1. Mi mamá me (decir) que sí puedo ir al cine.
Answer 1: Mi mamá me dijo que sí puedo ir al cine. Preterite because is an action ended in the past.
Translation 1: My mom told me that I can go to the cinema.
2. Rogelio siempre (viajar) a Uruguay.
Answer 2: Rogelio siempre viajaba a Uruguay. Imperfect because was a usual (siempre) action in the past.
Translation 2: Rogelio always traveled to Uruguay.
3. La computadora (romperse) cuando la compramos.
Answer 3: La computadora se rompió cuando la compramos. Preterite because is an action ended in the past.
Translation 3: The computer broke when we bought it.
4. Cuando yo era niño (leer) muchos libros.
Answer 4: Cuando yo era niño leía muchos libros. Imperfect because was an action repeated (muchos libros) over a period of time in the past (cuando yo era niño)
Translation 4: When I was a child I read many books.
5. La semana pasada yo (ir) a Costa Rica.
Answer 5: La semana pasada yo fui a Costa Rica. Preterite because is an action ended (semana pasada) in the past.
Translation 5: Last week I went to Costa Rica.
6. La Navidad pasada ella no (recibir) regalos.
Answer 6: La Navidad pasada ella no recibió regalos. Preterite because is an action ended (Navidad pasada) in the past.
Translation 6: Last Christmas, she was not given presents.
7. Cuando yo era joven me (gustar) jugar básquetbol.
Answer 7: Cuando yo era joven me gustaba jugar básquetbol. Imperfect because was an action over a period of time in the past (Cuando era joven)
Translation 7: When I was young I liked to play basketball.
8. Cada invierno mis abuelos (ir) a Florida.
Answer 8: Cada invierno mis abuelos iban a Florida. Imperfect because was a usual (every winter) action in the past.
Translation 8: Every winter my grandparents went to Florida.
9. A menudo mi madre (cocinar) espaguetis.
Answer 9: A menudo mi madre cocinaba espaguetis. Imperfect because was a usual (a menudo) action in the past.
Translation 9: My mother often cooked spaghetti.
10. La chica (hablar) por teléfono cuando (ocurrir) el terremoto.
Answer 10: La chica hablaba por teléfono cuando ocurrió el terremoto. First verb is (imperfect) because is an action that was happening in the past when began another action in the past that ended in the past (preterite)
Translation 10: The girl spoke by phone when the earthquake occurred.