Ответ:

2.is, isn't

3.are , i am

4.are , aren't

5. are, aren't

Ответ:

1) Are they writing songs? Yes, they are.

2) Is Ben acting? No, he isn't.

3) Are you making a film? Yes, I am.

4) Are we buying the tickets? No, we aren't.

5) Are they studying? No, they aren't.

Объяснение:

Согласование.