1、Predicative Clauses 表语从句表语从句表语从句的定义：表语从句的定义：表语从句在复合句中表语从句在复合句中作主句的表语。表语从句和主语指作主句的表语。表语从句和主语指同一内容，它对主语进行解释、说同一内容，它对主语进行解释、说明，使主语的内容具体化。明，使主语的内容具体化。结构是结构是“主语主语+系动词系动词+表语从句表语从句”。可以接表语从句的系动词有可以接表语从句的系动词有be,look,remain,seem等。等。连接词：连接词：that/whether/as if/as though连接代词：连接代词：who/whom/whose/which/what 连接副词：连
2、接副词：when/where/why/how/because 1.The question is whether we can rely on him.2.Thats because we were in need of money at that time.3.He looked as if he was going to cry.4.Thats why I was late.引导词的用法（一）引导词的用法（一）that在表语从句中在表语从句中 ,又又 。The fact is that he hasnt yet recovered from illness.The reason why h
3、e has to go is that his mother is ill in bed.既不充当成分既不充当成分 没有意义没有意义 whether在表语从句中表在表语从句中表 ,但不但不充当句子的成分。充当句子的成分。if 引导表语从引导表语从句句.如如:1.What the doctor really doubts is whether my mother will recover from the serious disease soon.2.The question is whether it is worth doing.“是否是否”不能不能引导词的用法（二）引导词的用法（二）wha
4、t 在表语从句中充当在表语从句中充当_ 表示表示_.1.The question is what caused the accident.2.That mountain is no longer what it used to be.3.What he told you was what had been discussed at the meeting.主语、宾语或表语主语、宾语或表语什么，什么样子，或所什么，什么样子，或所的（人或事）的（人或事）引导词的用法（三）引导词的用法（三）who 在表语从句中充当在表语从句中充当_表示表示_.1.The problem is who could d
5、o the work2.My trouble is who(whom)I can turn to.主语、宾语或表语主语、宾语或表语谁谁引导词的用法（四）引导词的用法（四）which 在引导表语从句时在引导表语从句时,常充当常充当_ 表示表示 。如：。如：I read about it in some book or another,but what I dont know is which(book)it is.定语定语,表语表语其中哪一个其中哪一个引导词的用法（五）引导词的用法（五）由由as if,as though引导表语从句，表引导表语从句，表示示好像好像。句子中的系动词常用。句子中的系
6、动词常用look,appear,seem等。等。1.It looks as if it was doing to rain.2.2.The young man with long hair looks as if he were a girl.引导词的用法（六）引导词的用法（六）当主句的当主句的主语为主语为reason,或者是或者是由由why引导的从句引导的从句时时,与它们相关的表语从句与它们相关的表语从句用用_,而不能由而不能由_ 引导引导;because 引导表语从句时只能用于引导表语从句时只能用于_句型中句型中.1.The reason why I was late was that I
7、 missed the train.2.I was late.It/That/This was because I missed the train.that来引导来引导becauseIt/That/This is/was because引导词的用法（七）引导词的用法（七）当表语从句中主语、宾语、表语具备，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，可以判断句但是还是要表示疑问含义，可以判断句子中子中缺少状语缺少状语，常常用相应的特殊疑问，常常用相应的特殊疑问词引导，有词引导，有why,when,where,how等等This is how he did it.That is w
8、hy the brothers wanted to make a bet.Thats why weve given you the letter.引导词的用法（八）引导词的用法（八）表语从句引导词注意事项表语从句引导词注意事项1.that引导表语从句时不能省引导表语从句时不能省.2.if不能引导表语从句不能引导表语从句.3.除除that外的所有引导词都有自己外的所有引导词都有自己的意义。的意义。4.除除that,whether外的所有引导外的所有引导词都须在词都须在从句中充当相应的成从句中充当相应的成分分 1.Thats _ the Party called on us to do.A.why
9、 B.what C.how D.that 2.The reason is _ he is unable to operate the machine.A.because B.why C.that D.Whether3.That is _ they separated.A.that B.what C.which D.where 4.Jane is no longer _ she was four years ago.A.what B.which C.that D.when 名词主语名词主语+be+that引起的表语从句引起的表语从句主语名词常常是主语名词常常是表示事实，真理的名词，如：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，表示看法，观点、问题、麻烦的名词，如：如：idea,opinion,belief,view,news,advice,feeling,suggestion,plan,trouble,question,problem,1.The fact is that our team has won the game.2.The truth is that she was the very person we are looking for.
