Hizo vs hiciera
Anoche mis padres nos prohibieron que nosotros viéramos televisión hasta que mi hermano (hizo/hiciera) toda la tarea.
I think this sentence translates to last night my parents prohibited that we watch television until my brother finished his homework. The answer was hiciera according to the answer key, but I chose hizo because prohibieron is in the past tense, so doesn't the verb after hasta que have to be in the past tense/ preterite? Someone once told me that each verb determines what tense the next verb after it is. I have a hard time choosing what tense to use after a verb conjugated in the subjunctive like viéramos.
2 Answers
Anoche mis padres nos prohibieron que nosotros viéramos televisión hasta que mi hermano (hizo/hiciera) toda la tarea.
This sentence is very awkward because of the first part. It sounds better as: Anoche mis padres nos prohibieron ver televisión .......... / Anoche mis padres prohibieron que vieramos televisión ......
The second part should use subjunctive hiciera because it is a past action yet to take place. Also note that another way to say this part is with double negative: .... hasta que mi hermano no hiciera ....
You forgot the "trigger" hasta que. As the brother had as yet not finished all his homework, the action was at that time in the future and at that point in time unsure, so the imperfect subjunctive was needed.
