1. Switched off - was making
2. Was listening - arrived
3. Were playing - said
4. Met - was living
5. Was drawing - was studying
6. Were trying - went out
7. Left - was pouring
8. Saw - was he wearing
9. Was trying - stopped
10. Was printing - ran out
—
1. Was trying 
2. ran out
3. laid 
4. Was - chatting
5. Didn’t concentrate
6. Forgot
7. Went
8. Lost
9. Screamed
10. Came
11. Was - crying
12. Gave
13. Tried
14. Was 
15. Had managed 

-> Thì QKHT diễn tả hành động đã xảy ra trước hành động khác trong quá khứ

—

Công thức thì QKTD: 

1. Câu khẳng định S + was/were + V-ing.

2. Câu phủ định S + was/were + not + V-ing

3. Câu nghi vấn

Q: Was / Were + S + V-ing?

A: Yes, S + was/were.

     No, S + wasn’t/weren’t.

---

Cách sử dụng thì QKTD: 

1. Diễn đạt hành động đang xảy ra tại một thời điểm trong quá khứ tiếp diễn. Trong câu xuất hiện trạng từ while + mệnh đề chia thì quá khứ tiếp diễn, ta chia mệnh đề còn lại theo thì quá khứ tiếp diễn để diễn tả 2 hành động xảy ra cùng 1 lúc trong quá khứ

2. Diễn đạt hai hành động xảy ra đồng thời trong quá khứ

3. Diễn đạt hành động đang xảy ra thì có hành động khác xen vào

4. Hành động lặp đi lặp lại trong quá khứ và làm phiền đến người khác

`7.`

`1.` Switched off - was making

`2.` Was listening - arrived

`3.` Were playing - said

`4.` Met - was living

`5.` Was drawing - was studying

`6. `Were trying - went out
`7.` Left - was pouring

`8.` Saw - was he wearing

`9.` Was trying - stopped

`10.` Was printing - ran out

`8.`

`1.` Was trying

`2.` ran out

`3.` laid

`4.` Was - chatting

`5.` Didn’t concentrate

`6.` Forgot

`7.` Went

`8.` Lost

`9.` Screamed

`10.` Came

`11.` Was - crying

`12.` Gave

`13.` Tried

`14.` Was

`15.` Had managed

`=>` Dựa vào công thức thì `QKTD`