名词性从句
一. 什么是名词性从句？
在主句充当名词通常能够充当成分的从句，叫名词性从句。
主语从句，宾语从句，表语从句，同位语从句。
What I need is a new desk.
He said that he will leave for Beijing next week.
His question is when the sports meet will take place.
He told me a lie that he had learned five foreign languages.
从以上例句中，可以看出名词性从句没有先行词。同位语从句的情况待后面解释。不同的从句在以后的讲解中我们会逐渐熟悉。
二．连接词。
1.That 不充当任何成分，没有任何意思，只起连接作用。
发生了这场事故是你的错。
That the accident happened is your fault.
I had no idea that you were here.
2.whether, if ( 不做句子成分，有意思，有连接作用 )
The question is whether the book is worth reading.
Whether the pollution can be controlled depends on the effect we will make.
以上两句不能用if代替whether.
If 只能用于宾语从句，但不能用于介词宾语从句。
He didn’t make sure if (whether)he would take part in the party.
Everything depends on whether we have enough experience.
3.连接代词或连接副词（所有疑问代词和疑问副词都可以转为连接代词或连接副词）
（做句子成分，有意思，有连接作用。）
Where they will make the experiment is twenty miles away from the city.
Who will be the conductor has not been decided.
三．需要注意的情况。
1. what
What he says is different from what he does.
What he left me is an expensive pen.
What he left me are a few old books.
2. whoever, whatever
Whoever borrowed books from the library must return
(Anyone who)
them on time.
They gave a present to whoever attended the meeting.
(everyone who)
Take whatever you want.
Each of us should do whatever work fit for his brains and ability.
3. 形式主语。
1) It is said that ….
It is reported that…
It is thought that …
It has not been decided that / when…
2) It is important that…
It is necessary that…
It is strange that…
3) It is a pity that…
It is an honour that…
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