`1.` left/was snowing 

`->` When + thì QKĐ, thì QKTD

`2.` arrived/was talking

`->` When + thì QKĐ, thì QKTD

`3.` were you doing/entered 

`->` When + thì QKĐ, thì QKTD

`4.` had

`-> "last month" => thì QKĐ

`5.` am hurrying/stopped

`->` When + thì QKĐ, thì QKTD

`6.` were running/shouted 

`->` When + thì QKĐ, thì QKTD

`7.` noticed/came

`8.` was going/remembered 

`->` When + thì QKĐ, thì QKTD

#Chii

#Tired of studying well

1. When Mrs Reynolds left the house this morning, it had been snowing.

2. When the two girls arrived, I was talking to Rachel.

3. What did you do at 9:30 when the robbers entered the bank?.

4. Will and Martin had a great time in Rome last month.

5. I hurried to the airport when two policemen stopped me.

6. The students were running in the corridor when the teacher shouted at them.

7. I noticed that smoke came out of the window.

8. Paul was going to bed when he remembered to call his boss.

`→` Thì QKD :

(+) S + was/ were +…

(-) S + was/ were + not +...

(?) Was/ Were + S +…?

`→` Thì QKTD :

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

(-) S + was/were + not + V-ing

(?) Was / Were + S + V-ing?