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1、Unit2 The Predictive ClauseRevision：定语从句的功用：相当于一个形容词形容词，修饰一个名词或代词（即先行词）。常紧跟在先行词后，作定语定语用。如：如：I dont like the man who wears a beard.宾语从句的功用：相当于一个相当于一个名词名词，作及物动词、，作及物动词、形容词或介词后的形容词或介词后的宾语宾语表语从句的功用：如：如：I dont know where I can got so much money.It depends on whether we have enough money.I am sure that he
2、 will come this afternoon.相当于一个名词名词，作连系动词如:be,look,taste,seem 等后的表语表语。一、表语从句的定义：表语从句在复合句中作主句的作主句的表语表语。表语从句和主语指同一内容，它对主语进行解释、说明解释、说明，使主语的内容具体化。二、表语从句的表现形式1.由从属连词引导。如：由从属连词引导。如：“that”,“whether”The question is whether we should ask them for help.The trouble is that he has never done the work before.2.由
3、连接代词引导。如：由连接代词引导。如：“what”“who”“whom”“whose”“which”Guilin is not what it used to be.What she wants to know is which dress she should buy.3.由连接副词引导。如：由连接副词引导。如：“when”“why”“where”“how”“because”That is where Lu Xun used to live.That is why he didnt pass the exam.4.另可由另可由as if,as though引导。引导。如：It looks a
4、s if it were going to rain.表语从句两大要素:1.除除that外的所有引导词都外的所有引导词都有自己的意义有自己的意义。2.除除that,whether外的所有引导词都外的所有引导词都须在从句须在从句中充当相应的成分中充当相应的成分。一些引导词的用法（一）一些引导词的用法（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.既不充当成分既不充当成分 没有意义没有意义
5、比较比较在定语从句中的用法。There are some films that Id like to see.She is the only one among us that knows French.结论:that 在引导定语从句时引导定语从句时,指事物,也可指人,在从句中作主语或宾语作主语或宾语,作宾语时常可省略。一些引导词的用法（二）一些引导词的用法（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 used to be.3.What h
6、e 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）另：另：what 不引导定语从句不引导定语从句一些引导词的用法（三）一些引导词的用法（三）Which 在引导表语从句时,常充当_ 表示 。如：I read about it in some book or another,but what I dont know is which(book)it is.比较比较在定语从句中的用法。China is a country which has a h
7、istory of 2000 years.A dictionary is a book which gives the meaning of words.定语定语,表语表语其中哪一个其中哪一个结论:which在引导定语从句时引导定语从句时,指事物,在从句中作主语或宾语作主语或宾语,作宾语时常可省略一些引导词的用法（四）一些引导词的用法（四）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.如:The reason why I was late was that I missed the trai
8、n.I was late.It/That/This was because I missed the train.that来引导becauseIt/That/This is/was because一些引导词的用法（五）一些引导词的用法（五）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:What the doctor really doubts is whether my mother will recover from the serious disease soon“是否”不能1.Li Lei is now in a new jacket.He looks as
9、 if he were an American boy.2.The girl is giving us a vivid description of the moon.It seems as if she had been to the moon many times.3.It looks as if it might rain.4.The clouds are gathering.it looks as if it is going to rain.一些引导词的用法（六）一些引导词的用法（六）由由as if,as though引导表语从句时要注意语态引导表语从句时要注意语态.若从句若从句表示与现在事实相反表示与现在事实相反,谓动用谓动用 ,与过去事实相反用与过去事实相反用 或表示将来或表示将来的可能性不大，则用的可能性不大，则用 .一般过去式（一般过去式（be用用were）had+p.p.Would(might,could)+v原原