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1、AdverbialClause状语从句的种类状语从句主要用来修饰主句或主句的谓语。一般可分为九大类,分别表示时间、地点、原因、目的、结果、条件、让步、比较、方式。时间状语从句关联词as/when/while;after;before;since;till/untilwhenever;nosooner…than/hardly…when副词immediately;名词短语themoment;theminute;thesecond;each(every)time;theday(year);nexttime;thefirst(second/last)time;bythetime条件状语从句if
2、;unless;as(so)longas;原因状语从句because;as;since;now(that)结果状语从句so(such)…that….目的状语从句sothat;inorderthat;让步状语从句though;although;as;however;nomatter….;疑问词+ever;比较状语从句than;as(so)….as;themore….themore地点状语从句wherewherever总结、状语从句常见引导词一、时间状语从句名词:after,as,before,once,since,till,nottill,assoonas,when,whenever,n
3、omatterwhen,while,aslongas,nosooner...than...,hardly/scarcely/barely...when副词:immediately,directly,instantly名词短语:themoment,theminute,theinstant,thesecond,everytime,etc介词短语:bythetime,etcwhen,while,as的区别:①三者均可表示“当……的时候”,如果主句表示的是短暂的动作,而从句表示的是一段时间,三者可通用。②as和when都可与终止性动词连用,while只能与延续性动词连用。如:Itwassnow
4、ing____wegottotheairport.当我们到达机场时,天正下着雪。(不能用while)③as强调主句与从句表示的动作同时发生;while强调主句表示的动作持续于while所指的整个时间内;when可指主、从句所述动作同时或先后发生。如:Hesangashewentalong.他边走边唱。Pleasewrite____Iread.我读的时候,请写下来。____hereachedhome,hehadalittlerest.回到家后,他休息了一会儿。hardly/scarcely/barely…when,nosooner…than表示“一……就”,放在句首需用倒装句Wehadh
5、ardlygot/Hardlyhadwegotintothecountrywhenitbegantorain.Nosoonerhadhearrived/Hehadnosoonerarrivedthanshestartedtill/until引导的时间状语从句从句位于句首时,只能用until强调句型中多用untilItwasnotuntilthemeetingwasoverthathemadeacalltohiswife.PleasewaituntilIfinishedthebook.二、条件状语从句由连接词if或unless引导的状语从句叫做条件状语从句。常用引导词:if,unless
6、if,unless特殊引导词:aslongas(除非;只要),ifonly(但愿......就好了),onlyif(只要),onconditionthat(条件是),incasethat(万一),provided/providingthat(假如),suppose/supposingthat(假如),onconditionthat(条件是),intheeventthat(倘若)E.g.Solongasyou'rehappy,itdoesn'tmatterwhatyoudo.Youmayborrowmybookaslongasyoukeepitclean.Takeyourumbrella
7、incaseitrains.非真实条件句是虚拟语气的一种的一种,表示与事实相反不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。 如:IfIwereyou,IwouldinvitehimIwouldhavearrivedmuchearlierifIhadnotbeencaughtinthetrafficIfIwereyou,Iwouldgowithhim.If引导词用法if引导的条件句有:真实条