1. When I (arrive) at this house, he still (sleep) 2. The light (go) out while we (have) dinner. 3. Bill (have) breakfast when I (stop) at this house this morning. 4. When I (come) to his house, he (work) 5. As we (cross) the street, we (see) an accident. 6. Tom (see) a serious accident while he (stand) at the bus stop. 7. The children (play) football when their mother (come) back home. 8. The bell (ring) while Tom (take) a bath. 9. He (sit) in a car when I (see) him. 10. We (clean) the house when she (come) yesterd

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, ...

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

1. arrived / was sleeping

2. went / were having

3. was having / stoped 

4. came / was working

5. were crossing / saw 

6. saw / was standing

7. were playing / came 

8. rang / was taking 

9. was sitting/saw 

10. were cleaning / came 

`color{orange}{~LeAiFuRuiHuiBao~}`