1 They have finished the work before the requested time , haven't they

2 You were doing hw at 8 clock last night ,were you 

3 is this your car, isn't it 

4 

5 this car is made in japan , isnt it

6 HLB was recognized as the world heritage site in 1999 , wasnt it

7 we have to stay at home anh do hw , dont we

8 did he know the answer for this ploblem ?

9 Are Nam and lan playing compute game now?

10 Are these cars made in usa?

11 Is this computer very mordem ?

12 You are going to da lat next summer , arent you

13 Do you like this film?

17. won't you

18. haven't they

20. weren't you

30. isn't it

31. isn't there

32. isn't it

33. wasn't it

34. don't we

39. aren't you