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1、状语从句用法详解定义：在复合句中作状语的从句功能：状语从句在主从复合句中修饰主句中的动词，形容词或副词，或整个主句分类：按意义可分为时间、地点、原因、目的、结果、条件、方式、比较、让步等状语从句。从句的位置放在句首，也可放在句末。放在句首时，从句后面常用一个逗号，放在句末时，从句前一般不用逗号。一、时间状语从句when,while,as,before,after,since,until(till),once,assoonas,themoment,theminute,immediately,directly,each/eve
2、rytime,thefirsttime,thelasttime,nexttime,bythetime,whenever等。Every/EachtimeIwasintrouble,hewouldcometomyhelp.IthoughtherniceandhonestthefirsttimeImether.A.when,while,as的区别：1)when引导从句时，主从句的动作有先有后，也可以同时进行,从句的动作可以是持续性的，也可以是短暂的。如：WhenIgottotheairport,theplanehadalread
3、ytakenoff.WhenIlivedthere,IusedtogototheseasideonSundays.Whenthemovieended,thepeoplewentback.2)while侧重主句的动作发生在从句的时间之间，且从句的动词必须是持续性的。Whilewewerechatting,shewaslookingatthetimetableonthewall．3)as引导从句时侧重主从句动作同时或几乎同时进行，从句的动作可以是持续性的，也可以是短暂的。as表示一边……一边……，强调从句和主句中两个动作交替进
4、行或同步进行。as表示随着，此用法不用when或while替代。SometimesIwatchTVasIamhavingbreakfast．Helookedbehindfromtimetotimeashewent. Asspringwarmstheearth,alflowersbegintobloom.其它用法:1．when＊并列连词when常用与以下句型中,when只能跟在前一分句之后。①…was/weredoing…when(suddenly)…（正在做…突然）②…was/wereabouttodo…when…（刚要做
5、…突然）③…was/wereonthepointofdoing…when…(刚要做…突然)④…hadjustdone…when….(刚一…就)⑤Hardly/Scarcelyhad…done…when…(刚一…就) Hewasabouttogotobedwhenthedoorbellrang. TheywerewatchingtheWorldCupwhensuddenlythelightswentout. Theyhadjustarrivedhomewhenitbegantorain. HardlyhadIstoodupw
6、henhesaidhellotome.＊有时when表示虽然，尽管的含义，相当于although或since。Hewalkswhenhemighttakeataxi. Howcanyouhopeformercyyourselfwhenyoushownone .＊如果when引导的时间状语从句的主语与主句主语相同，而从句的谓语又是be动词时，那么从句中的主语和be可以省略；13When(youare)introuble,askherforhelp.＊当when引导的时间状语从句的主语与主句主语相同时，往往还可以用“when＋
7、分词”的形式替代该状语从句。WhenIcameintotheroom(=Whencomingintotheroom),Ifoundhimlyingthereasleep.2．while＊while有时可以作并列连词，表示对比，可译成……而……。IamfondofEnglishwhilehelikesmath. Wesleptwhilethecaptainkeptwatch. ＊while有时可引导让步状语从句，意思是虽然。Whiletheylovethechildren,theyarestrictwiththem. 1.I
8、hadjuststeppedoutofthebathroomandwasbusilydryingmyselfwithatowel____Iheardthesteps. A.whileB.whenC.sinceD.after2.—I’mgoingtothepostoffice. —____you’re
