名词性从句
概念
在复合句中起名词作用的从句叫作名词性从句。
种类
主语从句、宾语从句、表语从句和同位语从句。
注：由于名词性从句在句中不同的句法功能（即名词性从句在复合句中，能充当主语、宾语、表语、同位语等。），相应地，名词性从句可以分为主语从句、宾语从句、表语从句和同位语从句。
引导词
类别 功能 例词
从属连词 指起连接作用，不充当从句中的任何成分 that, whether, if
连接代词 既起连接作用，本身又作从句的主语、宾语、表语或定语 who, whom, whose, which, what,
whoever, whatever, whichever
连接副词 既起连接作用，本身又作从句的状语 when, where, how, why，whenever，wherever，however
主语从句
主语从句可直接放在句首，也可用形式主语it代替，而将主语从句后置。
that引导的主语从句
1) that引导的主语从句置于句首（that此时在从句中不充当任何成分，无含义，只起连接作用，不能省略）
That the earth moves around the sun is known to all.
注：从句作主语，谓语动词用单数形式。
2) 在that引导的主语从句中，常用it作形式主语，that引导的真正的主语从句后置，常见的此类句型有：
① It+系动词+形容词+that从句。
常用于这种结构的形容词有：
necessary 必要的 certain 明确的
right 正确的 clear 清晰的
(un)likely （不）可能的 possible 可能的
strange 奇怪的 obvious 明显的
natural 自然的 important 重要的
1 名词性从句
PART 1
完成以下题目，并分别指出它们是什么从句
1.______ the baby could speak made his parents very happy.
A. That B. What C. Why D. If
2. I wonder ______ you will go shopping or stay at home.
A. that B. if C. whether D. what
3. This is ______ he was often late for school.
A. what B. that C. why D. whether
4. We all know the truth ______ the earth ______ around the sun.
A. if; moved B. that; moves C. why; move D. whether; move
名词性从句的功能： 相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等。
His job is important. (主语)
What he does is important. (主语)
This is his job. (表语)
This is what he does every day. (表语)
I don’t like his job. (宾语)
I don’t like what he does every day. (宾语)
1 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，名词性从句分为主语从句、表语从句、宾语从句和同位从句。宾语从句——在复合句中作主句及物动词的宾语，也可作介词或某些形容词的宾语1.连接词从属连词that whether if不担任成分只起连接作用关系代词who whom whose what which既担任成分，又起连接作用。主语，宾语或表语等关系副词when where why how既担任成分，又起连接作用常担任状语I think (that) you will like the pictures. He has become what he wanted to be ten years ago. I don’t know why Jane was late for school this morning. The teacher is pleased with what she said. I'm afraid that I can't go to the party.2.注意事项①由that 引导的宾语从句(that通常可以省略)。但如从句是并列句时,第二个分句前的that不可省。He told me (that) he was ill and that he would not come to the party. ②陈述语序I want to know what he has told you. She will give whoever needs help a warm support.③注意宾语从句中的时态呼应。当主句动词是现在时，从句根据自身的句子情况，而使用不同时态。当主句动词是过去时态（could, would除外），从句则要用相应的过去时态，如一般过去时，过去进行时，过去将来时等；当从句表示的是客观真理，科学原理，自然现象，则从句仍用现在时态。④否定转移若主语谓语动词为think, consider, suppose, believe, expect, guess, imagine等, 其后的宾语从句若含有否定意义, 一般要把否定词转移到主句谓语上, 从句谓语用肯定式。I don’t think this dress fits you well.我认为这件衣服不适合你穿。⑤形式宾语it常可以放在动词think, find, consider, believe, feel, make等后作为形式宾语. it不仅可以作为形式主语，还可以作为形式宾语而真正的宾语-that从句则放在句尾, 特别是在带复合宾语的句子中。We often hears it that travel boarden the mind.
高考英语名词性从句知识讲解
名词性从句是指在复合句中起名词作用的句子，功能相当于名词词组。
名词性从句在复合句中能作主语、宾语、表语、同位语等，根据在句中的语法功能可分为主语从句、宾语从句、表语从句和同位语从句。
一、主语从句
【定义】
在复合句中，作主语的句子称为主语从句。
常见的连接词：（连接词在句中不能省略）
that, whether, who, what, whatever, whoever, where, when, why, how等。
【用法】
1.连接词 that 引导
That we should learn English well is very important.
主语从句中 we should learn English well句子完整，不缺成分，用that引导，that 不能省
连接词whether，if 引导
whether 引导的主语从句可放句首，也可放句中，表 “是否”
if 引导的主语从句只能引导动词后的宾语
Whether I will go or not depend on the weather.
It remains to be seen whether / if they can finish the task in time.
2.连接代词what, who, which, whose, whatever, whichever，whoever等引导
What matters most is your attitude.
3.连接副词when，where，why，how等引导
How he made it is still unknown.
4.it作形式主语
为了避免句子头重脚轻，通常把形式主语it放在句首，真正的主语放在句子后面。
常见句型：
(1) It is + n.+ that + 句子
It is +（a pity / a shame / a fact …）+ that ...
