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Grammar表语从句一、表语从句的定义：表语从句放在连系动词之后，充当复合句中的表语。Thequestioniswhowilldoit.系动词表语从句作用:对主语进行解释说明。二、表语从句的构成：主语+系动词+引导词+简单句WhatIwanttosayisthatIamtired.引导词表语从句主语系动词三、表语从句的系动词：be,look,seem,sound,appear,remainChinaisnolongerwhatsheusedtobe.今日的中国不再是过去的中国了。Thequestionremainswhethertheywillbeabletohelpus.问题还是他们能否帮我们。Atthattime,itseemedasifIcouldn'tthinkoftherightword.当时，我似乎怎么也想不出一个恰当的字眼来。1.that引导的表语从句that仅起连接作用，在句中不充当任何成分，但不能省略。从句对主句的内容起进一步解释的作用。其基本结构为“主语+系动词+that从句”MyideaisthatweshouldfinishourhomeworkbeforewatchingTV.ThetroubleisthatIhavelosthisaddress.四、表语从句的连接词：2.whether引导的表语从句whether在句中起连接作用，意为“是否，究竟，到底”注意：if不能引导表语从句Thequestioniswhetherwecanrelyonhim.问题是我们是否可以信任他。3.连接代词who,whom,whose,what,which除在句子中起连接作用外，同时也在句中充当主语、宾语、表语或定语。连接副词where,when,how,why，除在句中起连接作用外，在从句中还充当时间、地点、方式或原因状语。如：Theproblemiswhowecangettoreplaceher.问题是我们能找到谁去替换她呢。Thequestionishowhedidit.问题是他是如何做此事的。Thatwaswhatshedidthismorningonreachingtheattic.那就是她今晨上了阁楼干的。4.其他连词或连词词组1）asif/though引导的表语从句常位于系动词look，seem，sound，feel后面，且常用虚拟语气。Itlooksasifitisgoingtorain.Helooksasifhewereasoldier.2)This/That/Itisbecause…这/那是因为…（强调原因）because引导表语从句，this、that、it是指示代词，一般指上文中出现的某件事情。Youarenervouswhenmakingaspeechinfrontoftheclass.That’sbecauseyouarenotconfidentenough.3）That’swhy…那就是…的原因（强调结果）That’swhyIwantyoutoworkthere.那就是我要你在那儿工作的原因。That’swhyIdon’tfinishthetaskintime.那就是我不能及时完成任务的原因。4）Thereasonwhy…isthat……的原因是…why引导的是定语从句修饰先行词reason，that引导的是表语从句。Thereasonwhyhewaslatewasthatitwasrainingheavily.他来晚的原因是因为天在下大雨。ThereasonwhyIwassadwasthathedidn'tunderstandme.我难过的原因是他没有理解我。如果主语是表示建议、劝告、命令、要求含义的名词，常见的如：advice,suggestion,order,proposal,plan,idea等，其后的表语从句常用虚拟语气，从句谓语用“should+动词原形”表示，should可省略。Mysuggestionisthatwe(should)startearlytomorrow.我的建议是我们明天一早就出发。5.使用虚拟语气的表语从句所有的表语从句都用陈述语序，即连接词+主语+谓语+其他Theproblemwasthatnoonewaswillingtotakeresponsibilityforthismatter.问题是没人愿意为这件事负责。五、语序六、时态1.若主句的谓语动词是一般现在时，表语从句根据实际情况使用相应的时态。ThequestioniswhowilltravelwithmetoBeijingtomorrow.Thequestioniswhyhecriedyesterday.2.若主句的谓语动词是一般过去时，表语从句一般也用过去时。WhatIwasuncertainaboutwaswhethertheycoulddotheworkwell.3.如果主句的中心词是suggestion,proposal,order,request等，表语从句一般要用虚拟语气，其谓语形式为should+动词原形，should可省略。Myadviceisthathe(should)nottelllies.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.Thatis______LuXunoncelived.A.whatB.whereC.thatD.why11.Thereasonwhyhehasn’tcomeis_____.A.becausehismotherisillB.becauseofhismother’sbeingillC.thathismotherisillD.forhismotherisill12.—Hewasbornhere.--Thatis_____helikestheplacesomuch.A.thatB.whatC.whyD.how13.Hissuggestionisthatwe______ourhomeworkfirst.A.willfinishB.finishC.finishedD.finishing用适当的引导词填空1.Thetroubleis________Ihadnomoney.2.Hegotcaughtintheheavytraffic.Thatwas_______hewaslate.3.Theproblemis_______wecangettoreplaceher.4.Energyis________makesthingswork.5.Wedidn’tsetout.Itwas________hewantedtowaituntilourmothercameback.6.Thereason______Iwaslatewas_____Isleptlate.thatwhywhowhatbecausewhythat名词性从句连接词的选用that和what的选用that和what都可引导所有的名词性从句。但是，what除起连接作用外，还在名词性从句中充当成分，可作从句的主语、宾语、或表语。而that在名词性从句中不充当任何成分，只起连接作用。that/what1.______hewantsisabook.2.______hewantstogothereisobvious.3.Theresultis______wewonthegame.4.Thisis_____wewanttoknow.5.Is_____hetoldustrue?6.Weshouldpayattentionto______theteacherissaying.7.Ihavenodoubt_____hewillcome.8.Ihavenoidea____hedidthatafternoon.WhatThatthatwhatwhatwhatthatwhat