While与when的区别.doc

while与when的区别连词while引导的时间状语从句表示“在……期间”,“在……过程中”通常从句中的谓语动词是延续性动词(非瞬间性动词)并常用进行时态。while指一段时间。如：Theirparentsjustwaitedoutsidetheschoolwhilethestudentswerehavingtheexams.当学生在考试时，他们的父母就在学校的外面等他们。连词when引导的时间状语从句表示“当…时候”,通常从句中的谓语动词可用短暂性动词。when指一点时间。如：Iwasstudyingwhenmyfriendsarrived.(arrive是一个瞬间性动词)MyfriendsarrivedwhileIwasstudying.when引导的时间状语从句放在主句的后面，可强调动作的突然性。如：Iwashavingbreakfastwhenthetelephonerang.我正在吃早饭，电话铃突然响了。when有时用来代替while，但while决不能用来代替when。也就是说when可以指一点时间，也可指一段时间；而while只可指一段时间，不可指一点时间。如：WhenwearrivedinBeijing,itwasearlyinthemorning.当我们到达北京的时候，还是清晨。When/whilewewereinBeijing,wemeteveryday.当我们在北京时，每天见面。Exercise用while与when填空1.Nevergetoffthebus______itismoving.2.Keepsilent______youarelisteningtotheteacher.3.IwashelpingmyclassmatewithhisEnglish_____theteachercamein.4.______wewerehavingaparty,thelightswentout.5.TheywerewatchingTV_____Mrs.Johnheardaknockonthedoor.6.Thecarbrokedown______Iwasgoingtotheairport.7.Whatwereyoudoing_____Icalledyouonthephone.8.Itbegantorain_____theboyswerewateringtheflowersinthegarden.9.Iwastakingawalk_____Imetwithanoldfriendofmine.10.Don’tmakeanynoise______youareinthereading-room.11.Iwasjustleavingtheschool______itrained.Keys:1.while2.while3.when4.While5.when6.while7.when8.while9.when10.when/while11.when适合九年级江苏省海安县白甸中学王爱中226682