",
            "Background or ongoing past action ('was/were -ing').",
            "Descriptions: age, time, weather, traits, mental/emotional states."
          ]
        },
        {
          "title": "Endings",
          "bullets": [
            "-ar verbs: -aba, -abas, -aba, -ábamos, -abais, -aban.",
            "-er and -ir verbs share: -ía, -ías, -ía, -íamos, -íais, -ían."
          ]
        },
        {
          "title": "Irregulars",
          "bullets": [
            "Only three: ser → era, ir → iba, ver → veía.",
            "No stem changes anywhere else."
          ]
        },
        {
          "title": "Past progressive",
          "bullets": [
            "Use estar in the imperfect + gerund: yo estaba hablando.",
            "Never use the preterite of estar for ongoing background action."
          ]
        },
        {
          "title": "Vs preterite",
          "bullets": [
            "Preterite = a single completed event ('I went, I ate').",
            "Imperfect = habit / background / description ('I used to go, I was eating')."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo hablaba español de niño.",
          "en": "I used to speak Spanish as a kid.",
          "tags": [
            "habit"
          ]
        },
        {
          "es": "Tú caminabas cada día.",
          "en": "You used to walk every day.",
          "tags": [
            "habit"
          ]
        },
        {
          "es": "Él comía por las mañanas.",
          "en": "He used to eat in the mornings.",
          "tags": [
            "habit"
          ]
        },
        {
          "es": "Nosotros vivíamos en Madrid.",
          "en": "We used to live in Madrid.",
          "tags": [
            "habit"
          ]
        },
        {
          "es": "Yo iba a la escuela todos los días.",
          "en": "I used to go to school every day.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "Yo era estudiante.",
          "en": "I used to be a student.",
          "tags": [
            "ser",
            "trait"
          ]
        },
        {
          "es": "Él era rápido.",
          "en": "He used to be fast.",
          "tags": [
            "ser",
            "trait"
          ]
        },
        {
          "es": "Yo veía la televisión.",
          "en": "I used to watch TV.",
          "tags": [
            "ver"
          ]
        },
        {
          "es": "Yo estaba hablando con María.",
          "en": "I was speaking with María.",
          "tags": [
            "progressive"
          ]
        },
        {
          "es": "Tú estabas muy feliz.",
          "en": "You were very happy.",
          "tags": [
            "estar"
          ]
        },
        {
          "es": "Eran las tres de la tarde.",
          "en": "It was 3 in the afternoon.",
          "tags": [
            "time"
          ]
        },
        {
          "es": "Hacía frío y llovía.",
          "en": "It was cold and raining.",
          "tags": [
            "weather"
          ]
        }
      ],
      "vocab": [
        {
          "es": "siempre",
          "en": "always",
          "pos": "adv"
        },
        {
          "es": "cada día",
          "en": "every day",
          "pos": "phrase"
        },
        {
          "es": "todos los días",
          "en": "every day",
          "pos": "phrase"
        },
        {
          "es": "a menudo",
          "en": "often",
          "pos": "adv"
        },
        {
          "es": "mientras",
          "en": "while",
          "pos": "adv"
        },
        {
          "es": "de niño/a",
          "en": "as a child",
          "pos": "phrase"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "ind_imperfecto",
          "forms": {
            "yo": "hablaba",
            "tu": "hablabas",
            "el": "hablaba",
            "nosotros": "hablábamos",
            "vosotros": "hablabais",
            "ellos": "hablaban"
          }
        },
        {
          "verb": "comer",
          "tense_id": "ind_imperfecto",
          "forms": {
            "yo": "comía",
            "tu": "comías",
            "el": "comía",
            "nosotros": "comíamos",
            "vosotros": "comíais",
            "ellos": "comían"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "ind_imperfecto",
          "forms": {
            "yo": "vivía",
            "tu": "vivías",
            "el": "vivía",
            "nosotros": "vivíamos",
            "vosotros": "vivíais",
            "ellos": "vivían"
          }
        },
        {
          "verb": "ser",
          "tense_id": "ind_imperfecto",
          "forms": {
            "yo": "era",
            "tu": "eras",
            "el": "era",
            "nosotros": "éramos",
            "vosotros": "erais",
            "ellos": "eran"
          }
        },
        {
          "verb": "ir",
          "tense_id": "ind_imperfecto",
          "forms": {
            "yo": "iba",
            "tu": "ibas",
            "el": "iba",
            "nosotros": "íbamos",
            "vosotros": "ibais",
            "ellos": "iban"
          }
        },
        {
          "verb": "ver",
          "tense_id": "ind_imperfecto",
          "forms": {
            "yo": "veía",
            "tu": "veías",
            "el": "veía",
            "nosotros": "veíamos",
            "vosotros": "veíais",
            "ellos": "veían"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Cuando era niño, _____ al parque todos los días.",
          "correct": "iba",
          "distractor": "fui",
          "explanation": "Habitual past action → imperfect of ir."
        },
        {
          "sentence": "Mientras yo _____, sonó el teléfono.",
          "correct": "comía",
          "distractor": "comí",
          "explanation": "Background ongoing action → imperfect."
        },
        {
          "sentence": "Cuando éramos jóvenes, nosotros _____ en Madrid.",
          "correct": "vivíamos",
          "distractor": "vivimos",
          "explanation": "Habitual past → imperfect of vivir."
        },
        {
          "sentence": "_____ las cinco cuando llegó.",
          "correct": "Eran",
          "distractor": "Fueron",
          "explanation": "Time in the past always uses imperfect of ser."
        },
        {
          "sentence": "Mi abuela _____ mucho la tele.",
          "correct": "veía",
          "distractor": "vio",
          "explanation": "Habit → imperfect of ver."
        },
        {
          "sentence": "Yo _____ hablando cuando entró.",
          "correct": "estaba",
          "distractor": "estuve",
          "explanation": "Past progressive needs estar in the imperfect."
        },
        {
          "sentence": "Él _____ muy alto de joven.",
          "correct": "era",
          "distractor": "fue",
          "explanation": "Trait/description → imperfect of ser."
        },
        {
          "sentence": "Tú siempre _____ pan en la panadería.",
          "correct": "comprabas",
          "distractor": "compraste",
          "explanation": "'Siempre' + habitual action → imperfect."
        }
      ],
      "caveats": "OCR mangled accents and verb stems heavily; rebuilt all paradigms from standard imperfect rules."
    },
    {
      "chapter_id": "32",
      "slug": "stressed-possessive-adjectives",
      "title": "Stressed Possessive Adjectives",
      "time_range_sec": [
        8722,
        8879
      ],
      "summary": "Stressed possessive adjectives (mío, tuyo, suyo, nuestro, vuestro) indicate ownership and follow the noun or ser; they agree in gender and number with the possessed noun.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Placement",
          "bullets": [
            "Go after the noun (un amigo mío) or after ser (el libro es mío).",
            "Equivalent meaning to unstressed forms before the noun (tu cuaderno = el cuaderno tuyo)."
          ]
        },
        {
          "title": "Agreement",
          "bullets": [
            "Match the gender (m/f) and number (sg/pl) of the possessed noun, not the owner."
          ]
        },
        {
          "title": "Suyo ambiguity",
          "bullets": [
            "Suyo/a(s) can mean his, hers, yours (formal), or theirs.",
            "Clarify with de él / de ella / de usted / de ellos / de ellas."
          ]
        }
      ],
      "examples": [
        {
          "es": "El libro es mío.",
          "en": "The book is mine.",
          "tags": [
            "predicate"
          ]
        },
        {
          "es": "John es un amigo mío.",
          "en": "John is a friend of mine.",
          "tags": [
            "after-noun"
          ]
        },
        {
          "es": "La computadora tuya es rápida.",
          "en": "Your computer is fast.",
          "tags": [
            "fem"
          ]
        },
        {
          "es": "La clase nuestra empieza ahora.",
          "en": "Our class starts now.",
          "tags": [
            "fem"
          ]
        },
        {
          "es": "Las clases nuestras son largas.",
          "en": "Our classes are long.",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "El teclado suyo.",
          "en": "His/her/their keyboard.",
          "tags": [
            "ambiguous"
          ]
        },
        {
          "es": "El teclado de él.",
          "en": "His keyboard.",
          "tags": [
            "clarification"
          ]
        },
        {
          "es": "Estos zapatos son míos.",
          "en": "These shoes are mine.",
          "tags": [
            "plural",
            "predicate"
          ]
        },
        {
          "es": "Una idea tuya cambió todo.",
          "en": "An idea of yours changed everything.",
          "tags": [
            "fem"
          ]
        },
        {
          "es": "Los planes vuestros son interesantes.",
          "en": "Your (pl.) plans are interesting.",
          "tags": [
            "vosotros"
          ]
        }
      ],
      "vocab": [
        {
          "es": "mío/a",
          "en": "mine",
          "pos": "adj"
        },
        {
          "es": "tuyo/a",
          "en": "yours (tú)",
          "pos": "adj"
        },
        {
          "es": "suyo/a",
          "en": "his/hers/yours/theirs",
          "pos": "adj"
        },
        {
          "es": "nuestro/a",
          "en": "ours",
          "pos": "adj"
        },
        {
          "es": "vuestro/a",
          "en": "yours (vosotros)",
          "pos": "adj"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Estos libros son _____ (mine).",
          "correct": "míos",
          "distractor": "mío",
          "explanation": "Plural masculine noun (libros) → míos."
        },
        {
          "sentence": "La casa es _____ (ours).",
          "correct": "nuestra",
          "distractor": "nuestro",
          "explanation": "Casa is feminine singular → nuestra."
        },
        {
          "sentence": "Una amiga _____ (of mine) llegó ayer.",
          "correct": "mía",
          "distractor": "mío",
          "explanation": "Amiga is feminine → mía."
        },
        {
          "sentence": "Los problemas son _____ (theirs).",
          "correct": "suyos",
          "distractor": "suya",
          "explanation": "Problemas is masc. plural → suyos."
        },
        {
          "sentence": "El coche _____ (of yours, tú) es nuevo.",
          "correct": "tuyo",
          "distractor": "tuya",
          "explanation": "Coche is masc. sing. → tuyo."
        },
        {
          "sentence": "Las ideas _____ (yours, vosotros) son buenas.",
          "correct": "vuestras",
          "distractor": "vuestros",
          "explanation": "Ideas is fem. plural → vuestras."
        }
      ],
      "caveats": "OCR muddled forms but standard paradigm restored."
    },
    {
      "chapter_id": "33",
      "slug": "por-para",
      "title": "Por & Para",
      "time_range_sec": [
        8879,
        9252
      ],
      "summary": "Por and para both can translate as 'for' but cover distinct meanings: por handles motion through, duration, cause, exchange, rate, and idioms; para handles destination, deadline, purpose, recipient, comparison, and employer.",
      "suggested_grammar_note_id": "por-vs-para",
      "rules": [
        {
          "title": "Por uses",
          "bullets": [
            "Movement: by/through.",
            "Duration: during/for a period.",
            "Reason: because of.",
            "In search of.",
            "Exchange: in exchange for.",
            "Per (units of measurement).",
            "Idiomatic expressions (por ejemplo, por fin, por eso, por aquí)."
          ]
        },
        {
          "title": "Para uses",
          "bullets": [
            "Destination (movement toward).",
            "Deadline (time goal).",
            "Purpose: in order to.",
            "Recipient of something.",
            "Comparison or opinion (para mí…).",
            "Employer (work for)."
          ]
        },
        {
          "title": "Mental shortcut",
          "bullets": [
            "Por = looks back: cause, route, duration.",
            "Para = looks forward: goal, destination, endpoint."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo fui por el parque.",
          "en": "I went through the park.",
          "tags": [
            "por",
            "movement"
          ]
        },
        {
          "es": "Yo lo hice por dos horas.",
          "en": "I did it for two hours.",
          "tags": [
            "por",
            "duration"
          ]
        },
        {
          "es": "Llegué tarde por el tráfico.",
          "en": "I got there late because of the traffic.",
          "tags": [
            "por",
            "reason"
          ]
        },
        {
          "es": "Yo fui por mi lápiz.",
          "en": "I went for my pencil.",
          "tags": [
            "por",
            "search"
          ]
        },
        {
          "es": "Te di dinero por el boleto.",
          "en": "I gave you money for the ticket.",
          "tags": [
            "por",
            "exchange"
          ]
        },
        {
          "es": "Conducía 120 kilómetros por hora.",
          "en": "I was driving 120 km per hour.",
          "tags": [
            "por",
            "rate"
          ]
        },
        {
          "es": "Por ejemplo, este libro.",
          "en": "For example, this book.",
          "tags": [
            "por",
            "idiom"
          ]
        },
        {
          "es": "Por fin llegamos.",
          "en": "At last we arrived.",
          "tags": [
            "por",
            "idiom"
          ]
        },
        {
          "es": "Yo salgo para Las Vegas el lunes.",
          "en": "I leave for Las Vegas on Monday.",
          "tags": [
            "para",
            "destination"
          ]
        },
        {
          "es": "Lo voy a hacer para el viernes.",
          "en": "I'm going to do it by Friday.",
          "tags": [
            "para",
            "deadline"
          ]
        },
        {
          "es": "Yo estudio español para ser profesor.",
          "en": "I study Spanish to be a teacher.",
          "tags": [
            "para",
            "purpose"
          ]
        },
        {
          "es": "Este regalo es para él.",
          "en": "This gift is for him.",
          "tags": [
            "para",
            "recipient"
          ]
        },
        {
          "es": "Para mí, esta lección es fácil.",
          "en": "For me, this lesson is easy.",
          "tags": [
            "para",
            "opinion"
          ]
        },
        {
          "es": "Ella trabaja para Telecom.",
          "en": "She works for Telecom.",
          "tags": [
            "para",
            "employer"
          ]
        }
      ],
      "vocab": [
        {
          "es": "por",
          "en": "by, through, during, for (because of), per",
          "pos": "phrase"
        },
        {
          "es": "para",
          "en": "for, in order to, by (deadline), toward",
          "pos": "phrase"
        },
        {
          "es": "por ejemplo",
          "en": "for example",
          "pos": "phrase"
        },
        {
          "es": "por fin",
          "en": "at last",
          "pos": "phrase"
        },
        {
          "es": "por eso",
          "en": "that's why",
          "pos": "phrase"
        },
        {
          "es": "por aquí",
          "en": "around here",
          "pos": "phrase"
        },
        {
          "es": "para que",
          "en": "so that",
          "pos": "phrase"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Caminé _____ el parque ayer.",
          "correct": "por",
          "distractor": "para",
          "explanation": "Movement through a place uses por."
        },
        {
          "sentence": "Este regalo es _____ ti.",
          "correct": "para",
          "distractor": "por",
          "explanation": "Recipient uses para."
        },
        {
          "sentence": "Estudio mucho _____ aprobar el examen.",
          "correct": "para",
          "distractor": "por",
          "explanation": "Purpose / in order to uses para."
        },
        {
          "sentence": "Llegué tarde _____ el tráfico.",
          "correct": "por",
          "distractor": "para",
          "explanation": "Reason / because of uses por."
        },
        {
          "sentence": "Trabajé _____ ocho horas.",
          "correct": "por",
          "distractor": "para",
          "explanation": "Duration uses por."
        },
        {
          "sentence": "Necesito el informe _____ el lunes.",
          "correct": "para",
          "distractor": "por",
          "explanation": "Deadline uses para."
        },
        {
          "sentence": "Pagué cien dólares _____ esta camisa.",
          "correct": "por",
          "distractor": "para",
          "explanation": "Exchange uses por."
        },
        {
          "sentence": "_____ mí, el español es fácil.",
          "correct": "Para",
          "distractor": "Por",
          "explanation": "Personal opinion uses para."
        },
        {
          "sentence": "Mi hermana trabaja _____ Google.",
          "correct": "para",
          "distractor": "por",
          "explanation": "Employer uses para."
        },
        {
          "sentence": "Conducimos a 100 km _____ hora.",
          "correct": "por",
          "distractor": "para",
          "explanation": "Per / rate uses por."
        }
      ],
      "caveats": "Many spoken examples were truncated in OCR (Y, YOLO, sentence ending dropped); reconstructed from the on-screen Spanish lines."
    },
    {
      "chapter_id": "34",
      "slug": "comparatives-superlatives",
      "title": "Comparatives & Superlatives",
      "time_range_sec": [
        9252,
        9567
      ],
      "summary": "Spanish forms comparatives with más/menos + adjective and superlatives by adding a definite article before más/menos; four common irregulars are mejor, peor, mayor, menor.",
      "suggested_grammar_note_id": "comparatives-superlatives",
      "rules": [
        {
          "title": "Comparative",
          "bullets": [
            "Pattern: más/menos + adjective (+ que + reference).",
            "Adjective agrees in gender and number with the noun."
          ]
        },
        {
          "title": "Superlative",
          "bullets": [
            "Pattern: el/la/los/las + (noun) + más/menos + adjective.",
            "Article matches the noun's gender and number."
          ]
        },
        {
          "title": "Equality",
          "bullets": [
            "tan + adjective + como = as … as.",
            "tanto/a/os/as + noun + como for nouns."
