新概念英语第二册语法精解：名词性从句之主语从句_新概念英语第二册

It is demanded that he (should) leave at once.

(4) It + seem/happen/appear等不及物动词 + that从句。(look不接that从句，它接to be结构或形容词)

It seems that he is wrong.

It appears that they are in urgent need of help.

He looks (to be) surprised/happy/sad.

2. whether引导主语从句，意为“是否”，只起连接作用，不充当任何成分。(置于句首时必须用whether引导，置于句尾时，间或可用if。)

Whether he will win the game is not clear.

Whether he will come is uncertain.

Whether she comes or not doesn't concern me.

It is not clear whether/if he will come.

It was uncertain whether he would come.

3. 连词代词what, who, which, whose等引导的主语从句。这些连接代词作用相当于代词，在从句中担当主语、宾语、表语、定语等。

What we need is more time.

Who was responsible for the accident is not yet clear.

Whose book it is not important.

Which school you want to go matters much.

4.连接副词when, where, why, how引导的主语从句。这些连接副词相当于副词，在从句中充当状语。

Why he did this is not known.

When he will come is still unknown.

【新概念英语第二册语法精解：名词性从句之主语从句】相关文章：

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新概念英语第二册 最新: 请求允许
2016-09-20; 劝告和建议
2016-09-20; 新概念英语第二册语法汇总：过去完成进行时
2016-06-20; 新概念英语第二册语法汇总：将来完成时
2016-06-20; 新概念英语第二册语法汇总：名词
2016-06-20; 新概念英语第二册语法汇总：被动语态
2016-06-20

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