名词性从句的功能相当于名词词组，是学生需要掌握的知识点，下面的小编将为大家带来高中英语的名词性从句的知识点介绍，希望能够帮助到大家。
高中英语名词性从句的知识点
一. 主语从句
主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
1. It 作形式主语和it引导强调句的比较
It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人时也可用who/whom。例如：
a It is a pity that you didn’t go to see the film. 你不去看那场电影真可惜。
b It doesn’t interest me whether you succeed or not.我对你成功与否不感兴趣。
c It is in the morning that the murder took place.谋杀案是在早上发生的。强调句型
d It is John that broke the window.是John打碎的窗户。强调句型
2. 用it 作形式主语的结构
1 It is + 名词 + 从句
It is a fact that … 事实是…
It is an honor that …非常荣幸
It is common knowledge that …是常识
2 It is + 形容词 + 从句
It is natural that… 很自然…
It is strange that… 奇怪的是…
3 It is + 不及物动词 + 从句
It seems that… 似乎…
It happened that… 碰巧…
It appears that… 似乎…
4 It + 过去分词 + 从句
It is reported that… 据报道…
It has been proved that… 已证实…
It is said that… 据说…
3. 主语从句不可位于句首的五种情况：
1if 引导的主语从句不可居于复合句句首。
2It is said /reported…结构中的主语从句不可提前。例如：
正确表达：It is said that President Jiang will visit our school next week.
错误表达：That President Jiang will visit our school next week is said.
3It happens/occurs…结构中的主语从句不可提前。例如：
正确表达：It occurred to him that he failed in the examination.
错误表达：That he failed in the examination occurred to him.
4It doesn’t matter how/whether …结构中的主语从句不可提前。例如：
正确表达：It doesn’t matter whether he is wrong or not.
错误表达：Whether he is wrong or not doesn’t matter.
5含主语从句的复合句是疑问句时，主语从句不可提前。例如：
正确表达：Is it likely that it will rain in the evening?
错误表达：Is that will rain in the evening likely?
4. what 与that 在引导主语从句时的区别
what 引导主语从句时在句时在从句中充当句子成分，如主语.宾语.表语，而that 则不然。例如：
a What you said yesterday is right.
b That she is still alive is a consolation
二.宾语从句
宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词 及物动词 或介词之后。
1. 作动词的宾语
1 由that引导的宾语从句that通常可以省略, 例如：
I heard that be joined the army. 我听说他参军了。
2 由what, whether if 引导的宾语从句，例如：
a She did not know what had happened.她不知道发生了什么。
b I wonder whether you can change this note for me.我想知道你是否能帮我改一下笔记。
3 动词+间接宾语+宾语从句。例如：
She told me that she would accept my invitation.她对我说她会接受我的邀请。
2. 作介词的宾语，例如：
Our success depends upon how well we can cooperate with one another.我们的成功取决于我们之间的合作。
3. 作形容词的宾语，例如：
I am afraid that I’ve made a mistake.我恐怕我已经犯了一个错误。
注意：that 引导的从句常跟在下列形容词后作宾语：anxious, aware,
certain, confident, convinced, determined, glad, proud, surprised, worried,
sorry, thankful, ashamed, disappointed, annoyed, pleased, hurt, satisfied,
高中英语主语从句的知识点
主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
1. It 作形式主语和it引导强调句的比较。
It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人是也可用who/whom。
例如：
It is a pity that you didn’t go to see the film.
It doesn’t interest me whether you succeed or not.
It is in the morning that the murder took place.
It is John that broke the window.
2. 用it 作形式主语的结构。
1 It is +名词+从句
It is a fact that … 事实是…
It is an honor that …非常荣幸
It is common knowledge that …是常识
2 it is +形容词+从句
It is natural that… 很自然…
It is strange that… 奇怪的是…
3 it is +不及物动词+从句
It seems that… 似乎…
It happened that… 碰巧…
4 it +过去分词+从句
It is reported that… 据报道…
It has been proved that… 已证实…
3. 主语从句不可位于句首的五种情况。
1 if 引导的主语从句不可居于复合句句首。
2 It is said ， reported …结构中的主语从句不可提前。
例如：
It is said that President Jingo will visit our school next week. right
That President Jiang will visit our school next week is said. wrong
3 It happens…， It occurs… 结构中的主语从句不可提前。
例如：
It occurred to him that he failed in the examination. right
That he failed in the examination occurred to him. wrong
4 It doesn’t matter how/whether …结构中的主语从句不可提前。
例如：
It doesn’t matter whether he is wrong or not. right
Whether he is wrong or not doesn’t matter. wrong
5 含主语从句的复合句是疑问句时，主语从句不可提前。
例如：
Is it likely that it will rain in the evening? right
Is that will rain in the evening likely? wrong
4. What 与that 在引导主语从句时的区别。
What 引导主语从句时在句时在从句中充当句子成分，如主语.宾语.表语，而that 则不然。
例如：
1 What you said yesterday is right.
2 That she is still alive is a consolation.
宾语从句
宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词及物动词或介词之后。
1. 作动词的宾语。
1 由that引导的宾语从句that 通常可以省略
例如：
I heard that be joined the army.
2 由what， whether if 引导的宾语从句
例如：
1 She did not know what had happened.
2 I wonder whether you can change this note for me.
3 动词+间接宾语+宾语从句
例如：
She told me that she would accept my invitation.