          ]
        },
        {
          "title": "Que vs de",
          "bullets": [
            "Use 'que' to compare two things: más alto que su hermano.",
            "Use 'de' before numbers: más de cinco, menos de veinte."
          ]
        },
        {
          "title": "Irregulars",
          "bullets": [
            "bueno → mejor / el mejor.",
            "malo → peor / el peor.",
            "joven → menor / el menor (mostly for age).",
            "viejo → mayor / el mayor (mostly for age)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Esta clase es más pequeña.",
          "en": "This class is smaller.",
          "tags": [
            "comparative"
          ]
        },
        {
          "es": "Esta clase es la más pequeña.",
          "en": "This class is the smallest.",
          "tags": [
            "superlative"
          ]
        },
        {
          "es": "Esta camisa es más cara que la otra.",
          "en": "This shirt is more expensive than the other one.",
          "tags": [
            "comparative",
            "que"
          ]
        },
        {
          "es": "Esta camisa es la menos cara.",
          "en": "This shirt is the least expensive.",
          "tags": [
            "superlative",
            "menos"
          ]
        },
        {
          "es": "Esta lección es mejor.",
          "en": "This lesson is better.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "Esta lección es la mejor.",
          "en": "This lesson is the best.",
          "tags": [
            "irregular",
            "superlative"
          ]
        },
        {
          "es": "Este libro es peor que aquel.",
          "en": "This book is worse than that one.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "El niño es el menor.",
          "en": "The boy is the youngest.",
          "tags": [
            "irregular",
            "age"
          ]
        },
        {
          "es": "Ella es la mayor de la familia.",
          "en": "She is the oldest in the family.",
          "tags": [
            "irregular",
            "age"
          ]
        },
        {
          "es": "Tengo más de cinco libros.",
          "en": "I have more than five books.",
          "tags": [
            "de",
            "number"
          ]
        },
        {
          "es": "Ana es tan alta como María.",
          "en": "Ana is as tall as María.",
          "tags": [
            "equality"
          ]
        },
        {
          "es": "Esta casa tiene menos habitaciones que la mía.",
          "en": "This house has fewer rooms than mine.",
          "tags": [
            "nouns"
          ]
        }
      ],
      "vocab": [
        {
          "es": "más",
          "en": "more / most",
          "pos": "adv"
        },
        {
          "es": "menos",
          "en": "less / least",
          "pos": "adv"
        },
        {
          "es": "que",
          "en": "than",
          "pos": "phrase"
        },
        {
          "es": "tan…como",
          "en": "as…as",
          "pos": "phrase"
        },
        {
          "es": "mejor",
          "en": "better / best",
          "pos": "adj"
        },
        {
          "es": "peor",
          "en": "worse / worst",
          "pos": "adj"
        },
        {
          "es": "mayor",
          "en": "older / oldest",
          "pos": "adj"
        },
        {
          "es": "menor",
          "en": "younger / youngest",
          "pos": "adj"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Mi coche es _____ rápido que el tuyo.",
          "correct": "más",
          "distractor": "muy",
          "explanation": "Comparison uses más + adjective + que."
        },
        {
          "sentence": "Esta es _____ mejor película del año.",
          "correct": "la",
          "distractor": "más",
          "explanation": "Mejor is irregular; superlative just needs the article."
        },
        {
          "sentence": "Tengo más _____ veinte libros.",
          "correct": "de",
          "distractor": "que",
          "explanation": "Before a number use de, not que."
        },
        {
          "sentence": "Ana es tan inteligente _____ Luis.",
          "correct": "como",
          "distractor": "que",
          "explanation": "Equality: tan…como."
        },
        {
          "sentence": "Mi abuela es la _____ de mis abuelas.",
          "correct": "mayor",
          "distractor": "más vieja",
          "explanation": "For age, use mayor (more polite/standard)."
        },
        {
          "sentence": "Este examen fue _____ que el anterior.",
          "correct": "peor",
          "distractor": "más malo",
          "explanation": "Irregular comparative of malo is peor."
        },
        {
          "sentence": "Ella es la _____ de la clase.",
          "correct": "menor",
          "distractor": "más joven",
          "explanation": "Both are accepted, but menor is the standard irregular."
        },
        {
          "sentence": "Esta casa tiene _____ habitaciones que la mía.",
          "correct": "menos",
          "distractor": "menor",
          "explanation": "Use menos to mean 'fewer' before nouns."
        }
      ],
      "caveats": "OCR repeatedly garbled menos/más, mayor/menor; reconstructed from the on-screen labels and standard grammar."
    },
    {
      "chapter_id": "35",
      "slug": "how-negatives-work",
      "title": "How Negatives Work",
      "time_range_sec": [
        9567,
        9830
      ],
      "summary": "Spanish negates with 'no' before the verb and freely uses double or triple negatives; when a negative word (nada, nadie, nunca, ningún, tampoco) follows the verb, 'no' must precede the verb.",
      "suggested_grammar_note_id": "double-negatives",
      "rules": [
        {
          "title": "Basic negation",
          "bullets": [
            "Place 'no' directly before the conjugated verb.",
            "Subject pronouns (if used) come before 'no': Yo no como."
          ]
        },
        {
          "title": "Double negatives",
          "bullets": [
            "If a negative word follows the verb, keep 'no' before the verb: No como nada.",
            "If the negative word goes before the verb, drop the 'no': Nada como (or Nunca como)."
          ]
        },
        {
          "title": "Personal a",
          "bullets": [
            "Use 'a' with alguien / nadie when they are direct objects: ¿Viste a alguien? — No vi a nadie."
          ]
        },
        {
          "title": "Algún / ningún",
          "bullets": [
            "Drop the final -o before a singular masculine noun: algún libro, ningún problema.",
            "Full forms: alguno/a/os/as, ninguno/a (singular preferred).",
            "Both agree in gender; ninguno is usually singular in modern Spanish."
          ]
        },
        {
          "title": "Other pairs",
          "bullets": [
            "también ↔ tampoco.",
            "siempre ↔ nunca / jamás.",
            "o…o ↔ ni…ni."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo no hablo francés.",
          "en": "I do not speak French.",
          "tags": [
            "basic"
          ]
        },
        {
          "es": "Él no habla italiano.",
          "en": "He does not speak Italian.",
          "tags": [
            "basic"
          ]
        },
        {
          "es": "Nadie come.",
          "en": "Nobody eats.",
          "tags": [
            "pre-verb-negative"
          ]
        },
        {
          "es": "Ella nunca corre.",
          "en": "She never runs.",
          "tags": [
            "pre-verb-negative"
          ]
        },
        {
          "es": "Yo no como nada.",
          "en": "I don't eat anything.",
          "tags": [
            "double-negative"
          ]
        },
        {
          "es": "Tú nunca comes nada.",
          "en": "You never eat anything.",
          "tags": [
            "double-negative"
          ]
        },
        {
          "es": "Él no sabe nada.",
          "en": "He doesn't know anything.",
          "tags": [
            "double-negative"
          ]
        },
        {
          "es": "No vi a nadie.",
          "en": "I didn't see anyone.",
          "tags": [
            "personal-a"
          ]
        },
        {
          "es": "No tengo ningún libro aquí.",
          "en": "I don't have any book here.",
          "tags": [
            "ningún"
          ]
        },
        {
          "es": "No conozco ninguna tienda por aquí.",
          "en": "I don't know any store around here.",
          "tags": [
            "ninguna"
          ]
        },
        {
          "es": "Yo tampoco.",
          "en": "Me neither.",
          "tags": [
            "tampoco"
          ]
        },
        {
          "es": "No quiero ni café ni té.",
          "en": "I want neither coffee nor tea.",
          "tags": [
            "ni-ni"
          ]
        },
        {
          "es": "Jamás volveré allí.",
          "en": "I will never go back there.",
          "tags": [
            "jamás"
          ]
        }
      ],
      "vocab": [
        {
          "es": "no",
          "en": "no, not",
          "pos": "adv"
        },
        {
          "es": "nada",
          "en": "nothing",
          "pos": "phrase"
        },
        {
          "es": "nadie",
          "en": "no one",
          "pos": "phrase"
        },
        {
          "es": "nunca",
          "en": "never",
          "pos": "adv"
        },
        {
          "es": "jamás",
          "en": "never (emphatic)",
          "pos": "adv"
        },
        {
          "es": "ningún / ninguno/a",
          "en": "not any, none",
          "pos": "adj"
        },
        {
          "es": "tampoco",
          "en": "neither, not either",
          "pos": "adv"
        },
        {
          "es": "ni…ni",
          "en": "neither…nor",
          "pos": "phrase"
        },
        {
          "es": "algo",
          "en": "something",
          "pos": "phrase"
        },
        {
          "es": "alguien",
          "en": "someone",
          "pos": "phrase"
        },
        {
          "es": "algún / alguno/a(s)",
          "en": "any, some",
          "pos": "adj"
        },
        {
          "es": "siempre",
          "en": "always",
          "pos": "adv"
        },
        {
          "es": "también",
          "en": "also",
          "pos": "adv"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Yo _____ como pescado.",
          "correct": "no",
          "distractor": "nada",
          "explanation": "Basic negation puts 'no' before the verb."
        },
        {
          "sentence": "No conozco _____ aquí.",
          "correct": "a nadie",
          "distractor": "nadie",
          "explanation": "Direct-object person needs personal a: a nadie."
        },
        {
          "sentence": "Ella _____ llega tarde.",
          "correct": "nunca",
          "distractor": "no nunca",
          "explanation": "When the negative word goes before the verb, no extra 'no' is needed."
        },
        {
          "sentence": "No tengo _____ libro sobre eso.",
          "correct": "ningún",
          "distractor": "ninguno",
          "explanation": "Before a singular masc. noun, use the apocopated ningún."
        },
        {
          "sentence": "—Yo no quiero ir. —Yo _____.",
          "correct": "tampoco",
          "distractor": "también",
          "explanation": "Negative agreement uses tampoco (me neither)."
        },
        {
          "sentence": "No quiero _____ café _____ té.",
          "correct": "ni / ni",
          "distractor": "o / o",
          "explanation": "Negative pair is ni…ni."
        },
        {
          "sentence": "¿Viste a _____ en la fiesta? — No, no vi a _____.",
          "correct": "alguien / nadie",
          "distractor": "nadie / alguien",
          "explanation": "Use alguien in the question and nadie in the negative answer."
        },
        {
          "sentence": "Ellos no comen _____ por la mañana.",
          "correct": "nada",
          "distractor": "no",
          "explanation": "Double negative: 'no…nada' = don't eat anything."
        }
      ],
      "caveats": "OCR garbled accented letters (vía → via, fui → fui) and dropped some pronouns; sentences were rebuilt to match the on-screen Spanish."
    },
    {
      "chapter_id": "36",
      "slug": "familiar-tu-commands",
      "title": "Familiar Tú Commands",
      "time_range_sec": [
        9830,
        10250
      ],
      "summary": "Tú commands are the singular informal way to give orders. Affirmative regulars use the él form of the present; negatives drop the ending and add -es/-as with no.",
      "suggested_grammar_note_id": "commands-imperative",
      "rules": [
        {
          "title": "Regular affirmative tú commands",
          "bullets": [
            "Use the third-person singular (él) of the present indicative.",
            "hablar → habla, comer → come, vivir → vive.",
            "No subject pronoun is needed."
          ]
        },
        {
          "title": "Regular negative tú commands",
          "bullets": [
            "-ar verbs: drop -ar, add -es, prepend no (habla → no hables).",
            "-er/-ir verbs: drop ending, add -as, prepend no (come → no comas).",
            "Stem changes are preserved."
          ]
        },
        {
          "title": "Irregular affirmatives",
          "bullets": [
            "Memorize: ven, di, sal, haz, ten, ve, pon, sé.",
            "ir → ve and ver → ve are identical; if a follows, it is ir (ve a la escuela)."
          ]
        },
        {
          "title": "Irregular negatives",
          "bullets": [
            "Irregular yo verbs: take yo stem + -as (no digas, no hagas, no pongas, no salgas, no traigas, no vengas, no veas, no conduzcas).",
            "-car/-gar/-zar spelling change: practicar→no practiques, jugar→no juegues, organizar→no organices.",
            "Other irregulars: no des, no seas, no estés, no vayas, no sepas."
          ]
        },
        {
          "title": "Object pronouns and reflexives",
          "bullets": [
            "Affirmative: attach pronouns to the verb (add accent if needed): dímelo, ponlo, levántate.",
            "Negative: pronouns go before the verb: no me lo digas, no te levantes.",
            "Reflexive tú commands always use te."
          ]
        }
      ],
      "examples": [
        {
          "es": "¡Habla ahora!",
          "en": "Speak now!",
          "tags": [
            "affirmative",
            "regular"
          ]
        },
        {
          "es": "¡No hables!",
          "en": "Don't speak!",
          "tags": [
            "negative",
            "regular"
          ]
        },
        {
          "es": "¡Come tu comida!",
          "en": "Eat your food!",
          "tags": [
            "affirmative",
            "-er"
          ]
        },
        {
          "es": "¡Abre la puerta, por favor!",
          "en": "Open the door, please.",
          "tags": [
            "affirmative",
            "-ir"
          ]
        },
        {
          "es": "Pon tu teléfono en la mesa.",
          "en": "Put your phone on the table.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "Haz tu tarea.",
          "en": "Do your homework.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "Ven si puedes.",
          "en": "Come if you can.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "Ve a la escuela.",
          "en": "Go to the school.",
          "tags": [
            "irregular",
            "ir"
          ]
        },
        {
          "es": "¡Dímelo!",
          "en": "Tell it to me!",
          "tags": [
            "pronouns"
          ]
        },
        {
          "es": "¡No me lo digas!",
          "en": "Don't tell me it!",
          "tags": [
            "pronouns",
            "negative"
          ]
        },
        {
          "es": "¡Levántate!",
          "en": "Get up!",
          "tags": [
            "reflexive"
          ]
        },
        {
          "es": "¡No te levantes!",
          "en": "Don't get up!",
          "tags": [
            "reflexive",
            "negative"
          ]
        },
        {
          "es": "¡Duérmete!",
          "en": "Fall asleep!",
          "tags": [
            "reflexive",
            "stem-change"
          ]
        },
        {
          "es": "¡No te duermas!",
          "en": "Don't fall asleep!",
          "tags": [
            "reflexive",
            "negative"
          ]
        }
      ],
      "vocab": [
        {
          "es": "decir",
          "en": "to say/tell",
          "pos": "verb"
        },
        {
          "es": "hacer",
          "en": "to do/make",
          "pos": "verb"
        },
        {
          "es": "poner",
          "en": "to put",
          "pos": "verb"
        },
        {
          "es": "salir",
          "en": "to leave",
          "pos": "verb"
        },
        {
          "es": "tener",
          "en": "to have",
          "pos": "verb"
        },
        {
          "es": "venir",
          "en": "to come",
          "pos": "verb"
        },
        {
          "es": "levantarse",
          "en": "to get up",
          "pos": "verb"
        },
        {
          "es": "dormirse",
          "en": "to fall asleep",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "imp_afirmativo",
          "forms": {
            "yo": "—",
            "tu": "habla",
            "el": "hable",
            "nosotros": "hablemos",
            "vosotros": "hablad",
            "ellos": "hablen"
          }
        },
        {
          "verb": "hablar",
          "tense_id": "imp_negativo",
          "forms": {
            "yo": "—",
            "tu": "no hables",
            "el": "no hable",
            "nosotros": "no hablemos",
            "vosotros": "no habléis",
            "ellos": "no hablen"
          }
        },
        {
          "verb": "comer",
          "tense_id": "imp_afirmativo",
          "forms": {
            "yo": "—",
            "tu": "come",
            "el": "coma",
            "nosotros": "comamos",
            "vosotros": "comed",
            "ellos": "coman"
          }
        },
        {
          "verb": "comer",
          "tense_id": "imp_negativo",
          "forms": {
            "yo": "—",
            "tu": "no comas",
            "el": "no coma",
            "nosotros": "no comamos",
            "vosotros": "no comáis",
            "ellos": "no coman"
          }
        },
        {
          "verb": "tener",
          "tense_id": "imp_afirmativo",
          "forms": {
            "yo": "—",
            "tu": "ten",
            "el": "tenga",
            "nosotros": "tengamos",
            "vosotros": "tened",
            "ellos": "tengan"
          }
        },
        {
          "verb": "tener",
          "tense_id": "imp_negativo",
          "forms": {
            "yo": "—",
            "tu": "no tengas",
            "el": "no tenga",
            "nosotros": "no tengamos",
            "vosotros": "no tengáis",
            "ellos": "no tengan"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "(hablar) tú: ¡_____ más despacio!",
          "correct": "habla",
          "distractor": "hable",
          "explanation": "Affirmative tú of regular -ar uses the él form of the present."
        },
        {
          "sentence": "Negative of 'come': ¡No _____!",
          "correct": "comas",
          "distractor": "comes",
          "explanation": "Negative tú of -er drops -er and adds -as."
        },
        {
          "sentence": "Irregular tú command of 'venir': ¡_____ aquí!",
          "correct": "ven",
          "distractor": "viene",
          "explanation": "Venir has the irregular tú command 'ven'."
