Công thức thì QKĐ (V: to be)

(+) S + was/were + ... 

(-) S + was/were + not ... 

(?) Was/Were + S ... ? 

S số ít, I, he, she, it + was

S số nhiều, you, we ,they + were

Công thức thì QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

-------------------------------------------------

1. began 

DHNB: ago 

2. lost

DHNB: yesterday morning 

3. visited

DHNB: last year 

4. were

DHNB: in 1978

5. Did / spend 

DHNB: last summer 

6. cleaned

DHNB: yesterday 

7. started

DHNB: in 1998

8. went

DHNB: last week 

9. spent 

DHNB: last Sunday 

10. was

DHNB: last year

11. died 

DHNB: in 1930

12. worked 

DHNB: ago 

13. did 

DHNB: last night 

14. wrote

DHNB: last Monday 

15. bought 

DHNB: last year

16. read

DHNB: yesterday 

17. listened

DHNB: last night 

18. watched

DHNB: last night 

19. went

DHNB: yesterday 

20. was

DHNB: last month

21. went

DHNB: last week 

22. had 

DHNB: yesterday 

23. met

DHNB: ago 

24. was

DHNB: in 1992

25. did you do 

DHNB: last night

26. studied

DHNB: last summer

27. didn't visit

DHNB: last week

28. was

DHNB: in 1997

29. built 

DHNB: ago 

30. didn't do 

DHNB: last Sunday