Bài 4:

1. can

2. can't

3. can't

4. can't

5. can't 

6. can 

7. Can

8. can't

9. can't

10. can

Bài 5:

1. couldn't

2. could

3. couldn't

4, couldn't

5. could

6. couldn't

7. could

8. could

9. couldn't

10. couldn't (?)

11.  couldn't

12. couldn't

13. couldn't

14$.$ could

Bài 6: 

1. won't be able to

2. will be able to

3. will be able to

4. will be able to

5, will be able to

6. won't be able to

7. won't be able to

8. won't be able to 

9. won't be able to

10. will be able to

11. will be able to

12. won't be able to

13. will be able.

Bài 4:

Câu 1,6,7,10 là chọn "can", còn lại là "can't"

Bài 5:

Câu 2,4,5,7,8,9,14 là điền "could", còn lại là "couldn't"

Bài 6:

Câu 2,3,4,5,7,10,11 là điền "will be able to", còn lại là "won't be able to"

(lần sau thì bạn chụp gần một chút nx thì phóng to sẽ dễ đọc hơn á :)))