        },
        {
          "sentence": "¡_____ tu tarea! (hacer)",
          "correct": "Haz",
          "distractor": "Hace",
          "explanation": "Hacer's irregular affirmative is 'haz'."
        },
        {
          "sentence": "Negative: ¡No _____ eso! (decir)",
          "correct": "digas",
          "distractor": "dices",
          "explanation": "Take the yo stem 'dig-' + -as."
        },
        {
          "sentence": "¡_____ ahora! (levantarse)",
          "correct": "Levántate",
          "distractor": "Te levanta",
          "explanation": "Affirmative reflexive: pronoun attaches to verb with accent."
        },
        {
          "sentence": "Negative: ¡No te _____! (dormirse)",
          "correct": "duermas",
          "distractor": "duermes",
          "explanation": "Negative tú of -ir uses -as, stem-change kept (o→ue)."
        },
        {
          "sentence": "¡_____! (Tell it to me, decir)",
          "correct": "Dímelo",
          "distractor": "Me lo dice",
          "explanation": "Attach IOP me + DOP lo to 'di' with accent."
        },
        {
          "sentence": "¡_____ a la escuela! (ir)",
          "correct": "Ve",
          "distractor": "Va",
          "explanation": "Irregular tú command of ir is 've'; preposition 'a' confirms it's ir, not ver."
        }
      ],
      "caveats": "Source captions garbled many forms (e.g., 'Trias' for 'traigas', 'kusas' for 'conduzcas', 'Salas' for 'salgas'); reconstructed from Spanish grammar."
    },
    {
      "chapter_id": "37",
      "slug": "nosotros-commands",
      "title": "Nosotros Commands",
      "time_range_sec": [
        10250,
        10646
      ],
      "summary": "Nosotros commands express 'Let's …'. Form by switching the present-tense vowel: -ar → -emos, -er/-ir → -amos. Same form is used for affirmative and negative; reflexive verbs drop the final -s before nos.",
      "suggested_grammar_note_id": "commands-imperative",
      "rules": [
        {
          "title": "Regular nosotros commands",
          "bullets": [
            "-ar: present 'amos' becomes 'emos' (hablamos → hablemos).",
            "-er/-ir: present 'emos/imos' becomes 'amos' (comemos → comamos, abrimos → abramos).",
            "Negative is the same form preceded by 'no'."
          ]
        },
        {
          "title": "Spelling and stem changes",
          "bullets": [
            "-car/-gar/-zar: practicar→practiquemos, jugar→juguemos, organizar→organicemos.",
            "Only -ir stem-changers change in nosotros, and only by ONE letter: dormir→durmamos, sentir→sintamos, pedir→pidamos."
          ]
        },
        {
          "title": "Common irregulars",
          "bullets": [
            "conduzcamos, digamos, hagamos, oigamos, tengamos, traigamos, vengamos, veamos, demos, seamos, estemos, sepamos."
          ]
        },
        {
          "title": "Object pronouns",
          "bullets": [
            "Affirmative: attach to verb with accent (abramos+lo → abrámoslo, comprémoslos, llevémoselo).",
            "Negative: pronouns separate before the verb (no lo abramos, no los compremos, no te lo llevemos)."
          ]
        },
        {
          "title": "Reflexive verbs and 'ir'",
          "bullets": [
            "Drop the final -s of the verb before attaching nos: sentémonos, bañémonos.",
            "Same -s drop happens before se (IOP): démoselo (not démosselo).",
            "ir: 'let's go' = vamos (informal) or vayamos (formal). 'Let's go out' = vámonos. Negative uses 'no nos vayamos'."
          ]
        }
      ],
      "examples": [
        {
          "es": "Hablemos español.",
          "en": "Let's speak Spanish.",
          "tags": [
            "regular"
          ]
        },
        {
          "es": "No comamos ahora.",
          "en": "Let's not eat now.",
          "tags": [
            "negative"
          ]
        },
        {
          "es": "Practiquemos juntos.",
          "en": "Let's practice together.",
          "tags": [
            "spell-change"
          ]
        },
        {
          "es": "Durmamos un poco.",
          "en": "Let's sleep a bit.",
          "tags": [
            "stem-change"
          ]
        },
        {
          "es": "Abrámoslo.",
          "en": "Let's open it.",
          "tags": [
            "pronouns"
          ]
        },
        {
          "es": "No lo abramos.",
          "en": "Let's not open it.",
          "tags": [
            "pronouns",
            "negative"
          ]
        },
        {
          "es": "Comprémoslos.",
          "en": "Let's buy them.",
          "tags": [
            "pronouns"
          ]
        },
        {
          "es": "Llevémoselo.",
          "en": "Let's bring it to him/her.",
          "tags": [
            "pronouns",
            "double"
          ]
        },
        {
          "es": "Sentémonos.",
          "en": "Let's sit down.",
          "tags": [
            "reflexive",
            "s-drop"
          ]
        },
        {
          "es": "No nos sentemos.",
          "en": "Let's not sit down.",
          "tags": [
            "reflexive",
            "negative"
          ]
        },
        {
          "es": "Vámonos.",
          "en": "Let's go (out)!",
          "tags": [
            "ir",
            "irse"
          ]
        },
        {
          "es": "No nos vayamos.",
          "en": "Let's not leave.",
          "tags": [
            "ir",
            "negative"
          ]
        },
        {
          "es": "Démoselo a él.",
          "en": "Let's give it to him.",
          "tags": [
            "s-drop",
            "pronouns"
          ]
        }
      ],
      "vocab": [
        {
          "es": "sentarse",
          "en": "to sit down",
          "pos": "verb"
        },
        {
          "es": "bañarse",
          "en": "to bathe",
          "pos": "verb"
        },
        {
          "es": "irse",
          "en": "to leave/go out",
          "pos": "verb"
        },
        {
          "es": "vámonos",
          "en": "let's go!",
          "pos": "phrase"
        },
        {
          "es": "vayamos",
          "en": "let's go (formal)",
          "pos": "phrase"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "imp_afirmativo",
          "forms": {
            "yo": "—",
            "tu": "habla",
            "el": "hable",
            "nosotros": "hablemos",
            "vosotros": "hablad",
            "ellos": "hablen"
          }
        },
        {
          "verb": "comer",
          "tense_id": "imp_afirmativo",
          "forms": {
            "yo": "—",
            "tu": "come",
            "el": "coma",
            "nosotros": "comamos",
            "vosotros": "comed",
            "ellos": "coman"
          }
        },
        {
          "verb": "ir",
          "tense_id": "imp_afirmativo",
          "forms": {
            "yo": "—",
            "tu": "ve",
            "el": "vaya",
            "nosotros": "vamos",
            "vosotros": "id",
            "ellos": "vayan"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Let's speak: ¡_____ español! (hablar)",
          "correct": "Hablemos",
          "distractor": "Hablamos",
          "explanation": "-ar nosotros command swaps -amos to -emos."
        },
        {
          "sentence": "Let's eat: ¡_____! (comer)",
          "correct": "Comamos",
          "distractor": "Comemos",
          "explanation": "-er swaps -emos to -amos."
        },
        {
          "sentence": "Let's practice: ¡_____! (practicar)",
          "correct": "Practiquemos",
          "distractor": "Practicemos",
          "explanation": "-car needs c→qu before e."
        },
        {
          "sentence": "Let's sleep: ¡_____! (dormir)",
          "correct": "Durmamos",
          "distractor": "Dormamos",
          "explanation": "-ir stem-changer: o→u in nosotros."
        },
        {
          "sentence": "Let's sit down: ¡_____! (sentarse)",
          "correct": "Sentémonos",
          "distractor": "Sentémosnos",
          "explanation": "Drop the final -s before attaching nos."
        },
        {
          "sentence": "Let's not sit down: ¡_____! (sentarse)",
          "correct": "No nos sentemos",
          "distractor": "No nos sentémonos",
          "explanation": "Negative: pronoun before verb, no s-drop."
        },
        {
          "sentence": "Let's go out: ¡_____! (irse)",
          "correct": "Vámonos",
          "distractor": "Vayámonos",
          "explanation": "Affirmative uses present 'vamos' minus s + nos."
        },
        {
          "sentence": "Let's not leave: ¡_____! (irse)",
          "correct": "No nos vayamos",
          "distractor": "No nos vamos",
          "explanation": "Negative requires the irregular 'vayamos'."
        }
      ],
      "caveats": "Captions repeatedly garbled forms ('SOS', 'BOS', 'deos') reconstructed via grammar rules."
    },
    {
      "chapter_id": "38",
      "slug": "past-participles-as-adjectives",
      "title": "Past Participles As Adjectives",
      "time_range_sec": [
        10646,
        10912
      ],
      "summary": "Past participles can be used as adjectives that agree in gender and number with the noun, typically paired with estar to describe a current state.",
      "suggested_grammar_note_id": "ser-vs-estar",
      "rules": [
        {
          "title": "Forming past participles",
          "bullets": [
            "-ar verbs: drop -ar, add -ado (hablar→hablado).",
            "-er/-ir verbs: drop ending, add -ido (comer→comido, vivir→vivido).",
            "-er/-ir with two vowels need an accent: caído, creído, leído, oído, reído, sonreído, traído."
          ]
        },
        {
          "title": "Common irregular participles",
          "bullets": [
            "abierto, dicho, descrito, descubierto, escrito, hecho, muerto, puesto, resuelto, roto, visto, vuelto, cubierto."
          ]
        },
        {
          "title": "Adjective agreement and placement",
          "bullets": [
            "As adjectives, participles agree in gender and number: cerrado/a/os/as.",
            "Place after the noun: la puerta cerrada.",
            "Use estar for the resulting state: La puerta está cerrada."
          ]
        }
      ],
      "examples": [
        {
          "es": "La puerta está cerrada.",
          "en": "The door is closed.",
          "tags": [
            "estar",
            "fem"
          ]
        },
        {
          "es": "La puerta cerrada.",
          "en": "The closed door.",
          "tags": [
            "adjective"
          ]
        },
        {
          "es": "El libro está abierto.",
          "en": "The book is open.",
          "tags": [
            "estar",
            "irregular"
          ]
        },
        {
          "es": "El libro abierto.",
          "en": "The open book.",
          "tags": [
            "adjective",
            "irregular"
          ]
        },
        {
          "es": "Los textos están escritos.",
          "en": "The texts are written.",
          "tags": [
            "plural"
          ]
        },
        {
          "es": "Los textos escritos.",
          "en": "The written texts.",
          "tags": [
            "adjective",
            "plural"
          ]
        },
        {
          "es": "La cama está hecha.",
          "en": "The bed is made.",
          "tags": [
            "irregular",
            "fem"
          ]
        },
        {
          "es": "El problema está resuelto.",
          "en": "The problem is resolved.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "Mis respuestas están completas.",
          "en": "My answers are completed.",
          "tags": [
            "plural",
            "fem"
          ]
        },
        {
          "es": "El día está muerto.",
          "en": "The day is dead.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "El Día de los Muertos.",
          "en": "The Day of the Dead.",
          "tags": [
            "plural",
            "noun-use"
          ]
        },
        {
          "es": "Yo estoy terminado.",
          "en": "I am finished.",
          "tags": [
            "state"
          ]
        }
      ],
      "vocab": [
        {
          "es": "abierto",
          "en": "open/opened",
          "pos": "adj"
        },
        {
          "es": "cerrado",
          "en": "closed",
          "pos": "adj"
        },
        {
          "es": "escrito",
          "en": "written",
          "pos": "adj"
        },
        {
          "es": "hecho",
          "en": "done/made",
          "pos": "adj"
        },
        {
          "es": "roto",
          "en": "broken",
          "pos": "adj"
        },
        {
          "es": "muerto",
          "en": "dead",
          "pos": "adj"
        },
        {
          "es": "resuelto",
          "en": "resolved",
          "pos": "adj"
        },
        {
          "es": "vuelto",
          "en": "returned",
          "pos": "adj"
        },
        {
          "es": "puesto",
          "en": "put/placed",
          "pos": "adj"
        },
        {
          "es": "visto",
          "en": "seen",
          "pos": "adj"
        },
        {
          "es": "dicho",
          "en": "said/told",
          "pos": "adj"
        },
        {
          "es": "leído",
          "en": "read",
          "pos": "adj"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "La puerta está _____ (cerrar).",
          "correct": "cerrada",
          "distractor": "cerrado",
          "explanation": "Puerta is feminine; participle agrees."
        },
        {
          "sentence": "El libro está _____ (abrir).",
          "correct": "abierto",
          "distractor": "abrido",
          "explanation": "Abrir has irregular participle 'abierto'."
        },
        {
          "sentence": "Los textos están _____ (escribir).",
          "correct": "escritos",
          "distractor": "escribidos",
          "explanation": "Irregular 'escrito', plural masculine."
        },
        {
          "sentence": "La cama está _____ (hacer).",
          "correct": "hecha",
          "distractor": "hacida",
          "explanation": "Hacer→hecho; agrees with feminine cama."
        },
        {
          "sentence": "El problema está _____ (resolver).",
          "correct": "resuelto",
          "distractor": "resolvido",
          "explanation": "Resolver has irregular 'resuelto'."
        },
        {
          "sentence": "Mis respuestas están _____ (completar).",
          "correct": "completas",
          "distractor": "completados",
          "explanation": "Respuestas is feminine plural."
        },
        {
          "sentence": "El día está _____ (morir).",
          "correct": "muerto",
          "distractor": "morido",
          "explanation": "Morir has irregular 'muerto'."
        },
        {
          "sentence": "El _____ Día de los _____.",
          "correct": "Muertos",
          "distractor": "Muerto",
          "explanation": "Plural masculine: Muertos."
        }
      ],
      "caveats": "OCR omitted accents on leído/oído/caído; restored. Some examples ('al respuestas') reconstructed."
    },
    {
      "chapter_id": "39",
      "slug": "present-perfect-tense",
      "title": "Present Perfect Tense",
      "time_range_sec": [
        10912,
        11170
      ],
      "summary": "The present perfect (pretérito perfecto) expresses what someone has done. It uses present-tense haber + past participle and the two pieces are inseparable.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Formula",
          "bullets": [
            "Conjugated present 'haber' (he, has, ha, hemos, habéis, han) + past participle.",
            "Past participle does NOT change for gender/number when in the perfect tense.",
            "Only as a standalone adjective does the participle agree."
          ]
        },
        {
          "title": "Inseparability",
          "bullets": [
            "haber + participle can NEVER be split.",
            "Negation (no), DOPs, and IOPs all go BEFORE haber.",
            "Reflexive pronouns also precede haber."
          ]
        },
        {
          "title": "haber vs tener",
          "bullets": [
            "haber = auxiliary 'to have done'.",
            "tener = main verb 'to possess'.",
            "I have a dog → Yo tengo un perro. I have eaten → Yo he comido. I have had many friends → Yo he tenido muchos amigos."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo he hablado.",
          "en": "I have spoken.",
          "tags": [
            "regular"
          ]
        },
        {
          "es": "Tú has comido.",
          "en": "You have eaten.",
          "tags": [
            "regular"
          ]
        },
        {
          "es": "Él ha leído.",
          "en": "He has read.",
          "tags": [
            "accent"
          ]
        },
        {
          "es": "¿Has leído el libro?",
          "en": "Have you read the book?",
          "tags": [
            "question"
          ]
        },
        {
          "es": "Sí, yo lo he leído.",
          "en": "Yes, I have read it.",
          "tags": [
            "DOP"
          ]
        },
        {
          "es": "No, yo no lo he leído.",
          "en": "No, I have not read it.",
          "tags": [
            "negative",
            "DOP"
          ]
        },
        {
          "es": "John me lo ha dicho.",
          "en": "John has told it to me.",
          "tags": [
            "IOP",
            "DOP"
          ]
        },
        {
          "es": "John no me lo ha dicho.",
          "en": "John has not told it to me.",
          "tags": [
            "negative"
          ]
        },
        {
          "es": "Yo he tenido muchos amigos.",
          "en": "I have had a lot of friends.",
          "tags": [
            "haber-vs-tener"
          ]
        },
        {
          "es": "Nosotros hemos vivido aquí.",
          "en": "We have lived here.",
          "tags": [
            "regular"
          ]
        },
        {
          "es": "Ella ha escrito una carta.",
          "en": "She has written a letter.",
          "tags": [
            "irregular-participle"
          ]
        },
        {
          "es": "¿Has visto la película?",
          "en": "Have you seen the movie?",
          "tags": [
            "irregular-participle"
          ]
        }
      ],
      "vocab": [
        {
          "es": "haber",
          "en": "to have (auxiliary)",
          "pos": "verb"
        },
        {
          "es": "tener",
          "en": "to have (possess)",
          "pos": "verb"
        },
        {
          "es": "ya",
          "en": "already",
          "pos": "adv"
        },
        {
          "es": "nunca",
          "en": "never",
          "pos": "adv"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "haber",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "he",
            "tu": "has",
            "el": "ha",
            "nosotros": "hemos",
            "vosotros": "habéis",
            "ellos": "han"
          }
        },
        {
          "verb": "hablar",
          "tense_id": "ind_perfecto",
          "forms": {
            "yo": "he hablado",
            "tu": "has hablado",
            "el": "ha hablado",
            "nosotros": "hemos hablado",
            "vosotros": "habéis hablado",
            "ellos": "han hablado"
          }
        },
        {
          "verb": "comer",
          "tense_id": "ind_perfecto",
          "forms": {
            "yo": "he comido",
            "tu": "has comido",
            "el": "ha comido",
            "nosotros": "hemos comido",
            "vosotros": "habéis comido",
            "ellos": "han comido"
          }
        },
        {
          "verb": "escribir",
          "tense_id": "ind_perfecto",
          "forms": {
            "yo": "he escrito",
            "tu": "has escrito",
            "el": "ha escrito",
            "nosotros": "hemos escrito",
            "vosotros": "habéis escrito",
            "ellos": "han escrito"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ hablado con él. (haber)",
          "correct": "he",
          "distractor": "ha",
          "explanation": "yo + haber = he."
