`6.` Has; tried

`7.` Did; go

`8.` have; been

`9.` have travelled

`10.` have been

`11.` Have; finished

`12.` came; told

`13.` have visited; went; was; haven't visited

`14.` did; come

`15.` came

`16.` Did, watch

`17.` have; left

`18.` have known

`19.` met; have known

`20.` happened

`21.` Did; read

Trong bài này sử dụng thì hiện tại hoàn thành và thì quá khứ đơn

*Công thức thì hiện tại hoàn thành:

Khẳng định:

S + have/has + `V_3`/V-ed

`+` S = I/You/We/They + have

`+` S = She/He + has

Phủ định:

S + haven't/hasn't + `V_3`/V-ed

Trong đó:

`-` haven't: have not

`-` hasn't: has not

Câu nghi vấn:

Have/has + S + `V_3`/V-ed

`+` Yes, S + have/has

`-` No, S + haven't/hasn't

Công thức thì quá khứ đơn:

Khẳng định:

I/you/we/they/he/she/it + V-ed (studied)

Phủ định:

I/you/we/they/he/she/it + did not/didn't + V

Câu nghi vấn và câu trả lời ngắn:

Did + I/you/we/they/he/she/it + V?

+ Yes, I/you/we/they/he/she/it + did

- No, I/you/we/they/he/she/it + didn't

CHÚC BẠN HỌC TỐT!

6. Has | tried

7. Did | go

8. have | been

9. have travelled

10. has been married

11. Have | finished

12. came | told

13. have visited | went | was | haven't visited

14. did | come

15. came

16. Did | watch

17. have | left

18. have | known

19. met | have known

20. happened

21. Did | read