高考中when的用法（2012西城一模）29．Whydosomerichpeoplestealthings____theycouldeasilyaffordtobuythem?A．unlessB．beforeC．ifD．when一、when用作从属连词，含义如下：1.既然......... 例如：Youmustadmititwhenyouhavemade amistake.2.一........就....... 例如：Wewillstandupwhenourteachercomesin.3.如果....... 例如：Callmeatoncewhenyouareill.4.当.........时候 例如：WhenIgottothestation,thetrainhadleft.5.然而；可是”，相当于although 例如：Shestoppedtrying,whenshemighthavesucceedednexttime.二、when作为对等连词，意为：“正在此时；正在这时”。常见句型如下：1.be doing somethingwhen................ Iwasdoingmyhomeworkwhenthetelephonerang.2.beabouttodosomethingwhen............ Hewasabouttoleaveherewhenthetelephonerang.3.beonthewayto...when................. Iwasonmywaytothelecturewhensomeoneaskedmefordirections.4.bebusydoingsomethingwhen............. Iwasbusywritingmycompositionwhenhecametovisitme.5.beonthepointofdoingsomethingwhen......... I wasonthepointofhavingarestwhenthetelephonerang.6.hadjustdonesomethingwhen............. Ihadjustfinishedmyhomeworkwhenitrainedheavily.7.hadnotdonesomethingwhen............... Ihadnotfinishedmyhomeworkwhen heaskedmetogooutforplay.三、when用作关系副词引导定语从句例如：Ihave neverforgettenthedaywhen(onwhich)Ijoinedthearmy.四、when可以用作连接副词，引导名词性从句。when在从句中既起连接作用同时也作状语Iremember______thisusedtobeaquietvillage. A.whenB.how C.whereD.what五、固定搭配1.Somebodyhate/love/enjoy/appreciate/likeitwhen..............例如：I likeitintheautumnwhenthewheatherisclearandbright.2.Hardly..........when.........(一.....就.....）例如：HardlyhadI gottoschoolwhenthebellrang.3.Whenitcomesto......... (当谈及.......）例如：Whenitcomestoeducation,alotofpeoplethinkitisalifelongstudy.六、when引导时间状语从句时，如果主从句主语一致或从句主语为it，且从句中的谓语部分含有be的形式，可将从句主语和be省略 When______,themuseumwillbeopentothepublicnextyear. A.completed B.completing C.beingcompleted D.tobecompleted实践操练1.Wewereswimminginthelake______suddenlythestormstarted. A.whenB.while C.untilD.before2.Don’tbeafraidofaskingforhelp______itisneeded. A.unlessB.since C.althoughD.when3.翻译：队长一来我们就出发。（用when)Wewillstartwhentheteamleadercomes.4. Hewasabouttotellmethesecret_______someonepattedhimontheshoulder. A.asB.until C.whileD.when5.Thefilmbroughthoursbacktome______Iwastakengoodcareofinthatfarawayvillage. A.untilB.that C.whenD.where 6. WhatIaskedhimis_______thestoryhappened. A.whenandwhat B.whichandwhere C.whatandwhere D.whenandwhere7.Whydoyouwantanewjob_______you’vegotsuchagoodonealready? A.thatB.where C.whichD.when(2007年北京高考)8.（25.）---Where’sthatreport?---Ibroughtittoyou____youwereinMr.Black’sofficeyesterday.A.ifB.whenC.becauseD.before9.翻译：李教授虽然有车可骑，但他还是步行去上班。（用when)ProfessorLiwalkstoworkwhenhemightride.要点
总结
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一、when用作从属连词，含义如下：1.既然......... 2.一........就....... 3.如果....... 4.当.........时候 5.然而；可是二、when作为对等连词，意为：“正在此时；正在这时”。三、when用作关系副词引导定语从句四、when可以用作连接副词，引导名词性从句。五、固定搭配1.Somebodyhate/love/enjoy/appreciate/likeitwhen..............2.Hardly..........when.........(一.....就.....）例如：3.Whenitcomesto......... (当谈及.......）六、when引导时间状语从句时，如果主从句主语一致或从句主语为it，且从句中的谓语部分含有be的形式，可将从句主语和be省略Thankyouforlistening!
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