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1、第十二讲状语从句（含练习与答案）担任状语的从句叫状语从句，可以用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步等。一、时间状语从句：引导词有after，before，as，once，since，till，until，when，whenever，while，assoonas，themoment/minute…（一…就），thetime,theday,everytime,nexttime,eachtime，bythetime，nosooner…than（一…就），hardly(scarcely)…when（一…就）immediately/direct
2、ly等．Each/Everytimehecomeshere,hewilldropinonme.HewasilllasttimeIsawhim.上次我见到他时他病了．HardlyhadIgottotheofficewhenmywifephonedmetogobackhomeatonce.=NosoonerhadIgottotheofficethanmywifephonedmetogohomeatonce.IrecognizedhimimmediatelyIsawhim.※when,while与as当主句动作时瞬时的，从句动作是延续的，三者都可以用。when引导
3、的从句动词可以是延续性的或短暂性的，在“be…when…”句式中when表“atthattime(就在这时)”意。while引导的从句中动词必须是延续性的；有时并不表示时间，而表示对比，意“而”、“却”，并列连词，表对照。As强调主、从句动作同时或几乎同时发生，意为“一边…一边…”。WhenIgothomeIfoundthedoorlocked.While/When/aswewereworkinginthefields,itsuddenlybegantorain.Hewaswanderingthroughthestreetswhenabikehithim.I
4、wasabouttogooutwhenthetelephonerang.Ihadjustarrivedatschoolwhenmywifephonedmetogohome.Hispencilisred,whilemineisyellow.Johnsanghappilyashewentalong.※till与until一般情况下可以互换，但until可以位于句首，till则不能。Untilitstopsraining，thechildrencan’tgoout.＝Notuntiltherainstopscanthechildrengoout.二、地点状语从句引
5、导词有where，wherever.I’llgowhereverthepeoplewantmetogo.(wherever＝toanyplacewhere)Heworkswherehisgrandfatherfought.(where＝intheplacewhere)Wherethereisawill,thereisaway.(Where＝Intheplacewhere)11三、原因状语从句引导词有because,since,as,now(that)(既然)回答以why提出的问题时，只能用because。since＝now(that),表“既然”意，表示已知
6、的或明显的原因。Nowthat/Sinceyouarefreetoday,youmayhavearestathomeorgooutforawalk.for是一个并列连词，用来连接两个并列句，引导的句子是对前面一句话的内容的推测或补充说明。Itmusthaverainedlastnight,forthegroundiswet.Thedayhasbroken,forthebirdsaresinging.(这两句中的for不可替换)四、目的状语引导词有sothat,inorderthat,that,incase（免得，以防）。目的状语从句的谓语常含有can/cou
7、ld/may/might/will/would等情态动词。Heranasfastaspossibleinorderthathecouldcatchthebus.PleaseremindmeofitagaintomorrowincaseIforget.五、方式（或比较）状语从句引导词有as,asif,asthough,theway,than,as/so…as,themore…themore.Itlooksasifitisgoingtorain.Myteachertreatsusasifshewereourmother.Sometimesweteachourch
8、ildrenthewayourparentshave
