Ответ:

Упражнение 2

1. He isn't do this exercise before.

2. I'm not do this exercise yesterday.

3. We aren't go to school since the first form.

4. We aren't goto school yesterday.

5. You aren't see a horse last week.

6. You are never see a horse.

7. He isn't say that way.

8. He's say that a minute ago.

9. They aren't have breakfast yet.

10. They aren't have breakfast an hour ago.