Trả lời:

17, Bill couldn’t have prevented it, could he?

18, Bill hasn’t got a car, has he?

19, There weren’t any mosquitoes, were there?

20, George hadn’t been there before, had he?

21, You would’t mind helping me with this, would you?

22, You take sugar in tea, don't you?

23, But you don’t take it in coffee, do you?

24, It never works very well, does it?

25, Mary hardly ever cooks, doesn't she?

26, She’d save money if she bought fresh food, hadn't she?

27, Neither of them offered to help you, did they?

28, He hardly ever leaves the house, doesn't he?

29, Nothing went wrong, didn't it?

30, There used to be trees here, didn't it?

17 could he

18 has he

19 were there

20 had he

21 would you

22 don't you

23 do you

24 does it

25 does she

26 wouldn't she

27 did they

28 does he

29 did it

30 didn't there