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状语从句状语从句时间状语从句地点状语从句原因状语从句目的状语从句结果状语从句条件状语从句方式状语从句让步状语从句比较状语从句1.时间状语从句1)由连词when,while,as,assoonas,before,after,since,till/until等引导。•主句用将来时，从句常用一般现在时表将来Iwilltellhimwhenhecomesback.2)while,when,as辨析While引导的时间状语从句只指一段时间，强调某一段时间内，主从句动作同时发生。从句动词常是延续性的When既可以指一个时间点,也可以是一段时间，可表示主从句的动作同时或先后发生。从句动词可以是延续性的，也可以是非延续性的。As强调主句﹑从句动作相并发生,译为”一边…一边…”Whenhereturned,hiswifewascooking.Whilehewasreading,hiswifewascooking.Hehurriedhome,lookingbehindashewent.另外,when/while还作并列连词,连接并列分句,while表示“而,可是”如:IlikereadingwhilemywifeenjoyswatchingTV.when表示“就在这时”在下列结构中，表示某件事正在发生或刚刚发生，另一动作同时发生。1.beabouttodo…when…2.bedoing…when…3.haddone…when…e.g.Wewereabouttostartwhenitbegantorain.Iwasplayingcomputergameswhenmomcamein.3)until/till(不用于句首)“延续的动词（肯定式）+until”表示“直到…为止”Iwaitedforhimuntilhecameback.“非延续性动词（否定式）+until”表示“直到┅才”Hedidn’tgotobeduntilhefinishedhiswork.Notuntilhesawithimselfdidhebelieveit.注意:notuntil在句首时要倒装4)表示“一…就…”的句型(1)assoonas,once,themoment/minute/second,immediately/directly/instantlyAssoonashecomes,I’lltellhim.ThemomentIsawhim,Irecognizedhim.Ileftimmediatelytheclockstruck5.(2)on/upondoing/on(upon)one’s+nOnarrivingatthestation,thethiefwasarrested.OnhisarrivalinParis,hewasrecognizedasafamousperson.5)Everytime,eachtime等也可以引导时间状语从句EverytimeIcaughtacold,Ihadpaininmyhead.(3)nosooner…than/hardly…when/scarcely…whenNosoonerhadtheyreachedhomethanitstartedtorain.HardlyhadIenteredtheroomwhenthetelephonerang.Ihadthreetriesandfailedeachtime.6)before和since1）before“还未…就…”,“不到…就…”，“…才…”Wehadn’trunamilebeforetired.Doitnowbeforeyouforget.2）Itwillbe+时间段+beforesb.do多久之后才…ItwillbetwoyearsbeforeIcomeback.2.让步状语从句引导词有：although,though,evenif/though,as,while（尽管）whether…or…(无论…还是…),whoever=nomatterwhowhenever=nomatterwhenwhatever=nomatterwhatwherever=nomatterwherehowever=nomatterhow1)as引导的让步从句要倒装，句型为：形容词/副词/名词（不带冠词）/动词（原形）+主语+谓语Youngasheis,heknowsalot.MuchasIlikeit,Ican’taffordit.Farmerasheis,heiswell-educated.TryasImight,Icouldn’tliftthestone.2）although不倒装，though可倒装也可不倒装,as必须倒装Although/Thoughhewasillhedidn’tstopworking.3）nomatter+疑问句引导让步状语从句Nomatterwhathappened,heshouldn’tmind.=Whateverhappened,heshouldn’tmind.Nomatterwhoyouare,youshouldobeythesocialrules.=Whoeveryouare,youshould…4)whether…orWhetheryoubelieveitornot,itistrue.3.地点状语从句引导词有:where,wherever注意：不要混同于where引导的定语从句与定语从句的区别：where引导定语从句，从句前有一个表示地点的名词。Gobackwhereyoucamefrom.Gobacktothevillagewhereyoucamefrom.(有志者，事竟成）I’llfollowyouwhereveryougo.Wherethereisawill,thereisaway.4.原因状语从句由because,since,nowthat,as引导。(1).because语气最强，用来回答why提问，可用在强调句型中。Itwasbecausehewasillthathedidn’tgowithus.(2).Since语气比because弱，表示关系上的自然结果，一般译成“既然，鉴于”（往往放于主句之前）Sincenooneisagainstit,let’scarryouttheplan.（既然没人反对,…)(3).as语气最弱，只说明一般的因果关系（可放于主句之前，也可放于主句之后）Wearstrongshoesasweshalldoalotofwalkingtoday.(4).for也可以表示原因，不是说明直接原因，而是对某种情况加以推倒，用于表示补充说明理由。Hemustbeill,forheisabsenttoday.(5).nowthat用来说明一种新情况，然后加以推理，nowthat放于句首时，that可省略。Now(that)everybodyishere,let’sbegin.5.目的状语从句引导词：inorderthat,sothat(为了）,forfearthat,incase,谓语动词常含有can,could,may,might,will,would等情态动词。I’llspeakslowlysothateverybodycanunderstandme.Hewrotethenamedownforfearthat(incase)hewouldforget.6.结果状语从句：引导词有：so…that,such…that,sothat常用句型：1)so+adj.(adv.)+that2)so+adj.+a(an)+n.+that3)Such+a(an)+adj.+n.+that4)Such+adj.+n(s)+thatHespokesofastthatIcouldn’tfollowhim.Itwassuchagooddaythatweallwentswimming.7.条件状语从句1.由if,unless(=ifnot),so/aslongas(只要),suppose/supposing(假设，如果),incase(以防),onconditionthat,providedthat(如果)引导。e.g.Youmayusetheroomaslongasyoucleanitupafterwards.2.“祈使句+and/or/orelse/otherwise”引导的结果句，祈使句在实际意义上相当于条件状语从句。Useyouhead,andyouwillfindaway.Getupnow,oryouwillbelate.8.方式状语从句引导词有:as(如同),asif/though(好像)Theyaretalkingasif(asthough)theywereoldfriends.注意：as，like都表示“像”，Iworkasothersdo.Iworklikeothers.as是连词，后加句子like是介词，后加名词、代词、名词短语9.比较状语从句由as…as,notas/so…as,than,themore…themoreHeranasfarashecould.Theharderyoutry,thebetteryouwillunderstand.