14. H e hardly ever leaves the house,__________________________?
15. Your central heating doesn’t work very well,_________________?
16. Ann’s on holiday,_______________________?
17. You weren’t listening,___________________________? 
18. Sue doesn’t like onions,_____________________?
19. Jack’s applied for the job,____________________?
20. You’ve got a camera,___________________________?
21. You can type,__________________?
22. He won’t mind if I go early,_________________?
23. Tom could help you,__________________________?
24. There are a lot of people there,__________________?
25. Let’s have dinner,______________________?
26. This isn’t very interesting,______________________? 
27. George Washington was the first President of the United States, __________?
28. He’d never seen you before,______________________?
29. He hardly ever makes a mistake,___________________?
30. Nobody went to the party,_______________________

giải:

14, doesn't he

15, does it

16, isn't she

17, were you

18, does she

19, isn't he

20, aren't you

21, can't you

22, will he

23, couldn't he

24, aren't they

25, shall we

26, is it

27, wasn't he

28, had he

29, does he

30, did they 

công thức:

-(mệnh đề khẳng định), modal + not + S?

-(mệnh đề phủ định), phương thức + S?