#wheijx.

`**` QKTD 

`(+)` S + was/were + V-ing + ...

`(-)` S + wasn't/weren't + V-ing + ...

`(?)` (wh) + was/were + S + V-ing + ... ?

`**` QKD 

`(+)` S + V-ed/c2 + ...

`(-)` S + didn't + V-inf + ...

`(?)` (wh) + did + S + V-inf + ... ?

`8.` Was she studying English at 8p.m yesterday ?

`-` at + giờ

`-` Dấu hiệu QKTD : at 8p.m yesterday

`9.` She saw an accident while she was watching television.

`-` While + S + was/were + V-ing , S + V-ed/c2 + ...

`-` Dùng để diễn tả 1 hành động đang xảy ra thì 1 hành động khác xen vào.

`10.` What was your little brother do at this time yesterday ?

`-` Dấu hiệu QKTD : at this time yesterday

`11.` The doorbell rang while she was eating lunch.

`12.` Were your friends drinking juice when you arrived ?

`13.` What was Ashley doing while her sister was going to Ha Noi ?

`-` While + S + was/were + V-ing , S + was/were + V-ing

`-` Dùng để diễn tả 2 hành động xảy ra cùng 1 thời điểm ở quá khứ.

`14.` At 9 o'clock last Sunday , I was doing homework.

`-` DHNB QKTD : at 9 o'clock last Sunday.

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, ...

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

8. Was she studying English at 8 p.m yesterday?

9. She saw an accident while she was watching television.

10. What was your little brother doing at this time yesterday?

11. The doorbell rang while she was eating lunch.

12. Were your friends drinking juice when you arrived?

13. What was Asley doing while her sister was going to Ha Noi?

14. At 9 o'clock last Sunday, I was doing my homework.

`color{orange}{~MiaMB~}`