Combine the sentences and add the correct punctuation. Use while.

1.a.
We felt an earthquake while we were sitting in our living room last night .

b. While
we were sitting in our living room , we felt an earthquake.

2.a.
While I was talking to the teacher yesterday , another student interrupted me.

b.
Another student interrupted me while I was talking to the teacher yesterday.

3.a. While
I was planting flowers in the garden , my dog began to bark at a squirrel.

b. M
y dog began to bark at a squirrel while I was planting flowers in the garden.

4.a.
A police officer stopped another driver for speeding while we were driving to work.

b. While
we were driving to work , a police officer stopped another driver for speeding.

5.a. While
I was walking in the forest , a dead tree fell over .

b. A
dead tree fell over while I was walking in the forest.

(Tư liệu tham khảo:
Betty Schrampfer Azar . Understanding and Using English. 3rd ed.)


Review exercise