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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。Whiletheyweretalking,thebellrang.正在他们谈话的时候，上课铃响了。Iwasdoingmyhomeworkwhenmymothercamebackhomeyesterdayevening.昨天晚上妈妈回家的时候，我正在做家庭作业。IamcookingwhileJaneispracticing.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。Whentheteachercamein，weweretalkingTheyweresweepingthefloorwhentheteachercamein.老师进来时（这一时刻），他们在擦地板。Whiletheyweresweepingthefloor，theteachercamein.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：Theyweresingingwhileweweredancing.Hefellasleepwhenhewasreading.他看书时睡着了。1.Whilewe____(wait)forthebus,agirl__________(run)uptous.2.I__________(telephone)afriendwhenBob__________(come)in.6.Whilemother______(put)Cathytobed,thedoorbell_______(ring).7.whenI________(walk)inthepark,it__________(begin)torain.9.George____(read)whenthey______(hear)aknockatthedoor.1.I_____(have)mybreakfasttathalfpastsixyesterdaymorning.3.What_____you___(do)atthattime?We_____(watch)TV.6.____they___(have)ameetingat4yesterdayafternoon?No,they_____.They_____(clean)theclassroom.13.Whenthebellrang,jenny_____(wait)inherseat.14.She_____(make)herdressthewholeafternoon.1.I______amealwhenyou_____me.a.cooked,wereringingb.wascooking,rangc.wascooking,wereringingd.cooked,rang2.Hesaidhe_____todrawaplaneontheblackboardatthattime.a.triesb.triedc.wastryingd.willtry3.Whileshe______TV,she______asoundoutsidetheroom.a.waswatching,washearingb.watched,washearingc.watched,heardd.waswatching,heard4.They_____afootballgamefrom7to9lastnight.a.werewatchingb.watchc.watchedd.arewatching10.He____hisfatheronthefarmthewholeafternoonlastSaturday.a.helpsb.wouldhelpc.washelpingd.ishelping11.Whilemother_______somewashing,I_____akiteforKate.a.did,madeb.wasdoing,madec.wasdoing,wasmakingd.did,wasmaking13.He____somecookingatthattime,sohe_____mea.did,heardb.did,didn'thearc.wasdoing,heardd.wasdoing,didn'thear14.Thistimeyesterdayjack_____hisbike.He_____TVa.repaired,didn'twatchb.wasrepairing,watchedc.repaired,watchedd.wasrepairing,wasn'twatching