1、,Predicative Clauses 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.That is why he didint come.,连接词：that / whether /as if /as though 连接代词：who / whom / whose / which / what 连接副词：when / where / why / how / because,1.The question is whet
2、her 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）,that在表语从句中 ,又 。 The fact is that he hasnt yet recover from illness. The reason why he has to go is that his mother is ill in bed.,既不充当成分 没有意义,wheth
3、er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.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”,不能,引导词的用法（二）,what 在表语从句中充当_ 表示_. 1. The question is what caused the accident. 2. That mountain is no longer what it use
4、d to be . 3. What he told you was what had been discussed at the meeting.,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_. The problem is who could do the work 2. My trouble is who (whom) I can turn to.,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：I read about it in some book or anoth
5、er,but what I dont know is which (book) it is.,定语,表语,其中哪一个,引导词的用法（五）,由as if ,as though引导表语从句，表示好像。句子中的系动词常用look, appear, seem等。 It looks as if it was doing to rain. 2.The young man with long hair looks as if he were a girl.,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
6、只能用于_句型中. 1.The reason why I was late was that I missed the train. 2. I was late. It/That/This was because I missed the train.,that来引导,because,It/That/This is /was because,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 This is how he did it. That is why the
7、brothers wanted to make a bet. Thats why weve given you the letter.,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. Thats _ the Party called on us to do.A. why B. what C. how D. that 2. The reason is _ he is unable to operate th
8、e machine.A. because B. why C. that D. Whether 3 .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+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.The fact is that our team has won the game. 2.The truth is that she was the very person we are looking for.,
