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1、 Revision： 定语从句的功用 ：相当于一个形容词，修饰一个 名词或代词（即先行词）。常 紧跟在先行词后，作定语用。 如：I dont like the man who wears a beard.宾语从句的功用：相当于一个名词，作宾语表语从句的功用： 如：I dont know where I can got so much money. It depends on whether we have enough money.I am sure that he will come this afternoon.相当于一个名词，作连系动词 如:be,look,taste,seem 等后的表
2、语。一、表语从句的定义：表语从句在复合句中作主句的 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：“that”,“whether”The question is whether we should ask them for help.The trouble is that he has never done the work before.2.由连接代词引导。如：“what” “who”“whom”“whose” “which”Guilin is not what it used to be.What she wan
3、ts to know is which dress she should buy.3.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as if ,as though引导。如：It looks as if it were going to rain.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
4、reason why he has to go is that his mother is ill in bed.既不充当成分 没有意义比较 that在定语从句中的用法。There are some films that Id like to see. She is the only student that knows French. 结论:that 在引导定语从句时,指事物,也可指人,在从句中作主语或宾语,作宾语时常可省略。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 mo
5、untain is not what it used to be . 3. What he told you was what had been discussed at the meeting.句子成分什么，什么样子，什么样子人或事另： what 不引导定语从句一些引导词的用法（三） 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 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.一些引导词的用法（四）由as if 引导表语从句时要注意语态.若从句表示 与现在事实相反,谓动用 , 与过去事实相反用一般过去式（be用were） had+p.p.
