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名词性从句，即指性质相当于名词的从句，它包括主语从句、宾语从句、表语从句和同位语从句。从高考考查的实际情况来看，名词性从句考得最多的是宾语从句，其次是主语从句，再次是表语从句和同位语从句。
一、名词性从句的引导词
1. 连接词that只起连接作用，没有任何意思，也不充当句子成分，在宾语从句中可省略，但引导其他名词性从句时通常不省略。如：
I hope （that） you enjoy your holiday.
That he likes you is very obvious.
2. 连接词whether也不充当句子成分，但有自己的意思，表示“是否”；引导宾语从句时，可换成if，但引导其他名词性从句时不能换成if。
He asked whether （if） I would show him the way.
Whether it will do us harm remains to be seen. （whether引导主语从句，不能用if代替）
3. 连接代词who（m）， whose， which， what，均有各自的意思，在从句中作主语或宾语。如：
That’s what she wanted to get.
What he says is not important.
Tell me which one you like best.
4. 连接副词when， where， why， how也各自有自己的意思，在从句中作状语。如：
The question is how we should carry out the plan.
When she’ll be back depends much on the weather.
Why he did it will remain a puzzle forever.
5. what是一个十分重要的引导词，它可以引导主语从句、宾语从句、表语从句和同位语从句。它引导的名词性从句有两个意思：一是引导宾语从句表示“什么”，带有疑问意味；二是表示“……的”，引导主语从句和表语从句。如：
I don’t know what you want.
I don’t know what you want is this.
That is what I want.
what引导名词性从句时可用作限定词，其后修饰名词，意思是“什么样的……”。如：
I don’t know what books he wants.
What friends he has decides what future he will have.
注：what 后的名词可以是复数名词或不可数名词，但通常不能是单数可数名词。
6. which引导名词性从句时也可用作限定词，其后修饰名词。意思是“哪一个”或“哪一些”。如：
I wonder which book（s） he likes most.
二、主语从句
1. 引导词
主语从句就是在复合句中作主语的从句。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（m）， which， when， where， how， why等。如：
That we shall be late is certain.
How this happened is not clear to anyone.
Which side wins makes no difference to him.
Whether it will do us harm remains to be seen.
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：
It was uncertain whether he could come or not.
三、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（m）， which， when， where， how， why， whether等。如：
My idea is that we should do it right away.
That is what he meant.
The problem is how we can find him.
That’s where you are wrong.
另外，表语从句还可以用as if， as though， because来引导。如：
It is because he is too foolish.
It looks as though/if we will be late.
四、宾语从句
1. 引导词
宾语从句就是在复合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. She has got what she wanted.
I haven’t decided whether I should go.
I asked how he was getting on.
He asked when the train would get in.
He asked me where I was going.
Please tell me which you like.
He asked who lived next door.
She asked why he was silent.
2. if与whether
if通常不用于引导主语从句或表语从句，但可以引导宾语从句。它与whether用法相同，常可互换。如：
I wonder if it’s large enough.
She didn’t say if he was still alive.
但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.
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’t want to know. 她说她不想知道。
I don’t think （that） she’s interested in it. 我想她对这事没有兴趣。
4. 否定转移
当主句主语为第一人称，且主句谓语动词为think， believe， suppose， expect， imagine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 don’t think that he will leave.
I don’t believe that it is easy.
五、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.
句中的that she had just lost her husband是修饰名词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.
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引导，如：
You have no idea how worried I was！
He had no idea why she left.
There is some doubt whether he will come.
一、名词性从句的引导词
1. 连接词that只起连接作用，没有任何意思，也不充当句子成分，在宾语从句中可省略，但引导其他名词性从句时通常不省略。如：
I hope （that） you enjoy your holiday.
That he likes you is very obvious.
2. 连接词whether也不充当句子成分，但有自己的意思，表示“是否”；引导宾语从句时，可换成if，但引导其他名词性从句时不能换成if。
He asked whether （if） I would show him the way.
Whether it will do us harm remains to be seen. （whether引导主语从句，不能用if代替）
3. 连接代词who（m）， whose， which， what，均有各自的意思，在从句中作主语或宾语。如：
That’s what she wanted to get.
What he says is not important.
Tell me which one you like best.
4. 连接副词when， where， why， how也各自有自己的意思，在从句中作状语。如：
The question is how we should carry out the plan.
When she’ll be back depends much on the weather.
Why he did it will remain a puzzle forever.
5. what是一个十分重要的引导词，它可以引导主语从句、宾语从句、表语从句和同位语从句。它引导的名词性从句有两个意思：一是引导宾语从句表示“什么”，带有疑问意味；二是表示“……的”，引导主语从句和表语从句。如：
I don’t know what you want.
I don’t know what you want is this.
That is what I want.
what引导名词性从句时可用作限定词，其后修饰名词，意思是“什么样的……”。如：
I don’t know what books he wants.
What friends he has decides what future he will have.
注：what 后的名词可以是复数名词或不可数名词，但通常不能是单数可数名词。
6. which引导名词性从句时也可用作限定词，其后修饰名词。意思是“哪一个”或“哪一些”。如：
I wonder which book（s） he likes most.
二、主语从句
1. 引导词
主语从句就是在复合句中作主语的从句。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（m）， which， when， where， how， why等。如：
That we shall be late is certain.
How this happened is not clear to anyone.
Which side wins makes no difference to him.
Whether it will do us harm remains to be seen.
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：
It was uncertain whether he could come or not.
三、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（m）， which， when， where， how， why， whether等。如：
My idea is that we should do it right away.
That is what he meant.
The problem is how we can find him.
That’s where you are wrong.
另外，表语从句还可以用as if， as though， because来引导。如：
It is because he is too foolish.
It looks as though/if we will be late.
四、宾语从句
1. 引导词
宾语从句就是在复合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. She has got what she wanted.
I haven’t decided whether I should go.
I asked how he was getting on.
He asked when the train would get in.
He asked me where I was going.
Please tell me which you like.
He asked who lived next door.
She asked why he was silent.
2. if与whether
if通常不用于引导主语从句或表语从句，但可以引导宾语从句。它与whether用法相同，常可互换。如：
I wonder if it’s large enough.
She didn’t say if he was still alive.
但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.
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’t want to know. 她说她不想知道。
I don’t think （that） she’s interested in it. 我想她对这事没有兴趣。
4. 否定转移
当主句主语为第一人称，且主句谓语动词为think， believe， suppose， expect， imagine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 don’t think that he will leave.
I don’t believe that it is easy.
五、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.
句中的that she had just lost her husband是修饰名词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.
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引导，如：
You have no idea how worried I was！
He had no idea why she left.
There is some doubt whether he will come.