        },
        {
          "sentence": "Tú _____ comido demasiado. (haber)",
          "correct": "has",
          "distractor": "ha",
          "explanation": "tú + haber = has."
        },
        {
          "sentence": "Nosotros _____ vivido aquí cinco años.",
          "correct": "hemos",
          "distractor": "habemos",
          "explanation": "nosotros + haber = hemos."
        },
        {
          "sentence": "Ella ha _____ una carta. (escribir)",
          "correct": "escrito",
          "distractor": "escribido",
          "explanation": "Escribir is irregular: escrito."
        },
        {
          "sentence": "¿_____ visto la película? (tú, haber)",
          "correct": "Has",
          "distractor": "Hes",
          "explanation": "tú form is 'has'."
        },
        {
          "sentence": "John no me _____ ha dicho.",
          "correct": "lo",
          "distractor": "le",
          "explanation": "DOP 'lo' goes before haber along with IOP me."
        },
        {
          "sentence": "Yo _____ tenido muchos amigos.",
          "correct": "he",
          "distractor": "tengo",
          "explanation": "Use haber + tenido for 'have had'."
        },
        {
          "sentence": "I have to read = Yo _____ que leer.",
          "correct": "tengo",
          "distractor": "he",
          "explanation": "Obligation uses tener que, not haber."
        }
      ],
      "caveats": "Captions repeatedly elided syllables (Yol, abl). Reconstructed full forms with proper accents (leído, escrito)."
    },
    {
      "chapter_id": "40",
      "slug": "past-perfect-tense",
      "title": "Past Perfect Tense",
      "time_range_sec": [
        11170,
        11381
      ],
      "summary": "The past perfect (pluscuamperfecto) expresses what someone HAD done before another past action. It uses imperfect haber (había, etc.) + past participle.",
      "suggested_grammar_note_id": "preterite-vs-imperfect",
      "rules": [
        {
          "title": "Formula",
          "bullets": [
            "Imperfect haber (había, habías, había, habíamos, habíais, habían) + past participle.",
            "Same inseparability rule as the present perfect."
          ]
        },
        {
          "title": "Common pairings",
          "bullets": [
            "ya (already) goes BEFORE haber: Ella ya había salido.",
            "antes de + noun/infinitive = 'before': Antes de llegar, yo ya había comido.",
            "Reflexive pronouns and DOPs/IOPs precede haber."
          ]
        },
        {
          "title": "Three 'had's in English vs Spanish",
          "bullets": [
            "I had to study (obligation, completed) → Yo tuve que estudiar (preterite of tener).",
            "I had a dog (ongoing past state) → Yo tenía un perro (imperfect of tener).",
            "I had eaten (action before another past) → Yo había comido (past perfect)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Ella ya había salido.",
          "en": "She had already left.",
          "tags": [
            "ya"
          ]
        },
        {
          "es": "Yo ya había estudiado.",
          "en": "I had already studied.",
          "tags": [
            "ya"
          ]
        },
        {
          "es": "Antes de llegar a la escuela, yo ya había comido.",
          "en": "Before arriving at school, I had already eaten.",
          "tags": [
            "antes-de"
          ]
        },
        {
          "es": "Antes de este mes, yo había trabajado mucho.",
          "en": "Before this month, I had worked a lot.",
          "tags": [
            "antes-de"
          ]
        },
        {
          "es": "Él me lo había mostrado.",
          "en": "He had shown it to me.",
          "tags": [
            "pronouns"
          ]
        },
        {
          "es": "Él nunca me lo había mostrado.",
          "en": "He had never shown it to me.",
          "tags": [
            "negative"
          ]
        },
        {
          "es": "Él no me lo había mostrado.",
          "en": "He had not shown it to me.",
          "tags": [
            "negative"
          ]
        },
        {
          "es": "Antes de ir al trabajo, me había duchado.",
          "en": "Before going to work, I had taken a shower.",
          "tags": [
            "reflexive"
          ]
        },
        {
          "es": "Yo había comido antes de la fiesta.",
          "en": "I had eaten before the party.",
          "tags": [
            "antes-de"
          ]
        },
        {
          "es": "Nosotros habíamos visto la película.",
          "en": "We had seen the movie.",
          "tags": [
            "irregular-participle"
          ]
        }
      ],
      "vocab": [
        {
          "es": "ya",
          "en": "already",
          "pos": "adv"
        },
        {
          "es": "antes de",
          "en": "before",
          "pos": "phrase"
        },
        {
          "es": "nunca",
          "en": "never",
          "pos": "adv"
        },
        {
          "es": "ducharse",
          "en": "to shower",
          "pos": "verb"
        },
        {
          "es": "mostrar",
          "en": "to show",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "haber",
          "tense_id": "ind_imperfecto",
          "forms": {
            "yo": "había",
            "tu": "habías",
            "el": "había",
            "nosotros": "habíamos",
            "vosotros": "habíais",
            "ellos": "habían"
          }
        },
        {
          "verb": "comer",
          "tense_id": "ind_pluscuamperfecto",
          "forms": {
            "yo": "había comido",
            "tu": "habías comido",
            "el": "había comido",
            "nosotros": "habíamos comido",
            "vosotros": "habíais comido",
            "ellos": "habían comido"
          }
        },
        {
          "verb": "ver",
          "tense_id": "ind_pluscuamperfecto",
          "forms": {
            "yo": "había visto",
            "tu": "habías visto",
            "el": "había visto",
            "nosotros": "habíamos visto",
            "vosotros": "habíais visto",
            "ellos": "habían visto"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Ella ya _____ salido. (haber)",
          "correct": "había",
          "distractor": "ha",
          "explanation": "Past perfect uses imperfect haber 'había'."
        },
        {
          "sentence": "Yo ya _____ estudiado.",
          "correct": "había",
          "distractor": "habría",
          "explanation": "Yo form is 'había' in imperfect."
        },
        {
          "sentence": "Nosotros _____ visto la película.",
          "correct": "habíamos",
          "distractor": "hemos",
          "explanation": "Nosotros form 'habíamos' for past perfect."
        },
        {
          "sentence": "Antes de llegar, yo ya _____ comido.",
          "correct": "había",
          "distractor": "he",
          "explanation": "Past perfect with antes de."
        },
        {
          "sentence": "Él no me lo _____ mostrado.",
          "correct": "había",
          "distractor": "habrá",
          "explanation": "Negation goes before haber, which stays imperfect."
        },
        {
          "sentence": "I had a dog (state) → Yo _____ un perro.",
          "correct": "tenía",
          "distractor": "había tenido",
          "explanation": "Ongoing past state uses imperfect of tener."
        },
        {
          "sentence": "I had to study → Yo _____ que estudiar.",
          "correct": "tuve",
          "distractor": "había",
          "explanation": "Completed obligation uses preterite of tener."
        },
        {
          "sentence": "Antes de ir al trabajo, me _____ duchado.",
          "correct": "había",
          "distractor": "habíamos",
          "explanation": "Reflexive 'me' before haber, yo form 'había'."
        }
      ],
      "caveats": "Captions truncated 'había' to 'ABIA'/'AB'. Restored full conjugations with accents on the í."
    },
    {
      "chapter_id": "41",
      "slug": "future-tense",
      "title": "Future Tense",
      "time_range_sec": [
        11381,
        11647
      ],
      "summary": "The simple future expresses what will happen. Spanish keeps the full infinitive and adds endings -é, -ás, -á, -emos, -éis, -án, the same set for all three verb classes.",
      "suggested_grammar_note_id": "future-vs-ir-a",
      "rules": [
        {
          "title": "Regular formation",
          "bullets": [
            "Take the infinitive (do not drop the ending) and add: -é, -ás, -á, -emos, -éis, -án.",
            "All endings have an accent EXCEPT nosotros (-emos).",
            "Same endings for -ar, -er, and -ir verbs."
          ]
        },
        {
          "title": "Irregular stems (same endings)",
          "bullets": [
            "decir → dir-, hacer → har-, poder → podr-, poner → pondr-, querer → querr-, saber → sabr-, salir → saldr-, tener → tendr-, venir → vendr-, haber → habr-."
          ]
        },
        {
          "title": "Pronouns and alternative",
          "bullets": [
            "Object pronouns and 'no' precede the conjugated future verb (Yo te lo daré).",
            "Near-future alternative: 'ir a + infinitive' (Voy a comer) is more common in conversation.",
            "Use tener for ages: Él tendrá 30 años."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo haré mi tarea.",
          "en": "I will do my homework.",
          "tags": [
            "irregular-stem"
          ]
        },
        {
          "es": "Tú comprarás una casa en el futuro.",
          "en": "You will buy a house in the future.",
          "tags": [
            "regular"
          ]
        },
        {
          "es": "Él tendrá 30 años.",
          "en": "He will be 30 years old.",
          "tags": [
            "tener",
            "age"
          ]
        },
        {
          "es": "Nosotros aprenderemos español mañana.",
          "en": "We will learn Spanish tomorrow.",
          "tags": [
            "regular",
            "nosotros"
          ]
        },
        {
          "es": "Ellos vendrán si quieren.",
          "en": "They will come if they want.",
          "tags": [
            "irregular-stem"
          ]
        },
        {
          "es": "Yo te lo daré.",
          "en": "I will give it to you.",
          "tags": [
            "pronouns"
          ]
        },
        {
          "es": "Él se bañará.",
          "en": "He will take a bath.",
          "tags": [
            "reflexive"
          ]
        },
        {
          "es": "¿Qué harás mañana?",
          "en": "What will you do tomorrow?",
          "tags": [
            "question",
            "irregular"
          ]
        },
        {
          "es": "Nosotros saldremos pronto.",
          "en": "We will leave soon.",
          "tags": [
            "irregular-stem"
          ]
        },
        {
          "es": "Yo iré a la escuela.",
          "en": "I will go to the school.",
          "tags": [
            "ir"
          ]
        },
        {
          "es": "Yo voy a ir a la escuela.",
          "en": "I am going to go to the school.",
          "tags": [
            "ir-a",
            "alternative"
          ]
        },
        {
          "es": "Ella caminará.",
          "en": "She will walk.",
          "tags": [
            "regular"
          ]
        }
      ],
      "vocab": [
        {
          "es": "mañana",
          "en": "tomorrow / morning",
          "pos": "adv"
        },
        {
          "es": "futuro",
          "en": "future",
          "pos": "noun"
        },
        {
          "es": "tarea",
          "en": "task / homework",
          "pos": "noun"
        },
        {
          "es": "comprar",
          "en": "to buy",
          "pos": "verb"
        },
        {
          "es": "aprender",
          "en": "to learn",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "hablaré",
            "tu": "hablarás",
            "el": "hablará",
            "nosotros": "hablaremos",
            "vosotros": "hablaréis",
            "ellos": "hablarán"
          }
        },
        {
          "verb": "comer",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "comeré",
            "tu": "comerás",
            "el": "comerá",
            "nosotros": "comeremos",
            "vosotros": "comeréis",
            "ellos": "comerán"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "viviré",
            "tu": "vivirás",
            "el": "vivirá",
            "nosotros": "viviremos",
            "vosotros": "viviréis",
            "ellos": "vivirán"
          }
        },
        {
          "verb": "tener",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "tendré",
            "tu": "tendrás",
            "el": "tendrá",
            "nosotros": "tendremos",
            "vosotros": "tendréis",
            "ellos": "tendrán"
          }
        },
        {
          "verb": "hacer",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "haré",
            "tu": "harás",
            "el": "hará",
            "nosotros": "haremos",
            "vosotros": "haréis",
            "ellos": "harán"
          }
        },
        {
          "verb": "decir",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "diré",
            "tu": "dirás",
            "el": "dirá",
            "nosotros": "diremos",
            "vosotros": "diréis",
            "ellos": "dirán"
          }
        },
        {
          "verb": "poder",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "podré",
            "tu": "podrás",
            "el": "podrá",
            "nosotros": "podremos",
            "vosotros": "podréis",
            "ellos": "podrán"
          }
        },
        {
          "verb": "salir",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "saldré",
            "tu": "saldrás",
            "el": "saldrá",
            "nosotros": "saldremos",
            "vosotros": "saldréis",
            "ellos": "saldrán"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Mañana yo _____ al cine. (ir)",
          "correct": "iré",
          "distractor": "iba",
          "explanation": "Future of ir (yo): iré."
        },
        {
          "sentence": "Tú _____ una casa. (comprar)",
          "correct": "comprarás",
          "distractor": "compraras",
          "explanation": "Tú future ending is -ás (with accent)."
        },
        {
          "sentence": "Él _____ 30 años. (tener)",
          "correct": "tendrá",
          "distractor": "tenerá",
          "explanation": "Tener uses irregular stem 'tendr-'."
        },
        {
          "sentence": "Nosotros _____ español. (aprender)",
          "correct": "aprenderemos",
          "distractor": "aprenderémos",
          "explanation": "Nosotros future has NO accent."
        },
        {
          "sentence": "Ellos _____ si quieren. (venir)",
          "correct": "vendrán",
          "distractor": "venirán",
          "explanation": "Venir uses irregular stem 'vendr-'."
        },
        {
          "sentence": "Yo _____ mi tarea. (hacer)",
          "correct": "haré",
          "distractor": "haceré",
          "explanation": "Hacer uses irregular stem 'har-'."
        },
        {
          "sentence": "Yo te lo _____ mañana. (dar)",
          "correct": "daré",
          "distractor": "doy",
          "explanation": "Future yo of dar is daré."
        },
        {
          "sentence": "Equivalent: 'I'm going to go' = Yo _____ a ir.",
          "correct": "voy",
          "distractor": "iré",
          "explanation": "ir a + infinitive uses present 'voy'."
        }
      ],
      "caveats": "OCR scrambled stems ('Trias', 'sa to know'). Reconstructed full irregular stem set per standard Spanish."
    },
    {
      "chapter_id": "42",
      "slug": "future-perfect-tense",
      "title": "Future Perfect Tense",
      "time_range_sec": [
        11647,
        11805
      ],
      "summary": "The future perfect (futuro perfecto) expresses what will have happened by some point in the future. It uses future haber (habré, habrás, habrá...) + past participle.",
      "suggested_grammar_note_id": null,
      "rules": [
        {
          "title": "Formula",
          "bullets": [
            "Future of haber: habré, habrás, habrá, habremos, habréis, habrán + past participle.",
            "Endings mirror the simple future (-é, -ás, -á, -emos, -éis, -án); only habremos lacks an accent.",
            "haber + participle is inseparable (negatives and pronouns precede haber)."
          ]
        },
        {
          "title": "Time expressions",
          "bullets": [
            "para + time = 'by' (Para el lunes).",
            "dentro de + time = 'within' (Dentro de un año).",
            "These constructions are the most natural triggers for the future perfect."
          ]
        },
        {
          "title": "Usage notes",
          "bullets": [
            "Used for actions guaranteed to be completed by a future point.",
            "Rare in everyday speech; the simple future or 'ir a' is preferred.",
            "Can also express probability about the recent past: 'Habrá llegado ya' (He has probably arrived)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Para el lunes, yo habré terminado mis tareas.",
          "en": "By Monday, I will have finished my tasks.",
          "tags": [
            "para"
          ]
        },
        {
          "es": "Dentro de un año, tú habrás dejado tu trabajo.",
          "en": "Within a year, you will have left your job.",
          "tags": [
            "dentro-de"
          ]
        },
        {
          "es": "Para esa fecha, John habrá recibido muchas ofertas.",
          "en": "By that date, John will have received many offers.",
          "tags": [
            "para"
          ]
        },
        {
          "es": "Para mañana, nosotros habremos llegado.",
          "en": "By tomorrow, we will have arrived.",
          "tags": [
            "nosotros",
            "para"
          ]
        },
        {
          "es": "Dentro de dos horas, ellos habrán comido.",
          "en": "Within two hours, they will have eaten.",
          "tags": [
            "dentro-de"
          ]
        },
        {
          "es": "Para el verano, yo habré aprendido español.",
          "en": "By summer, I will have learned Spanish.",
          "tags": [
            "para"
          ]
        },
        {
          "es": "Para diciembre, ella habrá vuelto.",
          "en": "By December, she will have returned.",
          "tags": [
            "irregular-participle"
          ]
        },
        {
          "es": "Para esa hora, habremos visto la película.",
          "en": "By that time, we will have seen the movie.",
          "tags": [
            "irregular-participle"
          ]
        }
      ],
      "vocab": [
        {
          "es": "para",
          "en": "by (deadline)",
          "pos": "phrase"
        },
        {
          "es": "dentro de",
          "en": "within",
          "pos": "phrase"
        },
        {
          "es": "fecha",
          "en": "date",
          "pos": "noun"
        },
        {
          "es": "oferta",
          "en": "offer",
          "pos": "noun"
        },
        {
          "es": "dejar",
          "en": "to leave / quit",
          "pos": "verb"
        },
        {
          "es": "recibir",
          "en": "to receive",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "haber",
          "tense_id": "ind_futuro",
          "forms": {
            "yo": "habré",
            "tu": "habrás",
            "el": "habrá",
            "nosotros": "habremos",
            "vosotros": "habréis",
            "ellos": "habrán"
          }
        },
        {
          "verb": "terminar",
          "tense_id": "ind_futuro_perfecto",
          "forms": {
            "yo": "habré terminado",
            "tu": "habrás terminado",
            "el": "habrá terminado",
            "nosotros": "habremos terminado",
            "vosotros": "habréis terminado",
            "ellos": "habrán terminado"
          }
        },
        {
          "verb": "ver",
          "tense_id": "ind_futuro_perfecto",
          "forms": {
            "yo": "habré visto",
            "tu": "habrás visto",
            "el": "habrá visto",
            "nosotros": "habremos visto",
            "vosotros": "habréis visto",
            "ellos": "habrán visto"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Para el lunes, yo _____ terminado. (haber)",
          "correct": "habré",
          "distractor": "habría",
          "explanation": "Future of haber, yo = habré."
