1. helps(never ; htđ)

2. Did- have( last mont; quá khứ)

3. do(usually: htđ)

4. Does-do( regularly: thường xuyên)

5. do they travel( ko có dấu hiệu thì quá khứ thì là hiện tại)

6. visits( once a week: htđ)

7. travels( three times a year: htđ)

8. wrote( when she lived there)

9. was- got( yesterday: qkđ)

10. Was- be( when: qkđ)
11. didn't do( yesterday: qkđ)
12. did youleave( last)

13. stopped- bought( a few minutes ago: qkđ)

14. became( five years ago: qkđ)

15. Did- go/ went- didn't enjoy( last night: qkđ)

16. did receive( last week: qkđ)

17. do(often: htđ)

18. weren't -were( last week: qkđ)

19. were- couldn't sleep( last night: qkđ)

20. taught( two years ago: qkđ)

Những câu trên thì quá khử ở dạng phủ định, nghi vấn nên ko chia nhé!

Bn học tốt!!!

Vote 5* và hay nhất cho mik nhé!!!

1. helps

2. did you have 

3. do they usually do

4. Has Alexander done 

5. do they travel

6. visits

7. travels

8. was writing

9. were

10. Was - were being

11. didn't do

12. did you left

13. stopped - bought

14. became

15.Did you go - went - didn't enjoy

16. did Eward received

17. do you often do

18. weren't be - were

19. was - cannot slept

20. taught