Answer:
3. fuiste
5. vamos a ir
6. fuimos
8. voy a ir
10. fui
Step-by-step explanation:
For this type of future tense, you only need to add "a ir" to the end of your conjugated "ir" verb.
For the preterite, remember that the conjugations are as follows:
Yo fui I went
Tú fuiste you went
Ella / Él / Usted fue s/he went, you (formal) went
Nosotras / Nosotros fuimos