Respostas

2014-07-08T11:45:28-03:00
We didn't decide if we're going to travel next holiday
2014-07-08T17:26:46-03:00
We didn't decide if we're going to travel next holiday.

PS: Em qualquer frase que tenha did ou didn't não precisamos colocar o verbo no past, pois o verbo auxiliar did já faz esse trabalho.

Exemplos: We didn't study yesterday.
                 Did you "study" yesterday?
                 No, I didn't (Num caso de resposta, não precisaria colocar "didn't do" e                          sim apenas "didn't)