`17` haven't eaten .

`18` were sleeping .

`19` has worked .

`20` has she eaten .

`21` worked .

`22` haven't finished .

`23` had worked .

`24` has just come .

`25` had bought .

`-` Hiện tại hoàn thành :

`( + )` S + have/has + V3/Vpp + O .

`( - )` S + have/has + not + V3/Vpp + O .

`( ? )` Have/has + S + V3/Vpp + O `?`

`-` Quá khứ đơn :

`( + )` S + was/were + O `/` S + V(quá khứ) + O .

`( - )` S + was/were + not + O `/` S + didn't + V-inf + O .

`( ? )` Was/were + S + O `?` `/` Did + S + V-inf + O `?`

`-` Quá khứ  hoàn thành :

`( + )` S + had + V3/Vpp + O .

`( - )` S + had + not + V3/Vpp + O .

`( ? )` Had + S + V3/Vpp + O `?`

`-` Quá khứ tiếp diễn :

`( + )` S + was/were + V_ing + O .

`( - )` S + was/were + not + V_ing + O .

`( ? )` Was/were + S + V_ing + O `?`

Past Simple: mô tả 1 hđ trong quá khứ

S + V2/ed + O

Dấu hiệu: thời gian trong quá khứ, last + thời gian, time + ago

Present Perfect: mô tả 1 hđ ở quá khứ hoặc hiện tại và sẽ tiếp tục trong tương lai

S + have/has + V3/ed + O

Dấu hiệu: so far, since, yet

Past Perfect: mô tar1 hđ trong quá khứ trc 1 hđ trong quá khứ

S + had + V3/ed + Past Simple

Dấu hiệu: by the way, after, before,...

Past Continuous: mô tả 1 hđ tiếp diễn trong 1 tg nhất định trong quá khứ

S + was/were + V-ing + O

Dấu hiệu: while, when, ...

17. I haven't eaten this food so far

18. were sleeping

19. has worked

20. has eaten

21. worked

22. haven't finished

23. had worked

24. has just came

25. had bought

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