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1、状语从句种类连接词注意点时间状语when,whenever,while,as(随着)(与with的区别)before,longbefore,beforelongafter,until,till,not…untilbythetime,sinceassoonas,hardly/scarely/barely…when,nosooner…than,（倒装，过去完成时）themoment,theminute,thesecond,theinstant,thewhile,immediately,directly,instan
2、tly,eachtime,everytime,the+序数词+time,theyear,theday,主句表示将来时，从句须用一般现在时（主将从现）；while引导的从句中动词一般是延续性的；until用在肯定句中主句动词是延续性的，而否定句中主句动词为短暂性的。Before过多久……才Itisthreeyearssincehejoinedthearmy.It’sthreeyearssincehewasasoldier.It’stenyearssincehesmoked地点状语where,wherever/an
3、ywhere/everywhereWherethereisawill,thereisaway.Whereveryougo,Igotoo.与定语从句的区分原因状语because,as,since,nowthat，inthat,for(连词)；becauseof,thanksto,owingto,dueto,onaccountof,asaresultof（介词短语）because语气最强，since较弱，表示大家都明了的原因，as又次之,for不位于句首。条件状语if,unless,once,incase（that
4、）,aslongas,onconditionthat,providing(that);povided(that);supposing(that);虚拟条件句（虚拟语气）主将从现；虚拟语气的用法（If从句时态退一格）；目的状语sothat,inorderthat,forfearthat（唯恐）to;soasto;inoderto(短语)sothat和inorderthat后常接may,should,could,would等情态动词结果状语so…that,such…thatSo/how/as/that+adj.+a
5、/an+N.Such/whata/an+adj.+N.比较状语than,as…as,notso/as…as,themore…themore方式状语asif,asthough,asasif和asthough引导的从句一般用虚拟语气。让步状语though,although,as;evenif,eventhough,nomatterwhat,whatever,nomatterwho,whoever,nomatterwhich,whichever,nomatterhow,however,nomatterwhen,whe
6、neveras在让步状语从句中常用倒装形式；although和though用正常语序，可和yet连用，但不可和but连用;nomatter+特殊疑问词&特殊疑问词+ever的区分状语从句中的主谓省略遵循下面原则：（1）当状语从句的主语与主句的主语一致时且从句中含有BE动词的某种形式时，可以省略状语从句的主语和系动词be，这时从句中可出现如下结构：如：Workhardwhen(youare)young,oryou'llregret.趁年轻要努力学习，要不然你会后悔如：Helookedeverywhereasi
7、f(hewas)insearchofsomething.他到处看似乎在找什么东西。如：Theexhibitionismoreinterestingthan(itwas)expected.这次展览比被预料的有趣的多如：OlympicgoldmedallisthurdlerLiuXiangopenedhislipsasif(hewere)tospeak.奥林匹克金牌获得者跨栏运动员刘翔张开嘴好象要说什么。（2）当从句的主语与主句的主语不一致，但从句主语是it，从句中又含有系动词be的某种形式时，可以把it和系动
8、词be一起省略。Unless(itis)necessary,you'dbetternotrefertothedictionary.如果没有必要，你最好不要查字典。Whenever(itis)possible,youshouldcomeandhelp.不管什么时候只要有可能就来帮忙。Youshouldletusknowtheresultassoonas(itis)possible
