{
  "noteId": "stem-changing-verbs",
  "target_count": 30,
  "seed_count": 6,
  "generated_count": 24,
  "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."},
    {"sentence": "Yo _____ en español. (pensar)", "correct": "pienso", "distractor": "penso", "explanation": "Pensar is e→ie; yo form is pienso."},
    {"sentence": "Tú _____ café por la mañana. (querer)", "correct": "quieres", "distractor": "queres", "explanation": "Querer is e→ie; tú form is quieres."},
    {"sentence": "El profesor _____ la puerta. (cerrar)", "correct": "cierra", "distractor": "cerra", "explanation": "Cerrar is e→ie; él form is cierra."},
    {"sentence": "Yo _____ frío en invierno. (sentir)", "correct": "siento", "distractor": "sento", "explanation": "Sentir is e→ie; yo form is siento."},
    {"sentence": "Nosotros _____ jugar mañana. (poder)", "correct": "podemos", "distractor": "puedemos", "explanation": "Nosotros keeps the original stem: podemos."},
    {"sentence": "Mis hijos _____ ocho horas. (dormir)", "correct": "duermen", "distractor": "dormen", "explanation": "Dormir is o→ue; ellos form is duermen."},
    {"sentence": "Ella _____ una historia divertida. (contar)", "correct": "cuenta", "distractor": "conta", "explanation": "Contar is o→ue; ella form is cuenta."},
    {"sentence": "Yo _____ a casa después de clase. (volver)", "correct": "vuelvo", "distractor": "volvo", "explanation": "Volver is o→ue; yo form is vuelvo."},
    {"sentence": "Tú _____ un café en el bar. (pedir)", "correct": "pides", "distractor": "pedes", "explanation": "Pedir is e→i; tú form is pides."},
    {"sentence": "El camarero _____ la comida. (servir)", "correct": "sirve", "distractor": "serve", "explanation": "Servir is e→i; él form is sirve."},
    {"sentence": "Los estudiantes _____ las palabras. (repetir)", "correct": "repiten", "distractor": "repeten", "explanation": "Repetir is e→i; ellos form is repiten."},
    {"sentence": "Yo _____ al tenis los domingos. (jugar)", "correct": "juego", "distractor": "jugo", "explanation": "Jugar is u→ue; yo form is juego."},
    {"sentence": "Ella _____ al baloncesto. (jugar)", "correct": "juega", "distractor": "juga", "explanation": "Jugar is u→ue; ella form is juega."},
    {"sentence": "Nosotros _____ la verdad. (decir)", "correct": "decimos", "distractor": "dicimos", "explanation": "Nosotros keeps the original stem: decimos."},
    {"sentence": "Vosotros _____ pronto. (dormir)", "correct": "dormís", "distractor": "duermís", "explanation": "Vosotros keeps the original stem: dormís."},
    {"sentence": "Mi madre _____ a las seis. (volver)", "correct": "vuelve", "distractor": "volve", "explanation": "Volver is o→ue; ella form is vuelve."},
    {"sentence": "Ellos _____ ir al parque. (querer)", "correct": "quieren", "distractor": "queren", "explanation": "Querer is e→ie; ellos form is quieren."},
    {"sentence": "Yo _____ ayuda a mi profesor. (pedir)", "correct": "pido", "distractor": "pedo", "explanation": "Pedir is e→i; yo form is pido."},
    {"sentence": "Tú _____ que es importante. (pensar)", "correct": "piensas", "distractor": "pensas", "explanation": "Pensar is e→ie; tú form is piensas."},
    {"sentence": "Vosotros _____ café con leche. (servir)", "correct": "servís", "distractor": "sirvís", "explanation": "Vosotros keeps the original stem: servís."},
    {"sentence": "Ella _____ ocho horas cada noche. (dormir)", "correct": "duerme", "distractor": "dorme", "explanation": "Dormir is o→ue; ella form is duerme."},
    {"sentence": "Los chicos _____ pizza para cenar. (pedir)", "correct": "piden", "distractor": "peden", "explanation": "Pedir is e→i; ellos form is piden."},
    {"sentence": "Yo _____ la puerta con llave. (cerrar)", "correct": "cierro", "distractor": "cerro", "explanation": "Cerrar is e→ie; yo form is cierro."},
    {"sentence": "Tú _____ del trabajo a las cinco. (volver)", "correct": "vuelves", "distractor": "volves", "explanation": "Volver is o→ue; tú form is vuelves."},
    {"sentence": "Nosotros _____ una historia increíble. (contar)", "correct": "contamos", "distractor": "cuentamos", "explanation": "Nosotros keeps the original stem: contamos."}
  ]
}
