Nos gustan la clase de hisoria.
Would lit be gustan or gustaba?
3 Answers
It could be gusta, gustó, or gustaba. But not gustan. The subject is "la clase", so the verb has to be 3rd person singular, in whatever tense is appropriate.
I will be honest with you, on this you are not comparing equivalent tenses, and this is more complicated than your other.
If you are try for present tense:
No nos gusta la clase de historia. We do not like the history class.
If you are trying to do past tense:
No nos gustó la clase de historia. We did not like the history class.
Or
No nos gustaba la clase de historia, pero ahora nos gusta. We used to not like the history class, but now we do.
Nos gustan la clase de historia = We like history class. Nos is a reflesive pronoun here. It's like Me Peino, Me baño, Nos gustan is correct. It is a reflexive pronoun of Nosotros (we)