在句子中起名词作用的句子叫名词性从句 (Noun Clauses）。 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，因此根据它在句中不同的语法功能，名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。墨尔本文波雅思就给大家系统讲解一下名词性从句。
国外烤鸭看这里：
国内烤鸭看这里：
1.定义：在句子中起名词作用的句子叫名词从句 (Noun Clauses）。
2.分类：
主语从句
宾语从句
表语从句
同位语从句
3.本质 —-三种句子充当四种成分
三种句子如何充当四种成分的？
罗伯特矮是真的
Robert is short is true.
一个简单句只有一个谓语。
That Robert is short is true.
主语从句
That Robert is short is true.
头重脚轻
It is true that Robert is short .
主语从句常见结构
It is +形容词 +that 从句
（clear, possible, likely, natural, certain, fortunate, necessary, strange…
It is +名词（短语） +that 从句
（a pity, a shame, an honor, a good idea, a miracle…）
It is +过去分词 +that 从句
（found, believed, reported, thought…
翻译练习：
Furthermore, it is obvious that strength of a country’s economy is directly bound up with the efficiency of its agriculture and industry, and that this in turn rests upon the efforts of scientists and technologists of all kinds.
It is true that the American intellectual is rejected and considered of no account in his society?
1.陈述句充当四种成分(句首加that)
1.1.主语：That Robert is short is true.
1.2.宾语:
I know that Robert is short.
1.3.表语:
The fact is that Robert is short.
1.4.同位语:
I know the fact that Robert is short .
2.一般疑问句充当四种成分
a.用whether或if引导。
b.一般疑问句语序变成陈述语序。
2.1.一般疑问句充当主语
Robert矮不矮不重要。
Whether Robert is short or not is not important.
2.2.一般疑问句充当宾语
我不知道Robert矮不矮。
I don’t know whether/if Robert is short.
2.3.一般疑问句充当表语
我的问题是他矮不矮。
My question is whether Robert is short or not.
2.4.一般疑问句充当同位语
我有一个问题就是Robert矮不矮。
I have a question whether Robert is short or not.
3.特殊疑问句别充当四种句子成分
3.1特殊疑问句充当主语
为什么罗伯特矮,这还没人知道。。
Why is Robert short is unknown.
特殊疑问句变成陈述句语序
Why Robert is short is unknown.
3.2特殊疑问句充当宾语
I don’t know why is Robert short.
I don’t know why Robert is short.
3.3特殊疑问句充当表语
My question is that why is Robert short.
My question is why Robert is short.
3.4特殊疑问句充当同位语
I have a question why Robert is short.
温故知新
名词从句就是用三种句子来分别充当另外一个句子的四种句子成分。
三种句子：
四种成分：
注意事项
三种句子不是直接放在另个句子中作成分，而是要做以下调整：
用陈述句作成分时，要在句首加that。
用一般问句作成分时，先将疑问句换语序，然后在句首加whether/if。
用特殊问句作成分时，只需将疑问句换语序
墨尔本文波雅思出品
