`6.` was reading - was learning - was doing 

`7.` were playing - came 

`8.` rang- was taking 

`9.` were you doing 

`10.` was- had 

`11.` was sitting - saw

`12.` didn't you listen- was speaking 

`13.` was having

`14.` had

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

`-` QKTD + while + QKTD.

-> Diễn tả 2 hành động quá khứ diễn ra cùng  1 thời điểm, song song nhau

`-` QKTD + when + QKĐ.

-> Diễn tả hành động quá khứ này đang diễn ra thì hành động quá khứ khác xen vào.

- QKĐ:

S+ V2/V-ed+O

- QKTD:

S+ was/were+ V-ing+O

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: 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, ...

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

6. was reading / was learning / was doing 

7. were playing / came 

8. rang / was taking 

9. were you doing 

DHNB: at this time last Sunday (QKTD)

10. was / had

DHNB: yesterday (QKD)

11. was sitting / saw 

12. didn't you listen / was speaking

13. was having 

DHNB: at 7 a.m last morning (QKTD)

14. had 

DHNB: last summer holiday (QKD)

`color{orange}{~MiaMB~}`