{
  "noteId": "estar-gerund-progressive",
  "target_count": 30,
  "seed_count": 6,
  "generated_count": 24,
  "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."},
    {"sentence": "Yo _____ estudiando para el examen. (estar, present)", "correct": "estoy", "distractor": "soy", "explanation": "Progressive always uses estar, not ser."},
    {"sentence": "¿Qué _____ haciendo tú? (estar, present)", "correct": "estás", "distractor": "eres", "explanation": "Tú estás for present progressive."},
    {"sentence": "El camarero está _____ la comida. (servir)", "correct": "sirviendo", "distractor": "serviendo", "explanation": "Stem-change e→i in the gerund of servir."},
    {"sentence": "Yo estoy _____ música. (oír)", "correct": "oyendo", "distractor": "oiendo", "explanation": "i→y between vowels: oír → oyendo."},
    {"sentence": "Ella está _____ al supermercado. (ir)", "correct": "yendo", "distractor": "iendo", "explanation": "Irregular gerund of ir is yendo."},
    {"sentence": "Mi padre está _____ el jardín. (regar)", "correct": "regando", "distractor": "regiendo", "explanation": "-ar verb forms gerund with -ando."},
    {"sentence": "Los chicos están _____ al fútbol. (jugar)", "correct": "jugando", "distractor": "juegando", "explanation": "No stem change in gerund of jugar."},
    {"sentence": "Nosotros estamos _____ una película. (ver)", "correct": "viendo", "distractor": "veiendo", "explanation": "Gerund of ver is viendo (regular -er)."},
    {"sentence": "Estaba _____ cuando sonó el teléfono. (cocinar)", "correct": "cocinando", "distractor": "cocinado", "explanation": "Past progressive: imperfect estar + gerund."},
    {"sentence": "Los abuelos estaban _____ en el sofá. (descansar)", "correct": "descansando", "distractor": "descansado", "explanation": "Past progressive uses the gerund, not the participle."},
    {"sentence": "Mañana _____ a la playa. (ir, present for future)", "correct": "voy", "distractor": "estoy yendo", "explanation": "Spanish doesn't use progressive for future plans."},
    {"sentence": "Ahora mismo ella está _____ una carta. (escribir)", "correct": "escribiendo", "distractor": "escribendo", "explanation": "-ir verbs form the gerund with -iendo."},
    {"sentence": "Estoy _____ por el parque. (caminar)", "correct": "caminando", "distractor": "caminado", "explanation": "Gerund of caminar is caminando."},
    {"sentence": "El bebé está _____. (morir)", "correct": "muriendo", "distractor": "moriendo", "explanation": "Stem-change o→u in gerund of morir."},
    {"sentence": "Sigo _____ español todos los días. (estudiar)", "correct": "estudiando", "distractor": "estudiado", "explanation": "Seguir + gerund expresses 'keep on doing'."},
    {"sentence": "Llevo dos horas _____ aquí. (esperar)", "correct": "esperando", "distractor": "esperado", "explanation": "Llevar + time + gerund expresses duration."},
    {"sentence": "Ella está _____ a su jefe. (seguir)", "correct": "siguiendo", "distractor": "seguiendo", "explanation": "Stem-change e→i in gerund of seguir."},
    {"sentence": "Estoy _____ tu mensaje ahora. (leer)", "correct": "leyendo", "distractor": "leiendo", "explanation": "i→y between vowels in gerund of leer."},
    {"sentence": "_____ estoy haciendo. (it = lo)", "correct": "Lo", "distractor": "Le", "explanation": "Direct object pronoun lo can precede estar."},
    {"sentence": "Estoy _____ ahora mismo. (haciéndolo / hacerlo)", "correct": "haciéndolo", "distractor": "hacerlo", "explanation": "Pronoun attaches to the gerund (with accent)."},
    {"sentence": "¿Qué estabas _____ anoche? (hacer)", "correct": "haciendo", "distractor": "hecho", "explanation": "Past progressive uses gerund, not past participle."},
    {"sentence": "Mi hermana está _____ a un bebé. (esperar)", "correct": "esperando", "distractor": "esperado", "explanation": "Present progressive uses gerund -ando."},
    {"sentence": "Los profesores están _____ a los alumnos. (corregir)", "correct": "corrigiendo", "distractor": "corregiendo", "explanation": "Stem-change e→i in gerund of corregir."},
    {"sentence": "Estoy _____ que aprender más. (necesitar — but use 'tener')", "correct": "teniendo", "distractor": "tenendo", "explanation": "-er verbs form gerund with -iendo: teniendo."}
  ]
}
