名词从句的作用
名词从句是由陈述句和问句变化而来的，和动名词，不定式短语一样，也要视作名词，具有名词的性质。
一.名词从句分类
二.名词从句的作用
I 做主语
Eg.
- That honesty is the best policy is a proverb （which） we should always keep in mind.
- Where he lives is still a doubt .
- Whether he can do it remains to be seen.
名词从句做主语有时会造成主语过长，通常可用代词it代替置于句。而被代替的名词从句置于句尾。因此上面的三个句子可以分别改为：
- It is a proverb we should always keep in mind that honesty is the best policy.
- It is still a doubt where he lives.
- It remains to be seen whether he can do it.
II.做动词宾语
Eg.
- I know that he will go abroad in the nearest future.
- I wonder whether he has finished the work.
- I don’t know how he’ll handle it.
III.做介词宾语
用whether和疑问词引导的名词从句可做宾语，但是that引导的名词从句不能做介词的宾语。
Eg.
- I am worried about whether he can do it.
- I am suspicious of how he’ll cope with the problem.
如果遇到介词，且一定要用that从句的情况，有两种补救办法。
a.介词+the fact+that从句
Eg.
- I am sure of the fact that the team has won the game.
b.保留介词，但不加that，且介词后的that从句做适当变换。
第一步： 除去that
第二步：that之后的主语变成所有格
第三步：动词变成动名词
Eg.
- I am worried about that he plays around all day.(×)
这个句子是错误的，应改为：
I am worried about his playing around all day.（√）
如果that从句里面有助动词do,does,did时，去掉即可。
Eg.
- I am worried about that he doesn’t study.(×)
这个句子错误，应改为：
I am worried about his not studying.（√）
如果that从句里面有助动词will或would，去掉即可，或改为be going to.再将be动词转变成动名词being。
Eg.
- I am sure of that the team will win the game.(×)
这个句子错误，有两种该法：
a.I am sure of the team’s winning the game.（√）
b.I am sure of the team’s being going to win the game.（√）
