Giải giúp với mn ơi

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, ...

Công thức thì HTHT

(+) S + has/have + V3/ed 

(-) S + has/have + not + V3/ed 

(?) Has/Have + S+ V3/ed?

DHNB: before, since + mốc thời gian, for + khoảng thời gian, yet, already, just,....

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EX1:

1. bought

DHNB: last week (QKD)

2. have studied

DHNB: so far (HTHT)

3. were you 

DHNB: last night (QKD)

4. didn't attend

DHNB: last month (QKD)

5. Did your family move 

DHNB: ago (QKD)

6. received

DHNB: yesterday (QKD)

7. Have you finished

DHNB: yet (HTHT)

8. had

DHNB: yesterday (QKD)

9. have waited / didn't arrive

HTHT + since + QKD
10. haven't contacted

DHNB: for a long time (HTHT)

11. Have you ever heard

DHNB: ever (HTHT)

12. haven't visited
Since + QKD, HTHT

13. went

DHNB: last night (QKD)

14. was

DHNB: in 1963 (QKD)

15. lost / hasn't found 

DHNB: yesterday (QKD) - yet (HTHT)

16. broke

DHNB: last week (QKD)

17. has just left

DHNB: just (HTHT)

18. made

DHNB: yesterday (QKD)

19. haven't seen

DHNB: for ages (HTHT)

20. Did you go 

DHNB: last night (QKD)

EX2:

1. B

DHNB: yesterday (QKD)

2. B, D 

HTHT + since + QKD

3. B

DHNB: just (HTHT)

4. C, D 

HTHT + since + QKD

5. A

DHNB: yesterday (QKD)

6. A

QKD + when + QKD

7. A

DHNB: last week (QKD)

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