Đáp án + Giải thích bước giải:

`Ex` `9.`

`1.` while

`2.` when

`3.` while

`4.` when

`5.` when

`Ex` `10.`

`1.` was preparing - came

`2.` was shining brightly - got up

`3.` told

`4.` were driving

`5.` fell - broke

`6.` were talking - walked

`7.` entered - was having 

* Kết hợp thì QKĐ - QKTD (Khi có 1 hành động đang xảy ra thì bất chợt có hành động khác xen vào)

`-` While + thì QKTD; When + thì QKĐ

`-` CT thì QKĐ: S + (not) + V2/ed

`-` CT thì QKTD: S + was/were + (not) + V-ing

ex 9.

1. I had a bad dream while I was sleeping on the sofa

2. I was talking to my husband in the park when two cars crashed behind us.

3. You called me last night while I was studying for an important exam.

4. The students were doing an exercise when the bell rang.

5. Anna was doing her homework when  the lights went out.

ex 10.

1. Mary was preparing lunch when they came.

2. The sun was shining brightly when I got up this morning.

3. Ann finally told us the whole story about Peter.

4. We were driving to Berlin in Robert’s new car.

5. Last weekend Susan fell and broke her leg.

6. Who was that nice girl you were talking to when I walked by the pub?

7. When I entered the cafeteria Mary was having lunch with Peter.

-while+QKTD; when+QKĐ

-CT thì QKĐ: S+(not)+V2/ed

 -CT thì QKTD: S+was/were+(not)+v-ing

chúc bạn học tốt!!! .ω.