        },
        {
          "sentence": "Dentro de un año, tú _____ dejado tu trabajo.",
          "correct": "habrás",
          "distractor": "habrías",
          "explanation": "Tú future of haber = habrás."
        },
        {
          "sentence": "Para esa fecha, John _____ recibido muchas ofertas.",
          "correct": "habrá",
          "distractor": "habría",
          "explanation": "Él future of haber = habrá."
        },
        {
          "sentence": "Nosotros _____ llegado para mañana.",
          "correct": "habremos",
          "distractor": "habríamos",
          "explanation": "Nosotros future of haber = habremos (no accent)."
        },
        {
          "sentence": "Ellos _____ comido dentro de dos horas.",
          "correct": "habrán",
          "distractor": "han",
          "explanation": "Future perfect needs habrán, not present."
        },
        {
          "sentence": "Para diciembre, ella habrá _____ . (volver)",
          "correct": "vuelto",
          "distractor": "volvido",
          "explanation": "Volver has irregular participle 'vuelto'."
        },
        {
          "sentence": "By summer, I will have learned = Para el verano, yo _____ aprendido.",
          "correct": "habré",
          "distractor": "he",
          "explanation": "Future perfect uses habré, not he (present perfect)."
        }
      ],
      "caveats": "Captions abbreviated 'habré' to 'AB' and dropped accents. Verified all forms; 'habremos' is the only un-accented form."
    },
    {
      "chapter_id": "43",
      "slug": "conditional-tense",
      "title": "Conditional Tense",
      "time_range_sec": [
        11805,
        12051
      ],
      "summary": "The conditional tense expresses what one would do or what would happen. Formed by adding -ía endings to the infinitive; same irregular stems as the future tense.",
      "suggested_grammar_note_id": "conditional-if-clauses",
      "rules": [
        {
          "title": "Formation",
          "bullets": [
            "Add endings directly to the infinitive (no stem change for regulars).",
            "Endings are the same for -ar, -er, and -ir verbs: -ía, -ías, -ía, -íamos, -íais, -ían.",
            "All forms carry an accent on the í."
          ]
        },
        {
          "title": "Irregular stems",
          "bullets": [
            "Same irregular stems as the future tense.",
            "decir → dir-, hacer → har-, poder → podr-, poner → pondr-, querer → querr-, saber → sabr-, salir → saldr-, tener → tendr-, venir → vendr-."
          ]
        },
        {
          "title": "Usage",
          "bullets": [
            "Polite requests with poder: ¿Podrías…? = Could you…?",
            "Pairs with si + past subjunctive in hypothetical clauses.",
            "Object pronouns go before the conjugated verb or attach to an infinitive."
          ]
        }
      ],
      "examples": [
        {
          "es": "¿Irías conmigo?",
          "en": "Would you go with me?",
          "tags": [
            "question",
            "ir"
          ]
        },
        {
          "es": "Sí, yo iría contigo.",
          "en": "Yes, I would go with you.",
          "tags": [
            "ir"
          ]
        },
        {
          "es": "¿Compraría él ese auto?",
          "en": "Would he buy that car?",
          "tags": [
            "question"
          ]
        },
        {
          "es": "¿Vivirían ellos en esta región?",
          "en": "Would they live in this region?",
          "tags": [
            "question"
          ]
        },
        {
          "es": "Querríamos un plato, por favor.",
          "en": "We would want a plate, please.",
          "tags": [
            "polite",
            "irregular"
          ]
        },
        {
          "es": "Tú dirías que esta lección es buena.",
          "en": "You would say that this lesson is good.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "Sin ti, yo no sé qué yo haría.",
          "en": "Without you, I don't know what I would do.",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "¿Podrías abrir la ventana?",
          "en": "Could you open the window?",
          "tags": [
            "polite",
            "poder"
          ]
        },
        {
          "es": "No, yo no podría abrirla.",
          "en": "No, I could not open it.",
          "tags": [
            "DOP",
            "infinitive"
          ]
        },
        {
          "es": "¿Me lo podrías dar?",
          "en": "Could you give it to me?",
          "tags": [
            "DOP",
            "IOP"
          ]
        },
        {
          "es": "Me bañaría.",
          "en": "I would take a bath.",
          "tags": [
            "reflexive"
          ]
        }
      ],
      "vocab": [
        {
          "es": "podría",
          "en": "could (polite)",
          "pos": "verb"
        },
        {
          "es": "tendría",
          "en": "would have",
          "pos": "verb"
        },
        {
          "es": "querría",
          "en": "would want",
          "pos": "verb"
        },
        {
          "es": "haría",
          "en": "would do/make",
          "pos": "verb"
        },
        {
          "es": "diría",
          "en": "would say",
          "pos": "verb"
        },
        {
          "es": "saldría",
          "en": "would leave",
          "pos": "verb"
        },
        {
          "es": "vendría",
          "en": "would come",
          "pos": "verb"
        },
        {
          "es": "pondría",
          "en": "would put",
          "pos": "verb"
        },
        {
          "es": "sabría",
          "en": "would know",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "cond_presente",
          "forms": {
            "yo": "hablaría",
            "tu": "hablarías",
            "el": "hablaría",
            "nosotros": "hablaríamos",
            "vosotros": "hablaríais",
            "ellos": "hablarían"
          }
        },
        {
          "verb": "comer",
          "tense_id": "cond_presente",
          "forms": {
            "yo": "comería",
            "tu": "comerías",
            "el": "comería",
            "nosotros": "comeríamos",
            "vosotros": "comeríais",
            "ellos": "comerían"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "cond_presente",
          "forms": {
            "yo": "viviría",
            "tu": "vivirías",
            "el": "viviría",
            "nosotros": "viviríamos",
            "vosotros": "viviríais",
            "ellos": "vivirían"
          }
        },
        {
          "verb": "tener",
          "tense_id": "cond_presente",
          "forms": {
            "yo": "tendría",
            "tu": "tendrías",
            "el": "tendría",
            "nosotros": "tendríamos",
            "vosotros": "tendríais",
            "ellos": "tendrían"
          }
        },
        {
          "verb": "poder",
          "tense_id": "cond_presente",
          "forms": {
            "yo": "podría",
            "tu": "podrías",
            "el": "podría",
            "nosotros": "podríamos",
            "vosotros": "podríais",
            "ellos": "podrían"
          }
        },
        {
          "verb": "decir",
          "tense_id": "cond_presente",
          "forms": {
            "yo": "diría",
            "tu": "dirías",
            "el": "diría",
            "nosotros": "diríamos",
            "vosotros": "diríais",
            "ellos": "dirían"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "¿_____ tú abrir la ventana, por favor?",
          "correct": "Podrías",
          "distractor": "Puedes",
          "explanation": "Conditional of poder for a polite request."
        },
        {
          "sentence": "Yo _____ contigo si tuviera tiempo.",
          "correct": "iría",
          "distractor": "iba",
          "explanation": "Hypothetical → conditional of ir."
        },
        {
          "sentence": "Nosotros _____ un plato, por favor.",
          "correct": "querríamos",
          "distractor": "queremos",
          "explanation": "Polite request uses conditional of querer (note double rr)."
        },
        {
          "sentence": "Sin ti, yo no sé qué yo _____.",
          "correct": "haría",
          "distractor": "hacía",
          "explanation": "Conditional of hacer (irregular stem har-)."
        },
        {
          "sentence": "Ella _____ la verdad.",
          "correct": "diría",
          "distractor": "decía",
          "explanation": "Conditional of decir uses irregular stem dir-."
        },
        {
          "sentence": "¿_____ ellos en esta región?",
          "correct": "Vivirían",
          "distractor": "Vivían",
          "explanation": "Conditional, not imperfect — would they live."
        },
        {
          "sentence": "Yo _____ ese coche si fuera barato.",
          "correct": "compraría",
          "distractor": "compré",
          "explanation": "Hypothetical 'would buy' is conditional."
        },
        {
          "sentence": "Tú _____ más amigos en una ciudad nueva.",
          "correct": "tendrías",
          "distractor": "tienes",
          "explanation": "Conditional of tener uses stem tendr-."
        }
      ],
      "caveats": "OCR garbled accents and verb forms (e.g., 'la lamos' for 'íamos', 'P' for 'poder'). Reconstructed using standard conditional paradigm."
    },
    {
      "chapter_id": "44",
      "slug": "conditional-perfect-tense",
      "title": "Conditional Perfect Tense",
      "time_range_sec": [
        12051,
        12168
      ],
      "summary": "The conditional perfect expresses what would have happened. Formed with the conditional of haber (habría, habrías, habría, habríamos, habríais, habrían) plus a past participle.",
      "suggested_grammar_note_id": "conditional-if-clauses",
      "rules": [
        {
          "title": "Formation",
          "bullets": [
            "Conditional of haber + past participle.",
            "haber forms: habría, habrías, habría, habríamos, habríais, habrían.",
            "Past participle is invariable in compound tenses (always ends in -o)."
          ]
        },
        {
          "title": "Usage",
          "bullets": [
            "Describes an action that would have happened but did not.",
            "Pairs with the pluperfect subjunctive in contrary-to-fact si clauses: 'Si hubiera estudiado, habría aprobado.'",
            "Rare in casual speech; common in writing and formal contexts."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo habría terminado mi trabajo.",
          "en": "I would have finished my work.",
          "tags": [
            "regular-participle"
          ]
        },
        {
          "es": "Tú habrías disfrutado estar ahí.",
          "en": "You would have enjoyed being there.",
          "tags": [
            "regular-participle"
          ]
        },
        {
          "es": "Ella habría abierto las ventanas.",
          "en": "She would have opened the windows.",
          "tags": [
            "irregular-participle"
          ]
        },
        {
          "es": "Nosotros habríamos comido más.",
          "en": "We would have eaten more.",
          "tags": [
            "regular-participle"
          ]
        },
        {
          "es": "Ellos habrían venido a la fiesta.",
          "en": "They would have come to the party.",
          "tags": [
            "regular-participle"
          ]
        },
        {
          "es": "Yo habría dicho la verdad.",
          "en": "I would have told the truth.",
          "tags": [
            "irregular-participle"
          ]
        },
        {
          "es": "¿Habrías hecho lo mismo?",
          "en": "Would you have done the same?",
          "tags": [
            "irregular-participle",
            "question"
          ]
        }
      ],
      "vocab": [
        {
          "es": "habría",
          "en": "would have (1s/3s)",
          "pos": "verb"
        },
        {
          "es": "abierto",
          "en": "opened (irreg. participle)",
          "pos": "adj"
        },
        {
          "es": "dicho",
          "en": "said (irreg. participle)",
          "pos": "adj"
        },
        {
          "es": "hecho",
          "en": "done/made (irreg. participle)",
          "pos": "adj"
        },
        {
          "es": "puesto",
          "en": "put (irreg. participle)",
          "pos": "adj"
        },
        {
          "es": "visto",
          "en": "seen (irreg. participle)",
          "pos": "adj"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "haber",
          "tense_id": "cond_presente",
          "forms": {
            "yo": "habría",
            "tu": "habrías",
            "el": "habría",
            "nosotros": "habríamos",
            "vosotros": "habríais",
            "ellos": "habrían"
          }
        },
        {
          "verb": "terminar",
          "tense_id": "cond_perfecto",
          "forms": {
            "yo": "habría terminado",
            "tu": "habrías terminado",
            "el": "habría terminado",
            "nosotros": "habríamos terminado",
            "vosotros": "habríais terminado",
            "ellos": "habrían terminado"
          }
        },
        {
          "verb": "abrir",
          "tense_id": "cond_perfecto",
          "forms": {
            "yo": "habría abierto",
            "tu": "habrías abierto",
            "el": "habría abierto",
            "nosotros": "habríamos abierto",
            "vosotros": "habríais abierto",
            "ellos": "habrían abierto"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo _____ terminado mi trabajo.",
          "correct": "habría",
          "distractor": "había",
          "explanation": "Conditional perfect uses habría (would have), not había (had)."
        },
        {
          "sentence": "Ella habría _____ las ventanas.",
          "correct": "abierto",
          "distractor": "abrido",
          "explanation": "abrir has the irregular participle abierto."
        },
        {
          "sentence": "Tú _____ disfrutado estar ahí.",
          "correct": "habrías",
          "distractor": "habrás",
          "explanation": "Second-person conditional of haber."
        },
        {
          "sentence": "Nosotros _____ venido si nos hubieran invitado.",
          "correct": "habríamos",
          "distractor": "habremos",
          "explanation": "Hypothetical past needs conditional perfect, not future perfect."
        },
        {
          "sentence": "Yo habría _____ la verdad.",
          "correct": "dicho",
          "distractor": "decido",
          "explanation": "decir → dicho (irregular participle)."
        },
        {
          "sentence": "Ellos _____ hecho lo mismo.",
          "correct": "habrían",
          "distractor": "han",
          "explanation": "Conditional perfect: habrían + participle."
        }
      ],
      "caveats": "OCR mangled 'habría' → 'abria/ABA'. Form is standard; reconstructed from canonical paradigm."
    },
    {
      "chapter_id": "45",
      "slug": "que-lo-que",
      "title": "Que & Lo que",
      "time_range_sec": [
        12168,
        12452
      ],
      "summary": "que (no accent) is the conjunction 'that' linking clauses; lo que means 'what / that which' as a relative pronoun for an abstract idea, often appearing at the start or middle of a sentence.",
      "suggested_grammar_note_id": "relative-pronouns",
      "rules": [
        {
          "title": "que (conjunction)",
          "bullets": [
            "Means 'that' — joins a main clause to a subordinate clause.",
            "English may drop 'that' (the book I bought), but Spanish always keeps que.",
            "qué WITH accent = the question word 'what?'"
          ]
        },
        {
          "title": "lo que (relative pronoun)",
          "bullets": [
            "Means 'what' or 'that which' — never as a question.",
            "Refers to an abstract idea, not a specific noun.",
            "Can appear at the beginning or middle of a sentence and is movable without changing meaning."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo usaré el teléfono que yo compré.",
          "en": "I will use the phone (that) I bought.",
          "tags": [
            "que-conjunction"
          ]
        },
        {
          "es": "Él quiere el libro que está en el estante.",
          "en": "He wants the book that is on the shelf.",
          "tags": [
            "que-conjunction"
          ]
        },
        {
          "es": "La casa que tú ves es grande.",
          "en": "The house (that) you see is big.",
          "tags": [
            "que-conjunction"
          ]
        },
        {
          "es": "Nosotros fuimos a un restaurante que es caro.",
          "en": "We went to a restaurant that is expensive.",
          "tags": [
            "que-conjunction"
          ]
        },
        {
          "es": "Ellos harán el trabajo que ellos tienen.",
          "en": "They will do the work (that) they have.",
          "tags": [
            "que-conjunction"
          ]
        },
        {
          "es": "Yo he tomado la medicina que el doctor me dio.",
          "en": "I have taken the medicine the doctor gave me.",
          "tags": [
            "que-conjunction",
            "perfect"
          ]
        },
        {
          "es": "Yo veo que ese hombre está caminando.",
          "en": "I see that that man is walking.",
          "tags": [
            "que-conjunction",
            "ese"
          ]
        },
        {
          "es": "Lo que yo quiero es una casa.",
          "en": "What I want is a house.",
          "tags": [
            "lo-que"
          ]
        },
        {
          "es": "Una casa es lo que yo quiero.",
          "en": "A house is what I want.",
          "tags": [
            "lo-que"
          ]
        },
        {
          "es": "Tú no sabes lo que tú quieres.",
          "en": "You don't know what you want.",
          "tags": [
            "lo-que"
          ]
        },
        {
          "es": "Él tiene que hacer lo que él necesita hacer.",
          "en": "He has to do what he needs to do.",
          "tags": [
            "lo-que"
          ]
        },
        {
          "es": "Lo que ellos necesitan es algo para comer.",
          "en": "What they need is something to eat.",
          "tags": [
            "lo-que"
          ]
        },
        {
          "es": "Yo no vi lo que tú me diste.",
          "en": "I did not see what you gave me.",
          "tags": [
            "lo-que"
          ]
        },
        {
          "es": "Para visualmente mostrar lo que yo quiero decir.",
          "en": "To visually show what I want to say.",
          "tags": [
            "lo-que"
          ]
        }
      ],
      "vocab": [
        {
          "es": "que",
          "en": "that (conjunction)",
          "pos": "phrase"
        },
        {
          "es": "qué",
          "en": "what? (question word)",
          "pos": "phrase"
        },
        {
          "es": "lo que",
          "en": "what / that which",
          "pos": "phrase"
        },
        {
          "es": "estante",
          "en": "shelf",
          "pos": "noun"
        },
        {
          "es": "medicina",
          "en": "medicine",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Yo usaré el teléfono _____ yo compré.",
          "correct": "que",
          "distractor": "lo que",
          "explanation": "Refers to a specific noun (teléfono), so use que."
