các bạn giúp minh bài này với

Công thức thì QKTD 

(+) S + was/were + Ving 

(-) S + was/were+ not + Ving 

(?) Was/Were +S +Ving? 

--> Diễn tả hành động đang xảy ra ở 1 thời điểm nào đó trong quá khứ 

--> Diễn tả hành động đang xảy ra thì có hành động khác chen vào (while / when)

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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1. fell / hurt

2. shook / said

3. were eating / saw

4. telephoned / was having

5. won / lost 

6. rented / rode 

7. were travelling / heard 

8. was travelling / approached 

9. was talking / saw

10. lost / found

11. was watching / came 

12. was preparing / called 

13. arrived / were waiting

14. told / woke up 

15. wanted / chose

16. went out / went 

17. went / were / eating

18. was / doing /  knocked 

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