高中英语语法简明讲义,简明列出个语法的注意点,对于应试生而言是非常有用的语法补习课!

名词性从句

1. 主语从句

主语从句在复合句中作主语，它的位置与陈述句基本结构中的主语相同。引导主语从句的有连词that, whether; 连接代词who, what, which, whom, whose, whoever, whatever; 连接副词when, whenever, where, wherever, how, why等

That light travels in straight lines is known to all.

Whether she will come is still a problem.

What I want is only a picture.

How he has made such rapid progress is of great interest to us all.

主语从句置于句首，句子常显得“头重脚轻”。因此，一般用引导词“it”作形式主语，而将从句置于句末，以保持句子平衡。

It is strange that he should leave without saying good-bye.

It wasn’t quite clear why she did it.

a) 连词that 本身无意义，在主语从句中不充当任何成分，但不可以省略。 b) 引导主语从句的whether不可用if 替代

2. 宾语从句

宾语从句在复合句中作宾语，引导宾语从句的有连词that, if, whether；连接代词who, whom, whose, what, which, how, why等。宾语从句一般位于主句谓语动词（及物动词）或介词之后。

1) 动词宾语

We all know (that) Miss Lin will teach us physics next term.

I couldn’t tell who was right at the moment.

The man asked him whether/if he had made up his mind.

当宾语从句（通常是that引导的宾语从句）有一宾语补足语时，常用“it”作形式宾语，而将宾语从句置于句末。例如：

We have made it clear that we should stick to the principle.

He thinks it important that a doctor should be patient with his patients.

2) 介词宾语

I was surprised at what I saw.

They are discussing about whether they should have a class meeting.

3) 形容词的宾语

I’m afraid (that) you did it for nothing.

I’m not sure if/whether they have got a solution.

宾语从句的时态与逐句的时态应保持一致。但是，从句的谓语动词如果表示的是客观真理或不变的事实，从句的谓语动词则保持一般现在时。

The teacher told us (that) the earth goes round the sun.

Didn’t you know (that) one plus one is two?

连词that在宾语从句中无意义，不充当任何成分。

3. 表语从句

表语从句在复合句中作表语，置于连系动词后面。引导表语从句的有连词that, whether, as if; 连接代词who, what, which; 连接副词when, why, where, how等。

Is that what you want to know?

He is not what he used to be.

The question is whether it is worth doing.