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1、一.时间状语从句引导时间状语从句的连词有：when,as,while,until,not…until,before,after,since,theminute,themoment,each(every,next,thefirst)time等。时间状语从句中一般用一般现在时或一般过去时。1．when,while,as都可解释为“当```的时候”但侧重点有所不同。1)When后既可以接短暂性动词，也可以接延续性动词，表示从句动作与主句动作同时发生。WhenIarrivedhome,Ihadalittlerest.2）As除了表示“当```的时候”，还可表
2、示为“一面```一面”，“随着”Hesangashedanced.(一面```一面)Youwillgrowwiserasyougrowolder.(随着)3)While表示“当```的时候”强调主句的动作和从句的动作同时发生，从句一般用进行时，从句动词必须是延续性动词。Whilewewereworking,theywerehavingarest.While(theywere)havingadiscussion,theygotveryconfused.注意：while有对比的含义，解释为“然而”。eg:Ipreferblacktee,whileheli
3、kescoffee.2．until,not…until表示“直到`才”,在肯定句中主句常用延续性动词；在否定句中常用短暂性动词。6肯定句：Iwaiteduntilmidnight.否定句：Ididnotleaveuntilmidnight.注意点：1）notuntil…在句首，主句用倒装NotuntilyouhadexplainedhowdidImanagetodoit.2)Itisnotuntil…that…引导的强调句Itwasnotuntilitwasdarkthathecameback.3．Hardly/scarcely…when,nosoo
4、ner…than,assoonas表示为“一```就```”Ihadhardly/scarcelygothomewhenitbegantorain.Ihadnosoonergothomethanitbegantorain.ItbegantorainassoonasIgothome.二.条件状语从句条件状语从句分为两大类：真实条件句（主将从现）和虚拟条件句（虚拟语气）。引导条件状语从句的连词有：if,evenif/though,unless/if…not,aslongas/solongas,asfaras/sofaras,provided/provid
5、ing(that),onconditionthat等。条件状语从句中如果主句是将来时，条件状语从句用一般现在时。1.unless和if…notunless相当于if…notYouwillfailunlessyoustudyhard.Youwillnotfailifyoustudyhard.6注意点：在虚拟条件句中可用if…not，但不能用unlessIfshewerenottoosilly,shewouldunderstand.2．引导条件状语从句的其它连词：Youmaygothere,aslongasyoukeepquite.Iwillgoprov
6、idedthatyougotoo.Ishallgiveyouthebookonconditionthatyoureturnittomorrow.三.让步状语从句引导让步状语从句的连词有：though,although,evenif/though,however,nomatterhow,nomatterwhat,nomatterwho等。1．though,although不可与but连用，但可以和yet,still连用.Though/Althoughitisraining,theyarestillrunningoutside.2.“nomatter+疑
7、问词”或“疑问词+后缀ever”Nomatterwhathappened,hewouldnotmind.Whateverhappened,hewouldnotmind.注意点：nomatter+疑问词不能引导名词性从句63.evenif/though表示“即使”Hedoesn’twanttomarryherevenif/thoughhelovesherverymuch.四.原因状语从句引导原因状语从句的连词有：because,since,as,nowthat,consideringthat,forthereasonthat,duetothefactt
8、hat,owingtothefactthat等。1．becausebecause语气最强，通常用于回答why
