while和when引导的时间状语从句主句用一般时

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 homeworkwhen my mother came back homeyesterday eve ning.昨天晚上妈妈回家的时候，我正在做家庭作业。I

2、am 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 floorwhen 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. whe n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；wh

3、ile则强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 singingwhile we were dancing.他看书时睡着了He fell asleep whe n he was read ing.1. While we(wait)for the bus,a girl(run)up tous.2.I(teleph on e)afrie ndwhe nBob(come)i n.6.Whilemother(put)Cathytobed,thedoorbell(rin g).7.whe n 1(walk)in the park,it(beg in) to

4、 rai n.9.George(read)whe n they(hear)a knock at the door.1.1(have)my breakfast t at half past six yesterday morni ng.3.Whatyou(do)at that time? We(watch)TV.6.they(have)ameeti ngat 4 yesterdayafternoon?No,they.They(clea n) the classroom.13.Whe n the bell rang,jenny(wait )in her seat.14.She(make)her d

5、ress the whole after noon.1 .I a meal when you me.a. cooked, were ringingb. 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. triedc. was tryingd. will try3. While she TV, she a sound outside the room.a. was watching,

6、 was hearing b. watched, was hearingc. watched, heardd. was watching, heard4. They a football game from 7 to 9 last night.a. were watching b. watchc. watchedd. are watching10.He his father on the farm the whole afternoon last Saturday.a. helps b. would help c. was helpingd. is helping11.While mother some washing, I a kite for Kate.a. did, madeb. was doing, made c. was doing, wasmakingd. did, was makinga. did, heard b. did, didnt hear c. was doing, heard d. wasdoing, didnt hear14.This time yesterday jack his bike. He