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表语从句.定义：在复合句中作表语的从句作用：位于系动词之后，对主语进行解释说明，使主语的内容具体化.一般结构是“主语+系动词+表语从句”可以接表语从句的连系动词有be,look,remain,seem等不作任何成分，可省略Thetroubleisthatweareshortofmoney.困难是我们资金短缺。ThatiswhystonewallsareusedinsteadoffencesaroundNewEnglandfields.这就是为什么在新英格兰用石头墙而不用栅栏的原因。Atthattime,itseemedasifIcouldn'tthinkoftherightwordanyhow.当时,我似乎怎么也想不出一个恰当的字眼来。Myopinionis(that)itisgettingbetterandbetter.Thefactis(that)weshoulddependourfutureonourselves不作任何成分，无意义Thequestioniswhetheritisworthdoingornot.不作成分，不能省略意义：是否，究竟疑问代词whatwhowhichwhomwhoseThisiswhatwealwaysworryabout.Theproblemiswhowillsupportus.WhatImeaniswhichsongyoulikebest.疑问副词whenwherewhyThequestioniswhenwillcompletethework.Thisiswhyshedoesn’twanttoseeyou.Thisiswherehewasborn.充当成分主语，宾语，表语充当成分状语由连词because，asif/asthough等引导的表语从句。1.asif引导表语从句，常置于连系动词lookseemsound,be,become之后Itlookedasifitwasgoingtosnow.看起来好像要下雪了。Itseemsasifhedidn’tknowtheanswer.好像他不知道答案。2.because引导表语从句通常只用于That'sbecauseweneverthoughtofit.这是因为我们从未想过此事。Thisis/wasbecause….Thatis/wasbecause….Itis/wasbecause…注意表语从句一定要用陈述语序。False:Thequestioniswhencanhearriveatthehotel.Right:Thequestioniswhenhecanarriveatthehotel.Thequestioniswhenwillwecompletethework.Thequestioniswhenwewillcompletethework.1.Thequestionis________wewillhaveoursportsmeetnextweek.A.thatB.ifC.whenD.whether2．Thereasonwhyhefailedis________hewastoocareless.A.becauseB.thatC.forD.becauseof3.Goandgetyourcoat.It’s________youleftitA.whereB.thereC.therewhereD.wherethere4．Theproblemis_________totaketheplaceofTedA.whocanwegetB.whatwecangetC.whowecangetD.thatwecanget5.WhatIwanttoknowis______helikesthegiftgivenbyus.A.thatB.ifC.whetherD.不填6.Thereasonis_________Imissedthebus.A.thatB.whenC.whyD.what7.Thatis_____wewerelatelasttime.A.thatB.whenC.whyD.what8.Shelooked_________sheweretenyearsyounger.A.thatB.likeC.asD.asthough9.—Ifellsick!--Ithinkitis_______youaredoingtoomuch.A.whyB.whenC.whatD.because10.Thereasonwhyhehasn’tcomeis___________.A.becausehismotherisillB.becauseofhismother’sbeingillC.thathismotherisillD.forhismotherisill11.—Hewasbornhere.--Thatis_______helikestheplacesomuch.A.thatB.whatC.whyD.how12.Thatis______LuXunoncelived.A.whatB.whereC.thatD.why13．_______yourfatherwantstoknowis________gettingonwithyourstudies.A.What;howareyouB.That；howyouareC.How；thatyouareD.What；howyouare14.Thetroubleis__________weareshortoftools.A.whatB.thatC.howD.whythat15.Americawas__________wasfirstcalled“India”byColumbus.A.whatB.whereC.theplaceD.therewhere