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ThePredicativeClause表语从句1、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2.表语从句的构成主语+系动词+引导词+简单句Thisiswhyhedidit.表语从句放在系动词之后，充当复合句中的表语。WhatIwanttosayisthatIamtired语序：有疑问词/引导词+陈述语序That'swhathewants.那是他想要的。Thisiswheretheyoncelived.这就是他们曾经住过的地方。3.接表语从句的系动词：1:be（being,been,am,is,are,was,were)2:feel,seem,look,appear,sound,taste,smell3:stand,lie,remain,keep,stay4:become,get,grow,turn,go,come,run,fall5:prove,turnout4.接表语从句的引导词连接词：that/whether/asif/asthough(if不引导表语从句)连接代词：who(ever)/whom/whose/which(ever)/what(ever)连接副词：when/where/why/how/because5.引导词的用法（一）that在表语从句中,又。既不充当成分没有意义不能省略Thefactisthathehasn’tyetrecoverfromillness.Thereasonwhyhehastogoisthathismotherisillinbed.1.名词主语+be+that引起的表语从句主语名词常常是表示事实，真理的名词，如：fact,truth表示看法，观点、问题、麻烦的名词，如：idea,opinion,belief,view,news,advice,feeling,suggestion,plan,trouble,question,problem,1.Thefactisthatourteamhaswonthegame.2.Thetruthisthatshewastheverypersonwearelookingfor.注意(2)表示“建议，劝说，命令”的名词idea,suggestion,request,proposal等后面的表语从句中，谓语动词用“（should）+动词原形”，should可省略Myopinionisthatit’sgettingbetterandbetter.Mysuggesstionisthatwe(should)startearlytomorrow.•whether在表语从句中表,但不充当句子的成分。if引导表语从句.如:Whatthedoctorreallydoubtsiswhethermymotherwillrecoverfromtheseriousdiseasesoon.Thequestioniswhetheritisworthdoing.“是否”不能5.引导词的用法（二）what在表语从句中充当______________表示____________________________.1.Thequestioniswhatcausedtheaccident.2.Thatmountainisnolongerwhatitusedtobe.3.Whathetoldyouwaswhathadbeendiscussedatthemeeting.主语、宾语或表语什么，什么样子，或所…的（人或事）5.引导词的用法（三）who在表语从句中充当______________表示____.1.Theproblemiswhocoulddothework2.Mytroubleiswho(whom)Icanturnto.主语、宾语或表语谁5.引导词的用法（四）which在引导表语从句时,常充当_____________表示。如：Ireadaboutitinsomebookoranother,butwhatIdon’tknowiswhich(book)itis.定语,表语其中哪一个5.引导词的用法（五）where,when,why,how引导的表语从句连接副词where,when,why,how除在句中起连接作用外，在从句中还充当时间、地点、方式、原因状语，本身具有词义。e.g.That’swhereIcan’tagreewithyou.ThisiswhySarawaslateforthemeeting.Thisishowtheyovercomethedifficulties.MystrongestmemoryiswhenIattendedanAmericanwedding.5.引导词的用法（六）asif,asthough引导的表语从句asif/though引导的表语从句常置于连系动词look,seem,sound,be,become等后面，常用虚拟语气，表示不存在的动作或状态。e.g.Itsoundsasif/thoughsomebodywasknockingatthedoor.主语+连系动词（look/seem/appear……）+that/asif从句5.引导词的用法（七）注意：asif/asthough引导的表语从句如果是事实，就用陈述语气,如果与事实不符，就用虚拟语气:主句用do,从句用did（be的话变成were）。主句用did，从句用hadp.p)。Itlooksasifhewereherownfather.(与事实不符)Darkcloudsaregathering.Itlooksasifitisgoingtorain.because,why引导的表语从句例句：(1)That’sbecausehedidn’tunderstandme.那是因为他不理解我。(强调原因）(2)That’swhyhegotangrywithme.那正是他对我生气的原因。（强调结果）5.引导词的用法（八）（That‘sbecause…强调原因）（That'swhy…强调结果）That‘sbecausehedidn’tunderstandme.1.那是因为他没有理解我。2.那正是他对我生气的原因。That’swhyhegotangrywithme.that,why与because引导表语从句表示原因的区别:1.that没有词义，why强调结果“为什么”，because强调原因“因为”Thereasonwasthatyoudon’ttrusther.原因是你不信任她。Thefactisthattheyareangrywitheachother.事实是他们生彼此的气。Hewasill.That’swhyhewassenttothehospital.他病了，所以被送到医院来。Hewassenttothehospital.That’sbecausehewasill.他被送到医院，是因为他生病了。Shewaslatethismorning.Thatwasbecauseshemissedtheearlybus.Myangerisbecauseyouhaven’twrittentomeforalongtime.2.because引导表语从句通常只用于“This/That/Itisbecause…”结构中。填空:Thereasonwhywedidn'ttrusthimis______hehasoftenlied．Thereasonisthat+原因Thereason+(why…/for…)is/wasthat….that3.reason做主语时，表语从句只能用that引导,不能用why引导。句型结构为：B主句主语为reason,只能用that引导表语从句，不能用because.例题：Thereasonwhyhefailedis________hewastoocareless.A.becauseB.thatC.forD.becauseof用because,that,why填空•Eg.Thereasonwas______theheavyrainpreventedhimfromcoming.•Thereason________wedidn’ttrusthimisthathehasoftenlied.•Itis_______hehasoftenlied，sothatwedidn’ttrusthim.例题1：Thequestionis________wewillhaveoursportsmeetnextweek.A.thatB.ifC.whenD.whetherD注意点1：if不能引导表语从句如果从句是特殊疑问句，用陈述句语序2.Theproblemis_________totaketheplaceofJohn.A.whocanwegetB.whatwecangetC.whowecangetD.thatwecangetC注意：•表语从句中的that不能省略•表语从句中只能用whether不能用if•表语从句中，从句用陈述句语序