Would like someone to answer who's fluent in spanish!

1. what must come after the construction acabar de?

a conjugated verb

an infinitive

2. ir a + (infinitive) is a

useful phrase to tell what someone is going to do

useful phrase to tell what someone is doing

useful phrase to tell what someone did

3. choose the sentence that is grammatically correct

voy comprar una camisa.

voy a comprar una camisa.

voy a compro una camisa.

4. choose the sentence that is grammatically correct

mis amigos comen todos los días.

mis amigos coman todos los días.

mis amigos comemos todos los días.

5. pick the best translation of the following: acabamos de hablar con maría

we will talk to maria

we just talked to maria

we are talking to maria