Ответ:

1. couldn't

2. can

3. could

4. can't

5.can't

6. can

7. could

8. can't

9. could

1. When I was a child I couldn't swim well, but now I can.

2. Garry can drive well. He's a good driver.

3. Could you play football when you were 8 years old?

4. Lina didn't do her homework because she can't find her book.

5. Sorry, I can't help you. I'm busy now.

6. What can you do now that you couldn't do 5 years ago?

7. Susan can't sing now, but she could do it when she was a child.

8. Cats can climb trees, but I can't.

9. What could Nina do when she was 3?