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状语从句一、考点聚焦二、精典例题一、考点聚焦•1、时间状语从句：as,when,while•as表示“当……的时候”，往往和when/while通用，但它着重强调主句与从句的动作或事情同时或几乎同时发生。•ShecameupasIwascooking.(同时)•Therunnersstartedasthegunwentoff.(几乎同时)when•既可以表示在某一点的时候，又可表示在某一段时间内，主句与从句的动作或事情可以同时发生也可以先后发生。•Itwasrainingwhenwearrived.(指时间点)•Whenwewereatschool,wewenttothelibraryeveryday.(在一段时间内)while•while意思是“当……的时候”或“在某一段时间里”,从句中的动词一般要用延续性动词。在when表示“一段时间”时，两者可以互换。•Pleasedon’ttalksoloudwhileothersareworking.•Hefellasleepwhile/whenreading.•Strikewhiletheironishot.(用as或when不可，这里的while意思是“趁……”)（2）引导时间状语从句的连接词除上述外还有：•①till,not…until…,until,before,since•Don’tgetoffthebusuntilithasstopped.•Hewaitedforhisfatheruntil/tillitwastwelveo’clock.•ItwillbefiveyearsbeforehereturnsfromEngland.•②hardly/scarcely…when,nosooner…than,assoonasonce表示“一……就”•AssoonasIhavefinishedit,I’llgiveyouacall.•Onceyoushowanyfear,hewillattackyou.•Wehadhardlygot/Hardlyhadwegotintothecountrywhenitbegantorain.•Nosoonerhadhearrived/Hehadnosoonerarrivedthanshestartedcomplaining.③directly,immediately,themoment,theminutethat…一……就•Hemadeforthedoordirectlyheheardtheknock.•④eachtime,everytime,bythetime•Eachtimehecametomycity,hewouldcallonme.•Bythetimehecomestomycity,hewillcallonme.•注意：表示未来情况，主句用将来时，从句用现在时。2、让步状语从句•（1）although与though可以引导让步状语从句，不能与but连用，但可以与yet连用。•Althoughtheyarepoor(yet)theyarewarm-hearted.•（2）evenif或eventhough引导让步状语从句，表示“即使”，“纵然”，用来使人注意下文所强调内容的性质。•I’llgetthereevenif(though)Ihavetosellmyhousetogetenoughmoneytogobyair.•（3）nomatter后接上who,what,where,how等疑问词，也可以在这类疑问词后面加上ever构成whoever,whatever,wherever,however等。•Don’ttrusthim,nomatterwhat/whateverhesays.•Whoeverbreaksthelawwillbepublished.•Nomatterhowhardtheworkis,you’dbettertrytodoitwell.（4）as也可以引导让步状语从句。要用倒装。•Childas(though)heis,heknowsalot.•MuchasIlikeit,Iwon’tbuy.•Tryashewould,hecouldn’tlifttheheavybox.3、原因状语从句：because,for,as,since,nowthat•（1）表示不知道的原因时用because,即说话人认为听话人不知道，因此because从句是全句最重要的部分，通常它被置于主句之后。•YouwanttoknowwhyI’mleaving?I’mleavingbecauseI’mfull.•for语气较because要弱得多，它只能置于主句之后，这时，for是并列连词。如果不是因果关系，而是对前面主句的内容加以解释或推断时，只能用for.•It’smorningnow,forthebirdsaresinging.•（2）表示已经知道的原因时用as或since,即某种原因在说话人看来已经很明显，或已为听话人所熟悉，since要比as正式一些，它们通常被置于主句之前，但有时却相反。•Seeingallofthechildrenalreadyseated,hesaid,“Sinceeveryoneishere,let’sstart.”•(3)下列情况下只能使用because:•①在回答why的问句时；•②在用于强调句型时；•③被not所否定时。•ThereasonwhyIamhappyisnotbecauseIamwealthy.•4、地点状语从句：where,wherever•Makeamarkwhereveryouhaveanyquestions.•WewillgowherethePartydirectsus.•5、目的状语从句：that,sothat,inorderthat•注意：目的状语从句的谓语动词常与情态动词连用，否则可能是结果状语从句。不可置于句首。•IgotupearlysothatIcouldcatchthefirsttrain.•6、结果状语从句：that,sothat,so…that,such…that…•IwassotiredthatIfellasleepthemomentIlayonthebed.•注意：so+形容词/副词+that从句；such+名词+that从句。•7、方式状语从句：as,asif(though)•I’lldoasIamtoldto.•Itlooksasifitisgoingtorain.8、比较状语从句：than,as•YaoMingismuchtallerthanPanChangjiang.•Mybedroomisaslargeasyours.9、条件状语从句：if,unless,so(as)longas,incase,once,asfaras,onconditionthat.•注意if与unless的区别：不能用and连接两个unless从句，即不能有…unless…andunless…。但if…notandif…not却不受此限。•Youwon’tloseyourweightunlessyoueatlessandunlessyouexercisemore.(×)•但可以说…unlessyoueatlessandexercisemore.10、注意状语从句中从句的省略现象•（1）连接词+过去分词•Don’tspeakuntilspokento.•Pressurecanbeincreasedwhenneeded.•Unlessrepaired,thewashingmachineisnouse.•（2）连词+现在分词•Lookoutwhilecrossingthestreet.•（3）连词+形容词/其他•常见的有itnecessary、ifpossible、whennecessary、ifany等。二、精典例题•1.Idon’tthinkI’llneedanymoneybutI’llbringsome____________.•A.aslastB.incase•C.onceagainD.intime•2.TheWTOcan’tliveuptoitsname_________itdoesn’tincludeacountrythatishometoonefifthofmankind.•A.aslongasB.while•C.ifD.eventhough二、精典例题•3、Someonecalledmeupinthemiddleofthenight,buttheyhungup_________Icouldanswerthephone.•A.asB.sinceC.beforeD.until•4.Youshouldtrytogetagoodnight’ssleepmuchworkyouhavetodo.•A.howeverB.nomatter•C.althoughD.whatever二、精典例题•5.HespeaksEnglishwellindeed,butofcoursenotanativespeaker.•A.asfluentasB.morefluentthan•C.sofluentlyasD.muchfluentlythan