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表语从句是在复合句中作表语的名词性从句,放在系动词之后,一般结构是“主语+系动词+表语从句”。可以接表语从句的系动词有be,look,remain,seem等。另外,常用的还有thereasonwhy…isthat…和Itisbecause…等结构。二、PredicativeClauses表语从句连接词:that/whether/asif/asthough(if不引导表语从句)连接代词:who/whom/whose/which/what连接副词:when/where/why/how/becauseThequestioniswhetherwecanrelyonhim.That’sbecausewewereinneedofmoneyatthattime.Helookedasifhewasgoingtocry.That’swhyIwaslate.注意：1.在表语从句中,表“是否”时,只能用“whether”不能用“if”。2.一般情况下，“that”不能省。3.Itis/wasbecause….Itis/waswhy….4.Thereason(why…/for…)is/wasthat….5.Thereasonisbecause/why…that….6.表语从句的引导词与宾语从句相同.但:1)that引导表语从句时不能省.2)if不能引导表语从句.1.That’s____thePartycalledonustodo.A.whyB.whatC.howD.that2.Thereasonis____heisunabletooperatethemachine.A.becauseB.whyC.thatD.Whether3.Thatis____theyseparated.A.thatB.whatC.whichD.where4.Janeisnolonger____shewasfouryearsago.A.whatB.whichC.thatD.whenBCDAExercise1)Thathewillsucceediscertain.2)Whetherhewillgothereisnotknown.3)Whathesaidisnottrue.4)Wherehehidthemoneyistobefoundout.5)Whoevercomesiswelcome.6)It’scertainthathewillsucceed.7)Howwecanhelpthetwinswillbediscussedatthemeeting.8)Whenthey’llstarttheprojecthasnotbeendecidedyet.三、SubjectClause主语从句考点一:主语从句后置!为了避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语.Thatweshallbelateiscertain.--It’scertainthatweshallbelate.1.Thattheearthisroundisknowntoall.--2.Thatyoumissedthechanceisapity.--Itisapitythatyoumissedthechance.It’sknowntoallthattheearthisround.It做形式主语的常见句型It’spossible/important/necessary/clearthat……很可能/重要的是…/必要的是…/很清楚…It’ssaid/reportedthat...据说/据报道…Ithasbeenannounced/declaredthat...已经通知/宣布…Itseems/appears/happensthat…似乎/显然/碰巧…It’snowonderthat…无疑…It’sapity/afact/acommonknowledge/acommonsayingthat…遗憾的是/事实是/众所周知/俗话说考点二主语从句中,谓语动词一般用单数，如：1)Thathewillsucceediscertain.2)Whetherhewillgothereisnotknown.3)Whathesaidisnottrue.4)Wherehehidthemoneyistobefoundout.5)Whoevercomesiswelcome.但是：what引导的主语从句需根据表语决定。Whatheneedsisthatbook.Whatheneedsaresomebooks.what引导主语从句时在从句中充当句子成分,如主语,宾语,表语,而that在句子中只起连接作用。例如：1)Whatyousaidyesterdayisright.2)Thatsheisstillaliveistrue.考点三what与that引导主语从句的区别练一练：1.______________________isknowntoall.(地球是圆的)2._________________________isapity.(你错过了这次机会)that无意义,后接一个完整的句子。that不可省。ThattheearthisroundThatyoumissedthechance注意：1.表“是否”时，if不能引导主语从句,应由whether引导。2.主语从句的“that”一般不能省。Mr.Liu,ourmathsteacher,isacharminggentleman.Thethoughtthattheycouldcrossthewholecontinentwasexciting.同位语（apposition）同位语从句（appositiveclause）四、AppositiveClause同位语从句1.SomepeoplehavetheideathatyoucancrossCanadainlessthanfivedays,buttheyforgetthefactthatCanadais5,500kilometersfromcoasttocoast.2.ThegirlsweresurprisedatthefactthatoceanshipscansailuptheGreatLakes.MoreexamplesSummary:1.同位语从句一般跟在某些名词（如fact,idea,news,promise,belief等）的后面。2.同位语从句用以说明或解释前面的名词。3.引导同位语从句的连词常用that。1)Thenewsthatyouheardisnottrue.Thenewsthatourteamhaswonistrue.2)Thefactthatwetalkedaboutatthemeetingisveryimportant.Thefactthatwesucceededpleasedeverybody.Findasmanydifferencesasyoucanbetweenthem.同位语从句定语从句从句和先行词关系从句具体说明，解释先行词从句修饰，限制先行词that在从句中的作用that在同位语从句中不担当句子成分that在定语从句中担当句子成分（主语/宾语）that能否省略不能省略充当定语从句的宾语时，可以省略同位语从句与定语从句的区别1.____hemadeanimportantspeechatthemeetingwastrue.A.ThatB.WhyC.WhatD.How2.____we’llgocampingtomorrowdependsontheweather.A.IfB.WhetherC.ThatD.Where3.____isknowntousallisthatAmericaisadevelopedcountry_____theFirstWorld.A.Which;belongtoB.As,belongedtoC.What;belongingtoD.It;belongingtoABC单项选择4.It’sknowntousall____aformofenergy.A.waterisB.thatwaterisC.iswaterD.thatwaterto5.Itworriedherabit____herhairwasturninggray.A.whetherB.thatC.whatD.when6.WhatIsayandthink____noneofyourbusiness.A.isB.areC.hasDhaveBBA7.____madetheschoolproudwas____morethan90%ofthestudentshadbeenadmittedtokeyuniversities.A.What/becauseB.What/thatC.That/whatD.That/because8.____shecouldn’tunderstandwas___fewerandfewerstudentsshowedinterestinherlessons.A.What/whyB.That/whatC.What/becauseD.Why/thatBA9.Heisabsentfromschool.Itis____heisseriouslyill.A.whyB.becauseC.thatD.thereason10.Wemadethesuggestionthathe_____hiswork.A.continuesB.continueC.continuedD.hadcontinuedBB11._____hashelpedtosavethedrowninggirlisworthpraising.A.WhoB.TheoneC.AnyoneD.Whoever12.Informationhasbeenputforward____moremiddleschoolgraduateswillbeadmittedintouniversities.A.thatB.howC.whereD.whatDA13.–IdrovetoZhuhaifortheairshowlastweek.--Isthat____youhadafewdaysoff?AwhyBwhenCwhatDwhere14.--Areyoustillthinkingaboutyesterday’sgame?--Oh,that’s____.AwhatmakesmefeelexcitedBwhateverIfeelexcitedaboutChowIfeelaboutitDwhenIfeelexcitedAA15.____fashiondiffersfromcountrytocountrymayreflecttheculturaldifferencesfromoneaspect.A.WhatB.ThatC.ThisD.Which16.Whenyouanswerquestionsinajobinterview,pleaserememberthegoldenrule:Alwaysgivethemonkeyexactly____hewants.A.whatB.whichC.whenD.thatBA17.Therewillbeaspecialpricefor____buysthingsinlargenumberhere.A.whoB.whomC.whoeverD.Whomever18.Marywroteanarticleon____theteamhadfailedtowinthegame.A.whyB.whatC.whoD.that19.Thepooryoungmanisreadytoaccept____helphecanget.A.whicheverB.howeverC.whateverD.wheneverCAC20.Manynewspaperprintedthegovernor’sstatement_____wouldsupportataxcut.A.andheB.wasthatheC.whic