m.c.Δt=m.c.(t_cb-t₁)

17 với 21 đúng mà 'I can fly'

1.Tom said his father had just come back home

2.Linh asked me  How often I went on holiday

3.Linh said she had to go right then of she would be late for work

4.Mai asked Hoa Where she was going then

5.Nhi asked Mai How long  it had taken she to go to the cinema the night before

6.Lan asked her mother if she could prepare a lunch box for me

7.Jenny said his class had had a test the day before

8.Nhi asked Mai if she had ever seen  a real lion before(đề bài thiếu chủ ngữ 'you' nhé)

1.isn't he?

2.aren't we?

3.do I?

4.shall we?

5.has they?

6.does she?

7.do they?

8.isn't he

9.shouldn't we?

10.haven't you?

11.doen't he?

12.isn't it?

13.will they?

14.are  you?

15.doesn't she?

16.aren’t I?

17.didn't they?

18.can't they?

19.isn't it?

20.was it?

21.hadn't he?

22.isn't there?