1. often sleep

2. Does he sometimes stay up late?

3. always do

4. never come

5. Why does Johnson always get good marks?

6. Do you usually go shopping?

7. seldom cries

8. never has

Câu trả lời:

1. for

2. for

3. since

4. for

5. since

6. since

7. for

8. since

9. since

10. for 

11. has been sick - since

12. has worked - for

13. has been - for

14. have sent - since

15. hasn't eaten - for

16. have been - since

17. have lived - since

18. has gone - since

19. has lived - for

20. have attended - since

21. haven't seen - for

22. haven't had - for

23. has been - since

are caught