        },
        {
          "sentence": "_____ yo quiero es una casa.",
          "correct": "Lo que",
          "distractor": "Que",
          "explanation": "Refers to an abstract idea ('what I want'), so use lo que."
        },
        {
          "sentence": "Tú no sabes _____ tú quieres.",
          "correct": "lo que",
          "distractor": "que",
          "explanation": "'What you want' is unspecified — lo que."
        },
        {
          "sentence": "La casa _____ tú ves es grande.",
          "correct": "que",
          "distractor": "lo que",
          "explanation": "Modifying a specific noun (casa)."
        },
        {
          "sentence": "Yo veo _____ ese hombre está caminando.",
          "correct": "que",
          "distractor": "lo que",
          "explanation": "Conjunction joining clauses ('I see that…')."
        },
        {
          "sentence": "_____ ellos necesitan es algo para comer.",
          "correct": "Lo que",
          "distractor": "Que",
          "explanation": "Abstract subject of the sentence."
        },
        {
          "sentence": "Yo no vi _____ tú me diste.",
          "correct": "lo que",
          "distractor": "que",
          "explanation": "Unspecified thing — lo que."
        },
        {
          "sentence": "Yo he tomado la medicina _____ el doctor me dio.",
          "correct": "que",
          "distractor": "lo que",
          "explanation": "Modifies medicina, a specific noun."
        }
      ],
      "caveats": "OCR rendered 'que' as 'K' and 'lo que' as 'Lo'. Restored standard spellings; accents on qué for question word."
    },
    {
      "chapter_id": "46",
      "slug": "understanding-the-subjunctive",
      "title": "Understanding the Subjunctive",
      "time_range_sec": [
        12452,
        12921
      ],
      "summary": "The subjunctive is a mood that expresses uncertainty, desire, emotion, or hypotheticals. It's triggered by a WEIRD verb (Will, Emotion, Influence, Recommendation, Doubt) plus que and a different subject.",
      "suggested_grammar_note_id": "subjunctive-triggers",
      "rules": [
        {
          "title": "Spotting a subjunctive sentence",
          "bullets": [
            "Construction: S/V + que + S/V (different subjects).",
            "Or: impersonal main clause + que + S/V (e.g., 'Es necesario que…').",
            "The first verb determines whether the subjunctive is activated."
          ]
        },
        {
          "title": "WEIRD trigger categories",
          "bullets": [
            "Will: querer, preferir, necesitar, desear.",
            "Emotion: esperar, gustar, tener miedo, alegrarse de.",
            "Influence: insistir en, desear, mandar.",
            "Recommendation/Request: recomendar, sugerir, aconsejar, pedir.",
            "Doubt/Disbelief/Denial: dudar, negar, no creer, no pensar."
          ]
        },
        {
          "title": "Verbs/expressions that DO NOT trigger the subjunctive",
          "bullets": [
            "creer que, saber que, pensar que (in affirmative) — express opinions/facts.",
            "Es un hecho que, Es verdad que, Es obvio que — statements of fact use the indicative."
          ]
        },
        {
          "title": "Four tenses of the subjunctive",
          "bullets": [
            "Present subjunctive — present/future actions.",
            "Imperfect (past) subjunctive — past actions, contrary-to-fact si clauses.",
            "Present perfect subjunctive — recently completed actions.",
            "Pluperfect subjunctive — past hypotheticals (would have…)."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo creo que tú comiste.",
          "en": "I believe that you ate.",
          "tags": [
            "NOT-subjunctive",
            "creer"
          ]
        },
        {
          "es": "Yo sé que tú comiste.",
          "en": "I know that you ate.",
          "tags": [
            "NOT-subjunctive",
            "saber"
          ]
        },
        {
          "es": "Es un hecho que tú comiste.",
          "en": "It's a fact that you ate.",
          "tags": [
            "NOT-subjunctive",
            "fact"
          ]
        },
        {
          "es": "Yo quiero que tú estudies.",
          "en": "I want you to study.",
          "tags": [
            "subjunctive",
            "querer"
          ]
        },
        {
          "es": "Es necesario que estemos aquí.",
          "en": "It's necessary that we be here.",
          "tags": [
            "subjunctive",
            "impersonal"
          ]
        },
        {
          "es": "Espero que tengas un buen día.",
          "en": "I hope you have a good day.",
          "tags": [
            "subjunctive",
            "esperar"
          ]
        },
        {
          "es": "Dudo que él venga.",
          "en": "I doubt he'll come.",
          "tags": [
            "subjunctive",
            "dudar"
          ]
        }
      ],
      "vocab": [
        {
          "es": "querer",
          "en": "to want (Will)",
          "pos": "verb"
        },
        {
          "es": "esperar",
          "en": "to hope (Emotion)",
          "pos": "verb"
        },
        {
          "es": "necesitar",
          "en": "to need (Will)",
          "pos": "verb"
        },
        {
          "es": "desear",
          "en": "to wish/desire (Influence)",
          "pos": "verb"
        },
        {
          "es": "recomendar",
          "en": "to recommend (Recommendation)",
          "pos": "verb"
        },
        {
          "es": "sugerir",
          "en": "to suggest (Recommendation)",
          "pos": "verb"
        },
        {
          "es": "dudar",
          "en": "to doubt (Doubt)",
          "pos": "verb"
        },
        {
          "es": "negar",
          "en": "to deny (Denial)",
          "pos": "verb"
        },
        {
          "es": "Es necesario que",
          "en": "It's necessary that",
          "pos": "phrase"
        },
        {
          "es": "Es importante que",
          "en": "It's important that",
          "pos": "phrase"
        },
        {
          "es": "Ojalá",
          "en": "Hopefully / I hope",
          "pos": "phrase"
        }
      ],
      "conjugation_tables": [],
      "exercises": [
        {
          "sentence": "Yo quiero que tú _____ español. (estudiar)",
          "correct": "estudies",
          "distractor": "estudias",
          "explanation": "querer triggers subjunctive; second clause has a new subject."
        },
        {
          "sentence": "Es necesario que nosotros _____ aquí. (estar)",
          "correct": "estemos",
          "distractor": "estamos",
          "explanation": "Impersonal expression triggers subjunctive."
        },
        {
          "sentence": "Yo sé que tú _____ la verdad. (decir)",
          "correct": "dices",
          "distractor": "digas",
          "explanation": "saber states a fact — indicative, not subjunctive."
        },
        {
          "sentence": "Dudo que él _____ a la fiesta. (venir)",
          "correct": "venga",
          "distractor": "viene",
          "explanation": "dudar (Doubt) triggers subjunctive."
        },
        {
          "sentence": "Es un hecho que la Tierra _____ redonda. (ser)",
          "correct": "es",
          "distractor": "sea",
          "explanation": "Statement of fact uses indicative."
        },
        {
          "sentence": "Espero que tú _____ bien. (estar)",
          "correct": "estés",
          "distractor": "estás",
          "explanation": "esperar (Emotion) triggers subjunctive."
        },
        {
          "sentence": "Recomiendo que ustedes _____ todos los días. (practicar)",
          "correct": "practiquen",
          "distractor": "practican",
          "explanation": "recomendar triggers subjunctive; -car → -quen spelling change."
        }
      ],
      "caveats": "OCR rendered WEIRD as 'weird', 'K' for 'que'. Concept is conventional WEIRDO/WEIRD subjunctive trigger framework."
    },
    {
      "chapter_id": "47",
      "slug": "verbs-in-the-present-subjunctive",
      "title": "Verbs in the Present Subjunctive",
      "time_range_sec": [
        12921,
        13473
      ],
      "summary": "Form the present subjunctive by taking the yo form of the present indicative, dropping -o, and adding the opposite vowel endings: -ar verbs use -e endings; -er/-ir verbs use -a endings. Five verbs are fully irregular.",
      "suggested_grammar_note_id": "subjunctive-triggers",
      "rules": [
        {
          "title": "Regular verbs — opposite vowel rule",
          "bullets": [
            "-ar verbs take -e endings: -e, -es, -e, -emos, -éis, -en.",
            "-er and -ir verbs take -a endings: -a, -as, -a, -amos, -áis, -an.",
            "Drop the -o from the yo form of present indicative, then add the opposite endings."
          ]
        },
        {
          "title": "Irregular yo verbs",
          "bullets": [
            "Take the irregular yo stem and apply it to all persons.",
            "tener (tengo) → tenga, tengas, tenga, tengamos, tengáis, tengan.",
            "Other examples: hacer→haga, decir→diga, oír→oiga, traer→traiga, venir→venga, ver→vea, conducir→conduzca."
          ]
        },
        {
          "title": "-car / -gar / -zar spelling changes",
          "bullets": [
            "-car → -que (marcar → marque) to keep hard k sound.",
            "-gar → -gue (pagar → pague) to keep hard g sound.",
            "-zar → -ce (organizar → organice) — z never before e/i in standard spelling."
          ]
        },
        {
          "title": "Stem-changing verbs",
          "bullets": [
            "Same stem changes as the present indicative.",
            "-ar and -er stem-changers: nosotros and vosotros do NOT change.",
            "-ir stem-changers DO change in nosotros/vosotros: pedir → pidamos, sentir → sintamos, dormir → durmamos."
          ]
        },
        {
          "title": "Five fully irregular verbs",
          "bullets": [
            "ser → sea, seas, sea, seamos, seáis, sean.",
            "estar → esté, estés, esté, estemos, estéis, estén (note accents).",
            "ir → vaya, vayas, vaya, vayamos, vayáis, vayan.",
            "saber → sepa, sepas, sepa, sepamos, sepáis, sepan.",
            "dar → dé, des, dé, demos, deis, den (dé carries accent vs preposition de).",
            "Also: haber → haya, hayas, haya, hayamos, hayáis, hayan (used for present perfect subjunctive)."
          ]
        }
      ],
      "examples": [
        {
          "es": "que yo hable",
          "en": "(that) I speak",
          "tags": [
            "regular-ar"
          ]
        },
        {
          "es": "que tú comas",
          "en": "(that) you eat",
          "tags": [
            "regular-er"
          ]
        },
        {
          "es": "que él viva",
          "en": "(that) he live",
          "tags": [
            "regular-ir"
          ]
        },
        {
          "es": "que nosotros tengamos",
          "en": "(that) we have",
          "tags": [
            "irregular-yo"
          ]
        },
        {
          "es": "que ellos digan",
          "en": "(that) they say",
          "tags": [
            "irregular-yo"
          ]
        },
        {
          "es": "que yo pague",
          "en": "(that) I pay",
          "tags": [
            "spelling-change"
          ]
        },
        {
          "es": "que tú duermas",
          "en": "(that) you sleep",
          "tags": [
            "stem-change"
          ]
        },
        {
          "es": "que nosotros durmamos",
          "en": "(that) we sleep",
          "tags": [
            "stem-change-nosotros"
          ]
        },
        {
          "es": "que él sea",
          "en": "(that) he be",
          "tags": [
            "irregular"
          ]
        },
        {
          "es": "que nosotros vayamos",
          "en": "(that) we go",
          "tags": [
            "irregular"
          ]
        }
      ],
      "vocab": [
        {
          "es": "marcar",
          "en": "to mark",
          "pos": "verb"
        },
        {
          "es": "pagar",
          "en": "to pay",
          "pos": "verb"
        },
        {
          "es": "organizar",
          "en": "to organize",
          "pos": "verb"
        },
        {
          "es": "conducir",
          "en": "to drive",
          "pos": "verb"
        },
        {
          "es": "pedir",
          "en": "to ask for",
          "pos": "verb"
        },
        {
          "es": "sentir",
          "en": "to feel",
          "pos": "verb"
        },
        {
          "es": "dormir",
          "en": "to sleep",
          "pos": "verb"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "hable",
            "tu": "hables",
            "el": "hable",
            "nosotros": "hablemos",
            "vosotros": "habléis",
            "ellos": "hablen"
          }
        },
        {
          "verb": "comer",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "coma",
            "tu": "comas",
            "el": "coma",
            "nosotros": "comamos",
            "vosotros": "comáis",
            "ellos": "coman"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "viva",
            "tu": "vivas",
            "el": "viva",
            "nosotros": "vivamos",
            "vosotros": "viváis",
            "ellos": "vivan"
          }
        },
        {
          "verb": "tener",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "tenga",
            "tu": "tengas",
            "el": "tenga",
            "nosotros": "tengamos",
            "vosotros": "tengáis",
            "ellos": "tengan"
          }
        },
        {
          "verb": "decir",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "diga",
            "tu": "digas",
            "el": "diga",
            "nosotros": "digamos",
            "vosotros": "digáis",
            "ellos": "digan"
          }
        },
        {
          "verb": "conducir",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "conduzca",
            "tu": "conduzcas",
            "el": "conduzca",
            "nosotros": "conduzcamos",
            "vosotros": "conduzcáis",
            "ellos": "conduzcan"
          }
        },
        {
          "verb": "pagar",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "pague",
            "tu": "pagues",
            "el": "pague",
            "nosotros": "paguemos",
            "vosotros": "paguéis",
            "ellos": "paguen"
          }
        },
        {
          "verb": "marcar",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "marque",
            "tu": "marques",
            "el": "marque",
            "nosotros": "marquemos",
            "vosotros": "marquéis",
            "ellos": "marquen"
          }
        },
        {
          "verb": "organizar",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "organice",
            "tu": "organices",
            "el": "organice",
            "nosotros": "organicemos",
            "vosotros": "organicéis",
            "ellos": "organicen"
          }
        },
        {
          "verb": "dormir",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "duerma",
            "tu": "duermas",
            "el": "duerma",
            "nosotros": "durmamos",
            "vosotros": "durmáis",
            "ellos": "duerman"
          }
        },
        {
          "verb": "ser",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "sea",
            "tu": "seas",
            "el": "sea",
            "nosotros": "seamos",
            "vosotros": "seáis",
            "ellos": "sean"
          }
        },
        {
          "verb": "estar",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "esté",
            "tu": "estés",
            "el": "esté",
            "nosotros": "estemos",
            "vosotros": "estéis",
            "ellos": "estén"
          }
        },
        {
          "verb": "ir",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "vaya",
            "tu": "vayas",
            "el": "vaya",
            "nosotros": "vayamos",
            "vosotros": "vayáis",
            "ellos": "vayan"
          }
        },
        {
          "verb": "saber",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "sepa",
            "tu": "sepas",
            "el": "sepa",
            "nosotros": "sepamos",
            "vosotros": "sepáis",
            "ellos": "sepan"
          }
        },
        {
          "verb": "dar",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "dé",
            "tu": "des",
            "el": "dé",
            "nosotros": "demos",
            "vosotros": "deis",
            "ellos": "den"
          }
        },
        {
          "verb": "haber",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "haya",
            "tu": "hayas",
            "el": "haya",
            "nosotros": "hayamos",
            "vosotros": "hayáis",
            "ellos": "hayan"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Quiero que tú _____ ahora. (hablar)",
          "correct": "hables",
          "distractor": "hablas",
          "explanation": "-ar verbs take -e endings in present subjunctive."
        },
        {
          "sentence": "Espero que él _____ algo nuevo. (aprender)",
          "correct": "aprenda",
          "distractor": "aprende",
          "explanation": "-er verbs take -a endings."
        },
        {
          "sentence": "Es importante que nosotros _____ a tiempo. (llegar)",
          "correct": "lleguemos",
          "distractor": "llegamos",
          "explanation": "-gar → -gue spelling change to keep hard g sound."
        },
        {
          "sentence": "Dudo que ella _____ la verdad. (saber)",
          "correct": "sepa",
          "distractor": "sabe",
          "explanation": "saber is one of the 5 fully irregular verbs."
        },
        {
          "sentence": "Quiero que tú _____ feliz. (ser)",
          "correct": "seas",
          "distractor": "eres",
          "explanation": "ser → sea, seas, sea…"
        },
        {
          "sentence": "Es necesario que él _____ al doctor. (ir)",
          "correct": "vaya",
          "distractor": "va",
          "explanation": "ir → vaya in present subjunctive."
