Ответ:

Упражнение 1

1. They are playing tennis
2. I saw them in the park
3. Put them on the shelf
4. They are on the shelf
5. We have seen it
6. It is very interesting
7. She went to the post-office
8. I am waiting for her
9. We listened to him with great interest
10. He explains a new grammar rule

Упражнение 2

1. This school is ours
2. This note-book is mine
3. This desk is yours
4. This bicycle is his
5. This bag is hers
6. This classroom is theirs
7. This bus is ours
8. This suggestion is hers

Упражнение 3

1. I shall go to the post-office myself
2. She cooks breakfast herself
3. We shall water the flowers ourselves
4. The soldiers built the bridge themselves
5. Mother said to the boy: "You must always make your bed yourself"
6. In your place? I should go there myself
7. The professor performed the operation himself
8. The chief engineer went to the ministry himself