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1、时间状语从句AdverbialClause时间状语从句时间状语从句的引导词when,while,as,before,after,since,until,till,assoonas,once,hardly…when,nosooner…than,whenever等when的用法小结1.可用作并列连词，其意义为“这时,突然”，相当于andthensuddenly。常用于下列句式：bedoingbeabouttodosthbeonthepointofdoingIwasabouttogooutwhenthedoorbellrang.OneeveningIwashaving
2、mydinnerwhenanunexpectedfriendknockedmydoor.+when2.还可以表示原因“既然”，相当于since;consideringthat。如：Itwasfoolishofyoutotakeataxiwhenyoucouldeasilywalkthereinfiveminutes.Howcanhegetgoodgradeswhenhewon'tstudy?3.When的省略句型:当when引导的从句与主句主语一致,且从句中包含be动词时,可省略从句主语和be动词。Ihavetriedtokeepthisadviceinmind
3、when(Iam)writingthebook.Hegavegoodpracticaladvicewhen(hewas)asked.WhenatRome,doastheRomansdo.Whenstillayouthhewitnessedtherisingdissatisfactionofthemasses.Wewilldothatonlywhen(itis)necessary.whileIliketeawhileshelikescoffee.Whiletheyaremyneighbors,Idon’tknowthemwell.Whilethereislife,
4、thereishope.然而(对比)尽管(句首)只要asAsyouweren'tthereIleftamessage.YoungasIam,IalreadyknowwhatcareerIwanttofollow.DoasIsayandsitdown.Asachild,hewashopelessatmaths.因为(句首)尽管(倒装)以...方式当...的时候(省略结构,常保留名词)till,until和not…until1.until/till引导时间状语从句用于肯定句时，主句的动词是延续性动词,表示动作或状态一直持续到until/till所表示的时间,意为“某
5、动作一直延续到某时间点才停止”。如：Wewaiteduntilhecame.直到他来,我才买了这本书。2．用于否定句时，主句谓语动词是非延续性动词，从句为肯定，意为“某动作直到某时间才开始”。如：Ididn’tbuythisbookuntilhecame.3．till不可以置于句首，而until可以。如：UntilyoutoldmeIhadnoideaofit.4．not…until句型中的倒装和强调说法：NotuntilhecamedidIbuythisbook.ItwasnotuntilhecamethatIboughtthisbook.before一、含义
6、1．Wehadsailedfourdaysandfournightsbeforewesawland.2．Wehadn’trunamilebeforehefelttired.3．BeforeIcouldgetinaword,hehadmeasuredme.才…就…不等…就…二．Before从句中谓语不用否定式。如：Beforetheyreachedthestation,thetrainhadgone.三．1）句型Itwillbe/was＋段时间＋before…“还要过多久才……”如：Itwillbetwoyearsbeforeheleavesthecountry.
7、2）句型Itwillbe/wasnot＋一段时间＋before…“不多久就……”如：Itwasn’ttwoyearsbeforeheleftthecountry.Since1.since表“自从”，所引从句使用非延续性动词，主句使用完成时态。Sincehegraduatedfromthecollege,hehasworkedinthiscity.若since所引从句使用延续性动词或状态动词的过去式，则表示动作或状态的完成或结束。SincehelivedinNanjing,Ihavenotheardfromhim.Sincehewasastudent,hehasn
8、evercomeback