        },
        {
          "sentence": "Quiero que nosotros _____ temprano. (dormir)",
          "correct": "durmamos",
          "distractor": "dormamos",
          "explanation": "-ir stem-changer: dormir changes o→u in nosotros."
        },
        {
          "sentence": "Recomiendo que tú _____ este texto. (analizar)",
          "correct": "analices",
          "distractor": "analizas",
          "explanation": "-zar → -ce spelling change."
        },
        {
          "sentence": "Es bueno que yo _____ paciencia. (tener)",
          "correct": "tenga",
          "distractor": "tengo",
          "explanation": "Irregular yo verb: tengo → tenga across all persons."
        }
      ],
      "caveats": "OCR mangled many subjunctive forms (e.g., 'EST' for esté, 'cond' for conduzca). Reconstructed from standard paradigm. Note dé and esté/estés/etc. carry accents."
    },
    {
      "chapter_id": "48",
      "slug": "examples-in-the-present-subjunctive",
      "title": "Examples in the Present Subjunctive",
      "time_range_sec": [
        13473,
        13867
      ],
      "summary": "Practice sentences using one verb from each WEIRD category — querer, esperar, desear, recomendar, dudar — plus impersonal expressions, all triggering the present subjunctive in the second clause.",
      "suggested_grammar_note_id": "subjunctive-triggers",
      "rules": [
        {
          "title": "Sentence pattern",
          "bullets": [
            "[WEIRD verb in indicative] + que + [new subject] + [verb in present subjunctive].",
            "Same-subject sentences drop que and use the infinitive: 'Quiero estudiar' (not 'que yo estudie').",
            "English often translates with an infinitive: 'Yo quiero que tú estudies' = 'I want you to study.'"
          ]
        },
        {
          "title": "Object pronouns",
          "bullets": [
            "Object pronouns can attach to the infinitive (hacerlo) or precede the conjugated subjunctive verb (que tú lo hagas).",
            "Indirect object pronouns commonly appear with recommendation verbs: 'Te recomendamos que…'"
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo quiero que tú estudies español.",
          "en": "I want you to study Spanish.",
          "tags": [
            "querer",
            "Will"
          ]
        },
        {
          "es": "Yo quiero que él lo use.",
          "en": "I want him to use it.",
          "tags": [
            "querer",
            "DOP"
          ]
        },
        {
          "es": "Yo quiero que ellos ganen el juego.",
          "en": "I want them to win the game.",
          "tags": [
            "querer"
          ]
        },
        {
          "es": "Tú esperas que yo compre el libro.",
          "en": "You hope I buy the book.",
          "tags": [
            "esperar",
            "Emotion"
          ]
        },
        {
          "es": "Tú esperas que él coma su comida.",
          "en": "You hope he eats his food.",
          "tags": [
            "esperar"
          ]
        },
        {
          "es": "Tú esperas que ellos lean algunos libros.",
          "en": "You hope they read some books.",
          "tags": [
            "esperar"
          ]
        },
        {
          "es": "Ella desea que tú lo compartas con ella.",
          "en": "She wishes you would share it with her.",
          "tags": [
            "desear",
            "Influence"
          ]
        },
        {
          "es": "Ella desea que escribamos más.",
          "en": "She wishes we would write more.",
          "tags": [
            "desear"
          ]
        },
        {
          "es": "Te recomendamos que tú conduzcas este coche.",
          "en": "We recommend you drive this car.",
          "tags": [
            "recomendar",
            "Recommendation",
            "irregular-yo"
          ]
        },
        {
          "es": "A él le recomendamos que él conduzca con seguridad.",
          "en": "We recommend he drive safely.",
          "tags": [
            "recomendar"
          ]
        },
        {
          "es": "Ellos dudan que él diga mucho.",
          "en": "They doubt he says much.",
          "tags": [
            "dudar",
            "Doubt"
          ]
        },
        {
          "es": "Ellos dudan que tú les digas eso.",
          "en": "They doubt you tell them that.",
          "tags": [
            "dudar",
            "IOP"
          ]
        },
        {
          "es": "Yo quiero que tú lo hagas.",
          "en": "I want you to do it.",
          "tags": [
            "querer",
            "irregular-yo"
          ]
        },
        {
          "es": "Tú esperas que tengamos lo que tú necesitas.",
          "en": "You hope we have what you need.",
          "tags": [
            "esperar",
            "lo-que"
          ]
        },
        {
          "es": "Ella desea que tú vengas ahora mismo.",
          "en": "She wishes you would come right now.",
          "tags": [
            "desear"
          ]
        },
        {
          "es": "Yo quiero que él juegue con sus amigos.",
          "en": "I want him to play with his friends.",
          "tags": [
            "querer",
            "spelling"
          ]
        },
        {
          "es": "Yo quiero que tú analices esta frase.",
          "en": "I want you to analyze this phrase.",
          "tags": [
            "querer",
            "spelling"
          ]
        },
        {
          "es": "Tú esperas que yo pueda hacerlo.",
          "en": "You hope I can do it.",
          "tags": [
            "esperar",
            "stem-change"
          ]
        },
        {
          "es": "Tú esperas que yo te entienda.",
          "en": "You hope I understand you.",
          "tags": [
            "esperar",
            "stem-change"
          ]
        },
        {
          "es": "Es necesario que estemos aquí.",
          "en": "It's necessary that we be here.",
          "tags": [
            "impersonal",
            "estar"
          ]
        },
        {
          "es": "Es importante que tú me lo des ahora.",
          "en": "It's important that you give it to me now.",
          "tags": [
            "impersonal",
            "dar"
          ]
        },
        {
          "es": "Es bueno que ella sea feliz.",
          "en": "It's good that she's happy.",
          "tags": [
            "impersonal",
            "ser"
          ]
        },
        {
          "es": "Es malo que yo sepa lo que es.",
          "en": "It's bad that I know what it is.",
          "tags": [
            "impersonal",
            "saber"
          ]
        },
        {
          "es": "Es triste que ellos vayan sin decir adiós.",
          "en": "It's sad that they leave without saying goodbye.",
          "tags": [
            "impersonal",
            "ir"
          ]
        }
      ],
      "vocab": [
        {
          "es": "compartir",
          "en": "to share",
          "pos": "verb"
        },
        {
          "es": "conducir",
          "en": "to drive",
          "pos": "verb"
        },
        {
          "es": "ahora mismo",
          "en": "right now",
          "pos": "phrase"
        },
        {
          "es": "los fines de semana",
          "en": "on the weekends",
          "pos": "phrase"
        },
        {
          "es": "todos los días",
          "en": "every day",
          "pos": "phrase"
        },
        {
          "es": "algo más",
          "en": "something else",
          "pos": "phrase"
        },
        {
          "es": "decir adiós",
          "en": "to say goodbye",
          "pos": "phrase"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "querer",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "quiero",
            "tu": "quieres",
            "el": "quiere",
            "nosotros": "queremos",
            "vosotros": "queréis",
            "ellos": "quieren"
          }
        },
        {
          "verb": "esperar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "espero",
            "tu": "esperas",
            "el": "espera",
            "nosotros": "esperamos",
            "vosotros": "esperáis",
            "ellos": "esperan"
          }
        },
        {
          "verb": "dudar",
          "tense_id": "ind_presente",
          "forms": {
            "yo": "dudo",
            "tu": "dudas",
            "el": "duda",
            "nosotros": "dudamos",
            "vosotros": "dudáis",
            "ellos": "dudan"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo quiero que tú _____ español. (estudiar)",
          "correct": "estudies",
          "distractor": "estudias",
          "explanation": "querer + que + new subject triggers present subjunctive."
        },
        {
          "sentence": "Tú esperas que yo _____ el libro. (comprar)",
          "correct": "compre",
          "distractor": "compro",
          "explanation": "esperar (Emotion) triggers subjunctive; -ar takes -e."
        },
        {
          "sentence": "Ella desea que nosotros _____ más. (escribir)",
          "correct": "escribamos",
          "distractor": "escribimos",
          "explanation": "-ir verb in subjunctive takes -a endings."
        },
        {
          "sentence": "Te recomendamos que tú _____ este coche. (conducir)",
          "correct": "conduzcas",
          "distractor": "conduces",
          "explanation": "Irregular yo: conduzco → conduzcas."
        },
        {
          "sentence": "Ellos dudan que él _____ mucho. (decir)",
          "correct": "diga",
          "distractor": "dice",
          "explanation": "Irregular yo: digo → diga."
        },
        {
          "sentence": "Es necesario que nosotros _____ aquí. (estar)",
          "correct": "estemos",
          "distractor": "estamos",
          "explanation": "Impersonal trigger; estar → estemos in nosotros."
        },
        {
          "sentence": "Es bueno que ella _____ feliz. (ser)",
          "correct": "sea",
          "distractor": "es",
          "explanation": "Impersonal expression triggers subjunctive; ser → sea."
        },
        {
          "sentence": "Es triste que ellos _____ sin decir adiós. (ir)",
          "correct": "vayan",
          "distractor": "van",
          "explanation": "ir is fully irregular: vayan."
        },
        {
          "sentence": "Yo quiero que él _____ con sus amigos. (jugar)",
          "correct": "juegue",
          "distractor": "juega",
          "explanation": "Stem change u→ue plus -gar spelling change to gu."
        },
        {
          "sentence": "Es importante que tú me lo _____ ahora. (dar)",
          "correct": "des",
          "distractor": "das",
          "explanation": "dar is fully irregular: dé, des, dé…"
        }
      ],
      "caveats": "OCR scrambled subjunctive forms throughout (e.g., 'juezuen' for 'jueguen', 'Estus' for 'estudies', 'adiés' for 'adiós'). Reconstructed using standard subjunctive forms; one OCR error 'juezuen' should be 'jueguen' for ellos plays."
    },
    {
      "chapter_id": "49",
      "slug": "past-subjunctive",
      "title": "Past Subjunctive (Imperfect Subjunctive)",
      "time_range_sec": [
        13867,
        14313
      ],
      "summary": "The past (imperfect) subjunctive expresses W.E.I.R.D.-triggered states and conditions when the main clause is in the preterite or imperfect. It has two interchangeable endings (-ra and -se), formed from the 3rd-person-plural preterite stem.",
      "suggested_grammar_note_id": "subjunctive-triggers",
      "rules": [
        {
          "title": "When to use",
          "bullets": [
            "Triggered by a W.E.I.R.D. verb (Wish, Emotion, Impersonal, Recommendation, Doubt) in the preterite or imperfect.",
            "Whole sentence must be in the past — both main and subordinate clauses are past tense.",
            "Also used in contrary-to-fact si-clauses (Si yo fuera rico…)."
          ]
        },
        {
          "title": "Formation",
          "bullets": [
            "Take the 3rd-person plural preterite, drop -ron, add -ra/-ras/-ra/-ramos/-rais/-ran (or -se/-ses/-se/-semos/-seis/-sen).",
            "The nosotros form always has an accent on the stem vowel: habláramos, comiéramos, fuéramos.",
            "-ra forms dominate spoken Spanish; -se forms are more literary/Iberian."
          ]
        },
        {
          "title": "Word order",
          "bullets": [
            "Negatives and object pronouns go before the conjugated verb: que él te lo diera, que no lo supiera."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo quería que tú hablaras conmigo.",
          "en": "I wanted you to speak with me.",
          "tags": [
            "regular-ar",
            "querer-trigger"
          ]
        },
        {
          "es": "Esperábamos que él hablara en la reunión.",
          "en": "We hoped that he spoke in the meeting.",
          "tags": [
            "esperar-trigger"
          ]
        },
        {
          "es": "Ella decidió que comiéramos algo.",
          "en": "She decided that we eat something.",
          "tags": [
            "regular-er"
          ]
        },
        {
          "es": "Tú insististe que yo corriera por las mañanas.",
          "en": "You insisted that I run in the mornings.",
          "tags": [
            "regular-er"
          ]
        },
        {
          "es": "Ellos me recomendaron que yo escribiera una carta.",
          "en": "They recommended that I write a letter.",
          "tags": [
            "recommendation"
          ]
        },
        {
          "es": "Yo necesitaba que tú recibieras este mensaje.",
          "en": "I needed you to receive this message.",
          "tags": [
            "regular-ir"
          ]
        },
        {
          "es": "Tú tenías miedo de que él te lo diera.",
          "en": "You were afraid that he gave you it.",
          "tags": [
            "irregular-dar",
            "object-pronouns"
          ]
        },
        {
          "es": "Él deseaba que dijéramos algo sobre eso.",
          "en": "He desired that we say something about that.",
          "tags": [
            "irregular-decir"
          ]
        },
        {
          "es": "Dudamos que tú estuvieras hablando.",
          "en": "We doubted that you were speaking.",
          "tags": [
            "irregular-estar",
            "progressive"
          ]
        },
        {
          "es": "Ellos querían que tú hicieras la cama.",
          "en": "They wanted you to make the bed.",
          "tags": [
            "irregular-hacer"
          ]
        },
        {
          "es": "Yo esperaba que tú fueras a la escuela.",
          "en": "I hoped that you went to school.",
          "tags": [
            "irregular-ir"
          ]
        },
        {
          "es": "Tú querías que yo fuera feliz.",
          "en": "You wanted me to be happy.",
          "tags": [
            "irregular-ser"
          ]
        },
        {
          "es": "Ella esperaba que yo pudiera encontrarlo.",
          "en": "She hoped that I could find it.",
          "tags": [
            "irregular-poder",
            "object-pronouns"
          ]
        },
        {
          "es": "Necesitábamos que tú lo pusieras aquí.",
          "en": "We needed you to put it here.",
          "tags": [
            "irregular-poner"
          ]
        },
        {
          "es": "Ellos dudaban que él supiera lo que era.",
          "en": "They doubted that he knew what it was.",
          "tags": [
            "irregular-saber"
          ]
        },
        {
          "es": "Era necesario que fuéramos a la escuela.",
          "en": "It was necessary that we go to school.",
          "tags": [
            "impersonal-trigger"
          ]
        }
      ],
      "vocab": [
        {
          "es": "querer",
          "en": "to want",
          "pos": "verb"
        },
        {
          "es": "esperar",
          "en": "to hope/wait",
          "pos": "verb"
        },
        {
          "es": "dudar",
          "en": "to doubt",
          "pos": "verb"
        },
        {
          "es": "necesitar",
          "en": "to need",
          "pos": "verb"
        },
        {
          "es": "recomendar",
          "en": "to recommend",
          "pos": "verb"
        },
        {
          "es": "tener miedo de",
          "en": "to be afraid of",
          "pos": "phrase"
        },
        {
          "es": "reunión",
          "en": "meeting",
          "pos": "noun"
        },
        {
          "es": "carta",
          "en": "letter",
          "pos": "noun"
        },
        {
          "es": "mensaje",
          "en": "message",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "hablar",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "hablara",
            "tu": "hablaras",
            "el": "hablara",
            "nosotros": "habláramos",
            "vosotros": "hablarais",
            "ellos": "hablaran"
          }
        },
        {
          "verb": "hablar",
          "tense_id": "subj_imperfecto_2",
          "forms": {
            "yo": "hablase",
            "tu": "hablases",
            "el": "hablase",
            "nosotros": "hablásemos",
            "vosotros": "hablaseis",
            "ellos": "hablasen"
          }
        },
        {
          "verb": "comer",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "comiera",
            "tu": "comieras",
            "el": "comiera",
            "nosotros": "comiéramos",
            "vosotros": "comierais",
            "ellos": "comieran"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "viviera",
            "tu": "vivieras",
            "el": "viviera",
            "nosotros": "viviéramos",
            "vosotros": "vivierais",
            "ellos": "vivieran"
          }
        },
        {
          "verb": "ser",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "fuera",
            "tu": "fueras",
            "el": "fuera",
            "nosotros": "fuéramos",
            "vosotros": "fuerais",
            "ellos": "fueran"
          }
        },
        {
          "verb": "ir",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "fuera",
            "tu": "fueras",
            "el": "fuera",
            "nosotros": "fuéramos",
            "vosotros": "fuerais",
            "ellos": "fueran"
          }
        },
        {
          "verb": "tener",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "tuviera",
            "tu": "tuvieras",
            "el": "tuviera",
            "nosotros": "tuviéramos",
            "vosotros": "tuvierais",
            "ellos": "tuvieran"
          }
        },
        {
          "verb": "hacer",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "hiciera",
            "tu": "hicieras",
            "el": "hiciera",
            "nosotros": "hiciéramos",
            "vosotros": "hicierais",
            "ellos": "hicieran"
          }
        },
        {
          "verb": "decir",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "dijera",
            "tu": "dijeras",
            "el": "dijera",
            "nosotros": "dijéramos",
            "vosotros": "dijerais",
            "ellos": "dijeran"
          }
        },
        {
          "verb": "poder",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "pudiera",
            "tu": "pudieras",
            "el": "pudiera",
            "nosotros": "pudiéramos",
            "vosotros": "pudierais",
            "ellos": "pudieran"
          }
        },
        {
          "verb": "saber",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "supiera",
            "tu": "supieras",
            "el": "supiera",
            "nosotros": "supiéramos",
            "vosotros": "supierais",
            "ellos": "supieran"
          }
        },
        {
          "verb": "estar",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "estuviera",
            "tu": "estuvieras",
            "el": "estuviera",
            "nosotros": "estuviéramos",
            "vosotros": "estuvierais",
            "ellos": "estuvieran"
          }
        },
        {
          "verb": "venir",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "viniera",
            "tu": "vinieras",
            "el": "viniera",
            "nosotros": "viniéramos",
            "vosotros": "vinierais",
            "ellos": "vinieran"
          }
        },
        {
          "verb": "dar",
          "tense_id": "subj_imperfecto_1",
          "forms": {
            "yo": "diera",
            "tu": "dieras",
            "el": "diera",
            "nosotros": "diéramos",
            "vosotros": "dierais",
            "ellos": "dieran"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo quería que tú _____ conmigo.",
          "correct": "hablaras",
          "distractor": "hablas",
          "explanation": "Querer in imperfect triggers past subjunctive in the subordinate clause."
