高二英语必修知识语法

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(1)表语从句

1. 定义:用作表语的从句叫做表语从句。

2. 构成:关联词+简单句

3. 引导表语从句的关联词的种类:

(1) 从属连词that。如:

The trouble is that I have lost his address. 麻烦是我把他的地址丢了。

(2) 从属连词whether, as, as if。如:

He looked just as he had looked ten years before. 他看起来还与十年前一样。

The question is whether they will be able to help us. 问题是他们是否能帮我们。

注:从属连词if一般不用来引导表语从句,但as if却可引导表语从句,如:

All this was over twenty years ago, but it's as if it was only yesterday.

这都是20多年前的事了,但宛如昨天一样。

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