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1、高考英语名词性从句用法大全名词性从句 名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。因此，名词性从句厅分为主语从句、表语从句、宾语从句和同位从句。（一）引导名词性从句的连接词 1、连接代词：who, whose, whom, what, which。有词义，在从句中担任成分，如主语、表语、宾语、或定语等。 2、连接副词：when, where, why, how。有词义，在从句中担任成分，作状语。 3、连接词：that, whether, if, as if。that 无词义，在从句中不担任成分，有时可省略；if (whether), as if虽有词义，但在从句中不担任成分。
2、 注意：连接代词与连接副词在句中不再是疑问句，因而从句中谓语不用疑问式。连接代词与连接副词在从句充当句子成分，连接词whether 和if（是否），as if（好象）在从句中不充当句子成分，只起连接作用。根据句义，如果连接代词与连接副词，whether、if 和as if都用不上时，才用that作连接词（that本身无任何含义）。（二）主语从句 1、主语从句在复合句作主语。 e.g. Who will go is not important. 2、用it作形式主语，主语从句放在句末。 e.g. It doesnt matter so much whether you will come or
3、not. 3、that引导主语从句时，不能省略。 e.g. That he suddenly fell ill last week made us surprised.（三）表语从句 1、表语从句在复合句中作表语，位于系动词之后。 e.g. The question was who could go there. 2、引导表语从句的连接词that有时可省去。 e.g. My idea is (that) we can get more comrades to help in the work.（四）宾语从句 1、宾语从句在复合句中作宾语。引导宾语从句的连词that一般可省略。 e.g. I h
4、ope (that) everything is all right. 2、介词之后的宾语从句，不可用which或if连接，要分别用what或 whether。 e.g. Im interested in whether youve finished the work. Im interested in what youve said. 3、whether与if都可以引导宾语从句，常可互换。但下面情况不能互换。 宾语从句是否定句时，只用if，不用whether。e.g. I wonder if it doesnt rain.用if 会引起误解，就要用whether。e.g. Please le
5、t me know whether you want to go.（此句如果把whether改成if，容易当成条件句理解）宾语从句中的whether 与or not直接连用，就不能换成if；不直接连用，可换。e.g. I dont know whether or not the report is true.I dont know whether/ if the report is true or not.介词后的宾语从句要用whether引导。whether 可与不定式连用。whether也可引导主语从句、表语从句、同位语从句，还可引导让步状语从句，以上均不能换成if。但引导条件从句时，只能
6、用if，而不能用whether。e.g. It depends on whether we have enough time. They dont know whether to go there. Please come to see me if you have time.（五）同位语从句同位语从句在句中作某一名词的同位语，一般位于该名词（如：news, fact, idea, suggestion, promise等）之后，说明该名词的具体内容。e.g. I have no idea when he will be back. The fact that he had not said
7、anything surprised everybody.英语名词性从句详解主语从句、表语从句、宾语从句、同位语从句在复合句中起名词的作用，这四种从句合称名词性从句。它们在主句中充当主语、表语、宾语或同位语，都不能用逗号与主句分开。(注：句中划线部分为从句)主语从句1、定义：先找到句子的谓语，主句的谓语前面的从句，叫做主语从句。Why he left wasnt important.(wasnt是主句的谓语动词，why he left做主语从句)That she became an artist may have been due to her fathers influence.(may h
8、ave been due是主句的谓语动词，that she became an artist做主语从句)2、借助形式主语it，主语从句放在后面由that引导的主语从句可以放在主语的位置，这时that不可以省略。例如：That prices will go up is certain.that主语从句放在句首的情况不是很常见，绝大部分主语从句都借助形式主语it，主语从句放在后面。It is strange that he knows nothing about it.It is a pity that he cant swim.It happened that he wasnt in that
9、day.It is said that there has been an earthquake in India.在口语中，用it做形式主语时，主语从句的that可以省略。wh-疑问词引导的主语从句，可以放在句首(第一组)，也可以借助形式主语it(第二组)。第一组：When hell be back depends much on the weather.How it was done was a mystery.Whether well succeed remains to be seen.第二组：It is uncertain whether the game will be held.
10、Its a puzzle how life began.It doesnt matter much where we live.Is it known where he went？宾语从句1、定义：及物动词(第一组)和介词(第二组)的后面可以接从句做宾语，叫做宾语从句。第一组I guess(that) well leave soon.He asked when we would be in London.She informed me (that) she was to send for it the next day.(that可以省略)Ill tell you what I read in
11、 todays paper.第二组Ill find out whether shes interested in going.Can you give us a description of what has happened.She was shocked by what she had seen.2、借助形式宾语it，that引导的宾语从句放在后面。Ive heard it said that you have won a scholarship.分析：it在句中做形式宾语，said做宾语补足语，that you have won a scholarship是真正的宾语。She has s
12、een to it that all the children are well taken care of.分析：it在句中做形式宾语，that all the children are well taken care of是真正的宾语。表语从句1、定义：系动词的后面可以接句子做表语，叫做表语从句。The fact is that she never liked him.That is not what I meant.The question is who is responsible for what has happened.She is no longer what she used
13、 to be.2、注意：The reason Hollywood was a good place for making movies was that the sun shines there every day.分析：the reason做主语时，表语从句用that引导。引导表语从句的that一般不省略。同位语从句1、定义：有些名词的后面可以跟that引导的从句，说明这个名词的内容，这样的从句叫做同位语从句。所以，只有可以有内容的名词才可以接同位语从句，例如：fact，message，idea，possibility，conclusion，thought，news，order，report
14、，rumor等等。that在从句中不做成分，但是不能省略。He had the feeling that he would not see her again.Ive come to the conclusion that it wont be wise to do so.2、有时为了保持句子的平衡，同位语从句有时和前面的名词分开。The rumor spread that a new school would be built here.that引导的同位语从句修饰the rumor，但是主句The rumor spread太短，如果把后面的同位语从句放在the rumor后面，主语太长，给
15、人头重脚轻的感觉。3、在少数情况下，名词性从句的其他关联词也可以引导同位语从句。但if不可以引导同位语从句。You have no idea how worried I was.I have no idea why she left.There is some doubt whether John will come on time.在学习名词性从句时注意下面四点：一、名词性从句要用陈述语序，也就是说：名词性从句的关联词做主语的话，关联词后面接谓语动词；名词性从句的关联词不做主语的话，关联词后面接从句的主语和谓语。I dont know who broke the window.(宾语从句中关联词who做主语，broke是谓语动词)The little boy told his mother where he found the coin.(宾语从句中关联词where不做主语，where后面
