Công thức thì Qúa khứ thường (Qúa khứ đơn) :

(+) S + V - ed

(-) S + didn't + V (inf)

(?) Did + S + V (inf)

*Có một số động từ khi chia ở thời quá khứ sẽ bất quy tắc như : eat `->` ate ; go `->` went ; do `->` did ; ....

Dấu hiệu nhận biết : ago , last + time , yesterday , ....

Làm bài :

1.spent

2.went

3.watched

4.met

5.did

6.bought

7. had

8.went

9.Did/have

10.Did/take

11.Did/buy

12.Did/put

13.ate

14.Did/return

15.went

16.got

17.did/go

18.didn't go

19.met

20.didn't buy

21.did/go

22.did/do

23.was

24.wasn't

25.were

=>

1. spent

2. went 

3. watched 

4. met

5. did

6. bought

7. had

8. went

9. Did he have

10. Did his uncle take

11. Did Liz buy 

12. Did they put

13. ate

14. Did Nam return

15. went 

16. got

17. did you go

18. didn't go/did not go

19. met

20. didn't buy/did not buy

21. did/go

22. did you do

23. was

24. wasn't/was not

25. were 

Thì QKĐ

Đối với động từ tobe

(+) S was/were...

(-) S was/were not...

(?) Was/Were S...?

Đối với động từ thường

(+) S V2/ed

(-) S didn't V

(?) Did S V?

Một số động từ bất quy tắc:

spend - spent - spent

go - went - gone

meet - met - met

buy - bought - bought

do - did - done

have - had - had

take - took - taken

get - got - got

Chủ ngữ số nhiều -> dùng were 

Chủ ngữ số ít -> dùng was