资源描述：
《状语从句的课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、AdverbialClauses(1)Youdon’tknowmebecauseIamnobody.WhenIcameintotheclassroom,Ifeltnervous.Ifwetryourbest,wecanmakeit.____________________________________________________________原因状语从句时间状语从句条件状语从句1.AdverbialClausesofTime:（时间状语从句）when,while,as,before,after,since,until(till),assoonas2.Ad
2、verbialClausesofReason(原因状语从句）because,since,as3.AdverbialClausesofCondition(条件状语从句）if,unlessa.WhenIcamein,theyweretalkingloudly.b.Whilehewasaway,Lucylookedafterhisdog.c.Aswesatdown,Andycameintotheroom.d.Jimhadtopayforthebookbecausehelostite.Ididn’tknowituntilyoutoldme.f.Pleasecallmea
3、ssoonasyougetthere.g.Ifitrainstomorrow,theywillstayathome.h.Youwillnotpasstheexamunlessyouworkhard.i.Wemustclosethedoorbeforeweleave.j.I’velivedheresinceIwasborn.k.Sinceyouarehere,pleasehelpmecleantheroom.when,as，while的用法比较：when:（当…时）表示主、从句的动作或状态同时、之前、之后发生as（正当…时，边…边…）表示主、从句的动作或状态同时或
4、几乎同时发生while（在…期间，在…之时）所引导的从句中的动词或状态是延续性的When从句的动作在主句之前发生，只能用when，不能用as/while。When/As从句的动作是延续性的，主句却是短暂的，while,as,when都可用．While/As/When主从句的两个动作同时进行，且都是延续性，只能用whileWhile连接两个同时发生的短暂性动词，只能用when和as，不能用while.a.________hesatdown,hismothercamein.b.______herantothestop,thebushadgone.c.________
5、_____hewaswatchingTV,hismothercamein.d._________hewaswatchingTV,hismotherwascooking.since的用法：since表示从过去某一时间或动作、事情起到目前为止，“自….以来”。引导状语从句时，主句用现在完成时，从句中用一般过去时。e.g.自从他来到我们班以来,他的学习成绩提高了许多.Hisstudyhasimprovedalotsincehecametoourclass.2.常用句型：itis(hasbeen)…..+since+一般过去时e.g.自我开始学英语已有5年了.(我已学了
6、5年英语了.)ItisfiveyearssinceIbegantolearnEnglish.(IhavelearnedEnglishforfiveyears.)Exercise1Choosethebestanswers:()1.Iwaswalking___Iheardacryforhelp.A.whileB.whenC.assoonasD.until()2._____thedaywenton,theweathergotworse.A.BeforeB.AfterC.AsD.While()3.Icalledhim_____Igottohishometown.A.un
7、tilB.whileC.assoonasD.since()4.Hewaited______alltheotherpeopleleftthestation.A.afterB.sinceC.untilD.notuntil()5.Hefelloffthebike_____heknewwhathadhappened.A.assoonasB.beforeC.untilD.while()6.Pleaselookafteritforme_____Iamaway.A.whileB.untilC.asD.after()7.Whilehisfatherwassinging,he__
8、____thepiano
