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终止性动词
2.They arrived when we were having dinner.时间段
延续性动词
3.They arrived while we were having dinner. 时间段
延续性动词
4.We were talking when the teacher came in.
主句：过去进行时 从句：一般过去时
5.While we were talking, the teacher came in.
从句：过去进行时 主句：一般过去时
6.They were singing while we were dancing.
8. While she ______ TV, she ______ a sound outside the room.
A. was watching, was hearing B. watched, was hearing
C. watched, heard D. was watching, heard
9. What book ____ you ______ when I ____ you at four yesterday afternoon?
A. did, read, was seeing B. did, read, saw
C. were, reading, saw D. were, reading, was seeing
10. Lei Feng _____ always _____ of others when he ______ in the army.
A.is, thinking, was B. was, thinking, is
C. did, think, is D. was, thinking, was
11. While mother _______ some washing, I _____ a kite for Kate
A. did, made B. was doing, made
C. was doing, was making D. did, was making
1.While we were waiting for the bus, a girl ran up to us.
=______ we were waiting for the bus, a girl ran up to us.
2. ______ it _________(rain) when you left school?
3. What _____ your father _____ (do) when he was your age?
4. One day, Edison __________ (wait) for a train to arrive, and suddenly a little boy ran to the track(轨道) to play.
5. They ________________(not make) a model ship when I saw him.
6. While I _____________ (telephone) a friend，Bob ______ (come) in.
7. I ______ a meal when you _____ me.