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.