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1、while和when引导的时间状语从句,主句用（一般过去时）从句用（过去进行）.while引导的从句要加延续性动词，而when 延续和短暂性动词都可以，。6. 另外，when和while的区别还在于：while引导的时间状语从句多用过去进行时态，而when引导的时间状语从句多用一般过去时态。While they were talking , the bell rang.正在他们谈话的时候，上课铃响了。I was doing my homework when my mother came back home yesterday evening.昨天晚上妈妈回家的时候，我正在做家庭作业。I am
2、cooking while Jane is practicing.我在做饭的时候简正在练习。当此句改变主从句的位置时，则用when引导。When the teacher came in，we were talkingThey were sweeping the floor when the teacher came in.老师进来时（这一时刻），他们在擦地板。While they were sweeping the floor，the teacher came in.他们正擦地板时（这段时间），老师进来了。2. when 说明从句的动作和主句的动作可以是同时，也可以是先后发生；while 则强
3、调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。例如：They were singing while we were dancing.He fell asleep when he was reading. 他看书时睡着了。1. While we_(wait)for the bus,a girl_(run)up to us.2.I_(telephone)a friend when Bob_(come)in.6.While mother_(put)Cathy to bed,the door bell_(ring).7.when I_(walk)in the park,it_(begi
4、n) to rain.9.George_(read)when they_(hear)a knock at the door.1.I_(have)my breakfast t at half past six yesterday morning.3.What_you_(do)at that time? We_(watch)TV.6._they_(have)a meeting at 4 yesterday afternoon?No,they_.They_(clean)the classroom.13.When the bell rang,jenny_(wait )in her seat.14.Sh
5、e_(make)her dress the whole afternoon.1 .I _ a meal when you _ me.a. cooked, were ringing b. was cooking, rangc. was cooking, were ringing d. cooked, rang2.He said he _ to draw a plane on the blackboard at that time.a. tries b. tried c. was trying d. will try3.While she _ TV, she _ a sound outside t
6、he room.a. was watching, was hearing b. watched, was hearingc. watched, heard d. was watching, heard4.They _ a football game from 7 to 9 last night.a. were watching b. watch c. watched d. are watching 10.He _ his father on the farm the whole afternoon last Saturday.a. helps b. would help c. was help
7、ing d. is helping11.While mother _ some washing, I _ a kite for Kate.a. did, made b. was doing, made c. was doing, was making d. did, was making13.He _ some cooking at that time, so he _ mea. did, heard b. did, didnt hear c. was doing, heard d. was doing, didnt hear14.This time yesterday jack _ his bike. He _ TVa. repaired, didnt watch b. was repairing, watchedc. repaired, watched d. was repairing, wasnt watching