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名词性从句
一、在四六级语法中，名词或名词短语主要充当四种成分，主语、宾语、表语和同位语。如果我们把句子当作名词来使用，分别在另一个句子中作主语、宾语、表语和同位语(见下表第二列)，于是就构成了四种从句：主语从句、宾语从句、表语从句和同位语从句。因为以为这四种从句在本质上相当于名词的作用，所以我们把他们统称为名词从句。请看真题例句：
简单句
名词从句
“Jane Eyre” is great.
What I am reading is great.
I believe his words.
I believe what he said.
French is a useful tool.
This BMW is what I want.
I like the car, Porsche.
The mother must accept the fact that her baby is deaf.
二、三种句子来充当四种成分(3，4)
上面说到名词从句就是用一个完整句子充当另一个句子的某种句子成分便构成了具体某一名词从句。
那么可以用什么样的句子来充当四种成分呢?答案是：
陈述句
Stuart is fat.
一般疑问句
Does he eat more everyday?
特殊疑问句
How much does he eat at home?
三、陈述句可分别充当四种句子成分(名词从句的重点内容)，要在陈述句首加上他that
对于陈述句，我们要在句首加上that,然后把“that+陈述句”分别放在另一个句子的四种位置即构成四种名词从句。
1.主语从句。“that+陈述句”在主语位置即成主语从句：
Stuart is ugly. 外语教育%网www.exam8.com
That Stuart is ugly is a fact..
That Malaysians don’t speak good English is obvious.
更常见的是用it式主语置于句首，而将主语从句放在句末。例如：
It is a fact that Stuart is ugly.
It is obvious that Malaysians don’t speak good English。
因此下面都是常见的主语从句句型：(￥)
①It is +过去分词 +that 从句(found, believed, reported, thought, noted…)
②It is +形容词 +that 从句(clear, possible, likely, natural, certain, fortunate, necessary, strange…)
③It is +名词(短语) +that 从句(a pity, a shame, an honor, a good idea, a miracle…)
2. 宾语从句。“that+陈述句”在宾语位置即成宾语从句：