Giải giúp mik với đg cần gấp ạ

Công thức thì QKTD 

(+) S + was/were + Ving 

(-) S + was/were+ not + Ving 

(?) Was/Were +S +Ving? 

DHNB: at + giờ + thời gian trong QK, at this time + thời gian trong QK, ...

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, ...

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9. didn't close

DHNB: yesterday (QKD)

10. weren't returning

DHNB: at 7pm last Monday (QKTD)

11. didn't eat

DHNB: yesterday (QKD)

12. didn't come

DHNB: ago (QKD)

13. went

DHNB: last week (QKD)

14. didn't have

15. Did Lan and Hoa go 

DHNB: last Monday (QKD)

16. did they play

DHNB: last week (QKD)

17. did Hoa try 

DHNB: yesterday (QKD)

18. talked

DHNB: last Monday (QKD)

19. did they stop 

DHNB: last Sunday (QKD)

20. did the students wear

DHNB: ago (QKD)

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