PredicativeClauses表语从句表语从句的定义：在复合句中作表语的从句叫做表语从句。表语从句对主语进行解释、说明，使主语的内容具体化。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。Eg.Thatiswhyhedidin’tcome.连接词：that/whether/asif/asthough连接代词：who/whom/whose/which/what连接副词：when/where/why/how/because1.Thequestioniswhetherwecanrelyonhim.2.That’sbecausewewereinneedofmoneyatthattime.3.Helookedasifhewasgoingtocry.4.That’swhyIwaslate.引导词的用法（一）that在表语从句中,又。Thefactisthathehasn’tyetrecoverfromillness.Thereasonwhyhehastogoisthathismotherisillinbed.既不充当成分没有意义•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:1.Whatthedoctorreallydoubtsiswhethermymotherwillrecoverfromtheseriousdiseasesoon.2.Thequestioniswhetheritisworthdoing.“是否”不能引导词的用法（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）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、宾语也可用（whom)或表语谁引导词的用法（四）which在引导表语从句时,常充当_____________表示。如：Ireadaboutitinsomebookoranother,butwhatIdon’tknowiswhich(book)itis.定语,表语其中哪一个引导词的用法（五）由asif,asthough引导表语从句，表示好像。句子中的系动词常用look,appear,seem等。1.Itlooksasifitwasdoingtorain.2.Theyoungmanwithlonghairlooksasifhewereagirl.引导词的用法（六）当主句的主语为reason,或者是由why引导的从句时,与它们相关的表语从句用_________,而不能由_______引导;because引导表语从句时只能用于________________________句型中.1.ThereasonwhyIwaslatewasthatImissedthetrain.2.Iwaslate.It/That/ThiswasbecauseImissedthetrain.that来引导becauseIt/That/Thisis/wasbecause…引导词的用法（七）当表语从句中主语、宾语、表语具备，但是还是要表示疑问含义，可以判断句子中缺少状语，常常用相应的特殊疑问词引导，有why,when,where,how等Thisishowhedidit.Thatiswhythebrotherswantedtomakeabet.That’swhywe’vegivenyoutheletter.引导词的用法（八）表语从句引导词注意事项1.that引导表语从句时不能省.2.if不能引导表语从句.3.除that外的所有引导词都有自己的意义。4.除that,whether外的所有引导词都须在从句中充当相应的成分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.when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.
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