Câu láy đuôi sang câu nghi vấn : 1) let's walk to school,shall we ? 2) they were not ill ,were they ? 3) no one helped you,did they ? 4) some one has locked the door ,hasn't they ? 5) you don't like her ,do you ? 6) their parents work here ,don't they ? 7) nga has much time ,doesn't Nga ? 8) you went to HN last week,didn't you ? 9) she hardly goes swimming ,doesn't you 10) i am not good at English ,am i 11) i am fatter than you ,aren't i? 12) she seldom talked tone ,did she ? 13) Every thing 14. Nobody invited him ,did they ? 15. Don't tell him ,do i ? 16. go with me ,don't you? 17. you had to cook ,hadn't you 18. They had finisted it be for you came; hadn't they 19 .have to help her, haven't you 20 . She has not drink milk yet, has she