        },
        {
          "sentence": "Si yo _____ rico, compraría una casa.",
          "correct": "fuera",
          "distractor": "soy",
          "explanation": "Contrary-to-fact si-clauses use the past subjunctive."
        },
        {
          "sentence": "Ella esperaba que yo _____ encontrarlo.",
          "correct": "pudiera",
          "distractor": "puedo",
          "explanation": "Esperar in past + W.E.I.R.D. trigger requires past subjunctive of poder."
        },
        {
          "sentence": "Ellos dudaban que él _____ lo que era.",
          "correct": "supiera",
          "distractor": "sabía",
          "explanation": "Dudar (Doubt) triggers subjunctive; past frame requires past subjunctive of saber."
        },
        {
          "sentence": "Era necesario que nosotros _____ a la escuela.",
          "correct": "fuéramos",
          "distractor": "íbamos",
          "explanation": "Impersonal expression in past + ir uses fuéramos (note accent on nosotros form)."
        },
        {
          "sentence": "Tú tenías miedo de que él te lo _____.",
          "correct": "diera",
          "distractor": "dio",
          "explanation": "Emotion in past triggers past subjunctive; dar → diera."
        },
        {
          "sentence": "Necesitábamos que tú lo _____ aquí.",
          "correct": "pusieras",
          "distractor": "pones",
          "explanation": "Past necesitar + W.E.I.R.D. trigger; poner → pusieras."
        },
        {
          "sentence": "Yo esperaba que ellos _____ un perro.",
          "correct": "tuvieran",
          "distractor": "tienen",
          "explanation": "Esperar in imperfect requires past subjunctive of tener."
        }
      ],
      "caveats": "OCR mangled accents and several Spanish phrases (e.g., 'noos'/'aan' for nosotros/han, 'predate' for preterite, missing tildes); restored from standard conjugation rules."
    },
    {
      "chapter_id": "50",
      "slug": "present-perfect-subjunctive",
      "title": "Present Perfect Subjunctive",
      "time_range_sec": [
        14313,
        14549
      ],
      "summary": "The present perfect subjunctive (haya/hayas/etc. + past participle) expresses what has happened in the subjunctive form, triggered by the same W.E.I.R.D. conditions as the present subjunctive. The whole sentence stays in the present.",
      "suggested_grammar_note_id": "subjunctive-triggers",
      "rules": [
        {
          "title": "Formation",
          "bullets": [
            "Present subjunctive of haber (haya, hayas, haya, hayamos, hayáis, hayan) + past participle.",
            "Past participle is invariable here — does not agree with subject."
          ]
        },
        {
          "title": "When to use",
          "bullets": [
            "Same W.E.I.R.D. triggers as the present subjunctive (Wish, Emotion, Impersonal, Recommendation, Doubt).",
            "Both clauses must be in the present — main clause in present indicative.",
            "Refers to a past/completed action evaluated from the present moment."
          ]
        },
        {
          "title": "Word order",
          "bullets": [
            "haber + past participle cannot be split.",
            "Negatives and object pronouns sit BEFORE the haya- form: 'que no me lo hayan dado'."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo espero que tú hayas dormido bien.",
          "en": "I hope that you have slept well.",
          "tags": [
            "esperar-trigger"
          ]
        },
        {
          "es": "Yo estoy feliz de que él haya dicho la verdad.",
          "en": "I am happy that he has told the truth.",
          "tags": [
            "emotion",
            "irregular-pp"
          ]
        },
        {
          "es": "No creemos que tú hayas comido mucho.",
          "en": "We don't believe that you have eaten a lot.",
          "tags": [
            "doubt"
          ]
        },
        {
          "es": "Es posible que hayamos hecho algo malo.",
          "en": "It's possible that we have done something bad.",
          "tags": [
            "impersonal",
            "irregular-pp"
          ]
        },
        {
          "es": "Es imposible que ellos hayan escrito un libro.",
          "en": "It's impossible that they have written a book.",
          "tags": [
            "impersonal",
            "irregular-pp"
          ]
        },
        {
          "es": "Yo espero que tú hayas resuelto el problema.",
          "en": "I hope that you have resolved the problem.",
          "tags": [
            "irregular-pp"
          ]
        },
        {
          "es": "Tú esperas que él haya estudiado para la prueba.",
          "en": "You hope that he has studied for the test.",
          "tags": [
            "esperar-trigger"
          ]
        },
        {
          "es": "Es triste que él no lo haya pasado.",
          "en": "It's sad that he has not passed it.",
          "tags": [
            "emotion",
            "object-pronoun"
          ]
        },
        {
          "es": "Ella duda que hayamos venido tan rápido.",
          "en": "She doubts that we have come so fast.",
          "tags": [
            "doubt"
          ]
        },
        {
          "es": "Ellos están preocupados de que tú los hayas visto.",
          "en": "They are worried that you have seen them.",
          "tags": [
            "emotion",
            "irregular-pp"
          ]
        },
        {
          "es": "Es una lástima que ellos no me lo hayan dado.",
          "en": "It's a shame that they have not given it to me.",
          "tags": [
            "impersonal",
            "double-pronouns"
          ]
        }
      ],
      "vocab": [
        {
          "es": "haber",
          "en": "to have (auxiliary)",
          "pos": "verb"
        },
        {
          "es": "verdad",
          "en": "truth",
          "pos": "noun"
        },
        {
          "es": "prueba",
          "en": "test",
          "pos": "noun"
        },
        {
          "es": "lástima",
          "en": "shame/pity",
          "pos": "noun"
        },
        {
          "es": "resolver",
          "en": "to resolve",
          "pos": "verb"
        },
        {
          "es": "estar preocupado",
          "en": "to be worried",
          "pos": "phrase"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "haber",
          "tense_id": "subj_presente",
          "forms": {
            "yo": "haya",
            "tu": "hayas",
            "el": "haya",
            "nosotros": "hayamos",
            "vosotros": "hayáis",
            "ellos": "hayan"
          }
        },
        {
          "verb": "hablar",
          "tense_id": "subj_perfecto",
          "forms": {
            "yo": "haya hablado",
            "tu": "hayas hablado",
            "el": "haya hablado",
            "nosotros": "hayamos hablado",
            "vosotros": "hayáis hablado",
            "ellos": "hayan hablado"
          }
        },
        {
          "verb": "comer",
          "tense_id": "subj_perfecto",
          "forms": {
            "yo": "haya comido",
            "tu": "hayas comido",
            "el": "haya comido",
            "nosotros": "hayamos comido",
            "vosotros": "hayáis comido",
            "ellos": "hayan comido"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "subj_perfecto",
          "forms": {
            "yo": "haya vivido",
            "tu": "hayas vivido",
            "el": "haya vivido",
            "nosotros": "hayamos vivido",
            "vosotros": "hayáis vivido",
            "ellos": "hayan vivido"
          }
        },
        {
          "verb": "decir",
          "tense_id": "subj_perfecto",
          "forms": {
            "yo": "haya dicho",
            "tu": "hayas dicho",
            "el": "haya dicho",
            "nosotros": "hayamos dicho",
            "vosotros": "hayáis dicho",
            "ellos": "hayan dicho"
          }
        },
        {
          "verb": "hacer",
          "tense_id": "subj_perfecto",
          "forms": {
            "yo": "haya hecho",
            "tu": "hayas hecho",
            "el": "haya hecho",
            "nosotros": "hayamos hecho",
            "vosotros": "hayáis hecho",
            "ellos": "hayan hecho"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo espero que tú _____ dormido bien.",
          "correct": "hayas",
          "distractor": "has",
          "explanation": "Esperar triggers subjunctive; haber must be in present subjunctive (hayas)."
        },
        {
          "sentence": "Es posible que nosotros _____ hecho algo malo.",
          "correct": "hayamos",
          "distractor": "hemos",
          "explanation": "Impersonal expression triggers subjunctive form of haber."
        },
        {
          "sentence": "No creemos que tú hayas _____ mucho.",
          "correct": "comido",
          "distractor": "comer",
          "explanation": "After haya- forms you need a past participle, not an infinitive."
        },
        {
          "sentence": "Es triste que él no lo _____ pasado.",
          "correct": "haya",
          "distractor": "ha",
          "explanation": "Emotion (es triste) triggers subjunctive; the object pronoun lo goes before haya."
        },
        {
          "sentence": "Es imposible que ellos hayan _____ un libro.",
          "correct": "escrito",
          "distractor": "escribido",
          "explanation": "Escribir has the irregular past participle escrito."
        },
        {
          "sentence": "Es una lástima que ellos no me lo _____ dado.",
          "correct": "hayan",
          "distractor": "han",
          "explanation": "Impersonal triggers subjunctive; both pronouns precede the haber form."
        },
        {
          "sentence": "Ella duda que nosotros _____ venido tan rápido.",
          "correct": "hayamos",
          "distractor": "habíamos",
          "explanation": "Dudar triggers subjunctive in the present, not the past — use hayamos."
        }
      ],
      "caveats": "OCR repeatedly dropped/garbled letters in 'haya/hayas/haber' and verb forms (e.g., 'a' for haya, 'Doro' for dormido); reconstructed from standard forms."
    },
    {
      "chapter_id": "51",
      "slug": "past-perfect-subjunctive",
      "title": "Past Perfect Subjunctive",
      "time_range_sec": [
        14549,
        14730
      ],
      "summary": "The past perfect (pluperfect) subjunctive uses the past subjunctive of haber (hubiera/hubiese series) plus a past participle to express what had happened in the subjunctive form. Both clauses must be in the past, and it commonly appears in past contrary-to-fact si-clauses.",
      "suggested_grammar_note_id": "subjunctive-triggers",
      "rules": [
        {
          "title": "Formation",
          "bullets": [
            "Past subjunctive of haber + past participle.",
            "Two equivalent endings: hubiera/hubieras/hubiera/hubiéramos/hubierais/hubieran OR hubiese/hubieses/hubiese/hubiésemos/hubieseis/hubiesen."
          ]
        },
        {
          "title": "When to use",
          "bullets": [
            "Triggered by W.E.I.R.D. verbs in the past (preterite/imperfect).",
            "Refers to an action completed before another past action.",
            "Used in past contrary-to-fact si-clauses (Si hubiera sabido, lo habría dicho)."
          ]
        },
        {
          "title": "Word order",
          "bullets": [
            "haber + past participle is inseparable.",
            "Negatives and object pronouns go before the hubiera form: 'que yo lo hubiera llamado'."
          ]
        }
      ],
      "examples": [
        {
          "es": "Yo dudaba que tú hubieras llegado.",
          "en": "I doubted that you had arrived.",
          "tags": [
            "doubt"
          ]
        },
        {
          "es": "Tú esperabas que él hubiera ganado el juego.",
          "en": "You hoped that he had won the game.",
          "tags": [
            "esperar-trigger"
          ]
        },
        {
          "es": "¿Había alguien que hubiera visto la película?",
          "en": "Was there anybody who had seen the movie?",
          "tags": [
            "question",
            "irregular-pp"
          ]
        },
        {
          "es": "No había nadie que hubiera dormido.",
          "en": "There was no one who had slept.",
          "tags": [
            "double-negative"
          ]
        },
        {
          "es": "No era cierto que yo lo hubiera llamado.",
          "en": "It was not true that I had called him.",
          "tags": [
            "impersonal",
            "object-pronoun"
          ]
        },
        {
          "es": "Era imposible que hubiéramos hecho eso.",
          "en": "It was impossible that we had done that.",
          "tags": [
            "impersonal",
            "irregular-pp"
          ]
        },
        {
          "es": "Ella no creía que ellos hubieran venido.",
          "en": "She didn't believe that they had come.",
          "tags": [
            "doubt"
          ]
        },
        {
          "es": "Si hubieras estudiado, habrías aprobado.",
          "en": "If you had studied, you would have passed.",
          "tags": [
            "si-clause",
            "contrary-to-fact"
          ]
        }
      ],
      "vocab": [
        {
          "es": "llegar",
          "en": "to arrive",
          "pos": "verb"
        },
        {
          "es": "ganar",
          "en": "to win",
          "pos": "verb"
        },
        {
          "es": "película",
          "en": "movie",
          "pos": "noun"
        },
        {
          "es": "cierto",
          "en": "true/certain",
          "pos": "adj"
        },
        {
          "es": "llamar",
          "en": "to call",
          "pos": "verb"
        },
        {
          "es": "nadie",
          "en": "no one",
          "pos": "noun"
        }
      ],
      "conjugation_tables": [
        {
          "verb": "haber",
          "tense_id": "subj_pluscuamperfecto_1",
          "forms": {
            "yo": "hubiera",
            "tu": "hubieras",
            "el": "hubiera",
            "nosotros": "hubiéramos",
            "vosotros": "hubierais",
            "ellos": "hubieran"
          }
        },
        {
          "verb": "haber",
          "tense_id": "subj_pluscuamperfecto_2",
          "forms": {
            "yo": "hubiese",
            "tu": "hubieses",
            "el": "hubiese",
            "nosotros": "hubiésemos",
            "vosotros": "hubieseis",
            "ellos": "hubiesen"
          }
        },
        {
          "verb": "hablar",
          "tense_id": "subj_pluscuamperfecto_1",
          "forms": {
            "yo": "hubiera hablado",
            "tu": "hubieras hablado",
            "el": "hubiera hablado",
            "nosotros": "hubiéramos hablado",
            "vosotros": "hubierais hablado",
            "ellos": "hubieran hablado"
          }
        },
        {
          "verb": "comer",
          "tense_id": "subj_pluscuamperfecto_1",
          "forms": {
            "yo": "hubiera comido",
            "tu": "hubieras comido",
            "el": "hubiera comido",
            "nosotros": "hubiéramos comido",
            "vosotros": "hubierais comido",
            "ellos": "hubieran comido"
          }
        },
        {
          "verb": "vivir",
          "tense_id": "subj_pluscuamperfecto_1",
          "forms": {
            "yo": "hubiera vivido",
            "tu": "hubieras vivido",
            "el": "hubiera vivido",
            "nosotros": "hubiéramos vivido",
            "vosotros": "hubierais vivido",
            "ellos": "hubieran vivido"
          }
        }
      ],
      "exercises": [
        {
          "sentence": "Yo dudaba que tú _____ llegado.",
          "correct": "hubieras",
          "distractor": "habías",
          "explanation": "Dudar in past triggers past perfect subjunctive of haber."
        },
        {
          "sentence": "No había nadie que _____ dormido.",
          "correct": "hubiera",
          "distractor": "había",
          "explanation": "Negative antecedent (nadie) plus past frame requires past perfect subjunctive."
        },
        {
          "sentence": "No era cierto que yo lo _____ llamado.",
          "correct": "hubiera",
          "distractor": "había",
          "explanation": "Impersonal negation triggers subjunctive; the object pronoun lo precedes hubiera."
        },
        {
          "sentence": "Si tú _____ estudiado, habrías aprobado.",
          "correct": "hubieras",
          "distractor": "habías",
          "explanation": "Past contrary-to-fact si-clause uses past perfect subjunctive."
        },
        {
          "sentence": "Tú esperabas que él _____ ganado el juego.",
          "correct": "hubiera",
          "distractor": "ha",
          "explanation": "Esperar in past + past-of-past meaning needs hubiera + past participle."
        },
        {
          "sentence": "¿Había alguien que _____ visto la película?",
          "correct": "hubiera",
          "distractor": "ha",
          "explanation": "Indefinite/uncertain antecedent in past triggers past perfect subjunctive."
        }
      ],
      "caveats": "OCR garbled hubiera/hubiéramos repeatedly (e.g., 'hubié amg', 'hu¥ieran') and dropped tildes; reconstructed from standard conjugation."
    },
    {
      "chapter_id": "52",
      "slug": "the-conclusion",
      "title": "The Conclusion",
      "time_range_sec": [
        14730,
        14810
      ],
      "summary": "Closing remarks for the Spanish fundamentals series. The narrator emphasizes that the series teaches how to THINK in Spanish (not just speak), explains the deliberate fast-paced format, and encourages learners to use these fundamentals as the basis for whatever mastery method fits them.",
      "suggested_grammar_note_id": null,
      "rules": [],
      "examples": [],
      "vocab": [],
      "conjugation_tables": [],
      "exercises": [],
      "caveats": "Outro chapter only — no grammar content."
    }
  ]
}