Ответ:

1. Yes, he was. No, he wasn't.

2. Yes, he can. No, he can't.

3. Yes, they will. No, they won't.

4. Yes, I do. No, I don't.

5. Yes, they are. No, they aren't.

6. Yes, I did. No, I didn't.

7. Yes, it is. No, it isn't.

8. Yes, they were. No, they weren't.