四类名词性从句详解

更新时间:2023-07-21 13:20:19 阅读: 评论:0

四类名词性从句详解
所谓名词性从句,就是指其作用相当于名词的从句,它包括主语从句、表语从句、宾语从句和同位语从句。
一、主语从句
1. 引导词:主语从句就是在复合句中用作主语的从句,引导主语从句的引导词主要有三类:一是that;二是whether;三是那些可以用作疑问词的词语,如what, who, which, when, where, how, why等。如:
That we shall be late is certain. 我们要晚了,这是确定无疑的。
What he says is not important. 他说的话并不重要。
How this happened is not clear to anyone. 这件事怎样发生的,谁也不清楚。
Which side wins makes no difference to him. 哪边赢他都无所谓。
Whether it will do us harm remains to be en. 是否对我们有害还要看一看。
2. 形式主语:有时为了避免句子显得头重脚轻,可用it作形式主语放在句首,而把真正的主语放在句末。如:
Its a pity that he didnt come. 很遗憾他没来。
Its not yet known what she did. 她做什么还不得而知。
It was uncertain whether he could come or not. 他是否会来还不肯定。
沙发清洗这三句句首的it均为形式主语,相应的真主语分别是that he didnt come / what she did / whether he could come or not
有效的沟通
二、表语从句
表语从句就是在复合句中用作表语的从句。一般说来,可用于引导主语从句的引导词也可用于引导表语从句,如that, what, who, which, when, where, how, why, whether等。如:
My idea is that we should do it right away. 我的意见是马上就干。
That is what he meant. 这就是他的意思。
The problem is how we can find him. 问题是我们如何找到他。
The morning is when Im busiest. 意大利斗兽场早上是我最忙的时候。
Thats where you are wrong. 这就是你不对的地方。
和泉式部
Thats why he didnt come. 这就是他没有来的缘故。
另外,表语从句还可以用as if, as though, becau等来引导。如:
It is becau he is too foolish. 那是因为他太蠢了。
It is not as though we were poor. 又不是我们家里穷。
三、宾语从句
1. 引导词:宾语从句就是在句中用作宾语的从句。一般说来,可用于引导主语从句的引导词也可用于引导宾语从句,如that, what, who, which, when, where, how, why, whether等。
如:
We believe that he is honest. 我们相信他是诚实的。
She has got what she wanted. 她要的东西得到了。
I havent decided whether I should go. 我还没决定我是否会去。
I asked how he was getting on. 我问他情况怎样。
He asked when the train would get in. 他问火车什么时候进站。
He asked me where I was going. 他问我到哪儿去。
Plea tell me which you like. 告诉我你喜欢哪一个。
He asked who lived next door.  他问谁住在隔壁。
She asked why he was silent. 她问他为什么一言不发。
2. ifwhetherif通常不用于引导主语从句或表语从句,但可以用于引导宾语从句,与whether用法相同,常可互换。如:
I wonder if its large enough. 不知它是否够大。
She didnt say if he was still alive. 她没说他是否还活着。
但是,当于用于介词后引导宾语从句时,只能用whether,不能用if。如:
I worry about whether I hurt her feelings. 我为是否伤了她的感情而忧虑。
3. that的省略:that引导主语从句或表语从句时通常不省略,但引导宾语从句时通常可以省略。如:
She said (that) she didn妈妈的朋友西瓜t want to know. 她说她不想知道。
I dont think (that) shes interested in it. 我想她对这事没有兴趣。
4.攻无不克战无不胜 否定转移:当主句主语为第一人称,且主句谓语动词为think, believe, suppo, expect, i
magine等时,若其后接一个表示否定意义的宾语从句,此时通常应将否定转移到主句上。如:
I dont think that he will leave. 我认为他不会离开。
I dont believe that it is easy. 我相信这不会容易。
四、同位语从句
在复合句中用作同位语的从句叫同位语从句。所谓同位语,就是指两个语法单位指同一个人或事物,并且句法功能也一样,此时我们就把后一项称为前一项的同位语。所谓同位语从句,就是指用于名词后对该名词的内容进行说明解释的从句。如:
The judge paid no attention to the fact that she had just lost her husband. 法官毫不考虑她刚刚失去丈夫一事。
句中的that she had just lost her husband为修饰名词the fact的同位语从句,用以具体说明the fact的内容。
Mary suddenly got the feeling that someone was watching her. 玛丽突然感到有人在看她。
句中的that someone was watching her为修饰名词the feeling的同位语从句,用以具体说明the feeling的内容。
英语中只有少数名词可后接同位语从句,比较常见的有belief, doubt, fact, feeling, hope, idea, message, news, opinion等。
另外,同位语从句的引导词也比较有限,主要是由that引导,有时可也可用when, how, where, whether, who等引导,但是不能用if也引导,也不能用what来引导。如:
本立而道生You have no idea how worried I was! 你不知道我多着急!
He had no idea why she left. 他不知道她为什么离开。
There is some doubt whether he will come. 他是否会来还不一定。
同位语从句与定语从句的区别
(1) 定语从句中的that既代替先行词,同时可以在从句中作某个成分(主语或宾语),而同位语从句中的that是连词,只起连接主句与从句的作用,不充当句中任何成分。
(2) 定语从句是形容词性的,其功能是修饰先行词,对先行词加以限定,描述定的性质或特征;同位语从句是名词性的,其功能是对名词进行补充说明。例如:
1) The news that he told me is that Tom would go abroad next year.(他告诉我的消息是汤姆明年将出国。)(第一个that引导的从句是定语从句,that在从句中作宾语)
2)The news that Tom would go abroad is told by him.(汤姆将出国的消息是他讲的。)(同位语从句,that在句中不作任何成分)
名词性从句专项练习
1.       is a fact       quite a few people in China are growing rich on their hard work.
A. It, that    B. It, which   
C. This, that    D. That, that
2.       leaves the lab last should turn of the lights and lock the door.
A. Anybody    B. The one   
C. Whoever    D. Who
3. It is generally considered unwi to give a child       he or she wants.
A. however    B. whatever   
C. whichever    D. whenever
4.  — For some reason, the cinema caught fire last night.
— It so happened 黄庭坚代表作      nobody was in at that time.
A. which    B. what   
C. that    D. who
5.       will give us the lecture on modern science?
A. Who you think    B. Do you think who
C. Who do you think    D. Whom do you think
6.  — Tom failed in the exam again.
— That is       he didn’t follow the teacher’s advice.

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