8.　　　 While my schoolmates were playing table tennis , I was making a model plane.

7.　　　 All the time the teacher was writing on the blackboard , the students were copying the sentences.

6.　　　 The Young Pioneers were planting trees from seven to ten o’clock yesterday morning.

5.　　　 Kate and her friends were dancing all evening.

4.　　　 He was washing clothes all morning.

3.　　　 She was cooking while I came in

2.　　　 You were reviewing your lessons the last whole week.

1.　　　 They were studying English at this time yesterday.

9.　　　 come up with an idea

Exercises

句型转换。(1-5改为否定句和一般问句并回答，6-10 改为特殊问句。

8.　　　 peel the potatoes