(3)that，if，whether引导宾语从句。that没有实际意义，可以省略；if和whether表示"是否"，不能省略。

He asked me whether she was coming.

他问我她来还是不来。

(4)it作形式宾语，而将宾语从句置于后面，这类动词有find，feel，consider，make，believe，hate，take，owe，have等。

I have made it a rule that I run for 2 kilometers every morning.

我已经养成习惯，每天早晨跑2公里。

(5)介词后接宾语从句。

The new book is about how tomatoes are planted.

这本新书是关于怎样种植西红柿的。

(6)在某些形容词后也可接宾语从句。

I was surprised that my friend hadn't passed the exam.我很惊讶我的朋友没有通过考试。

(7)表示"命令、建议、意志、要求(如：command, order, suggest, advise, insist, desire, demand, require, request)"等动词，后面跟宾语从句时，从句谓语必须用should do，should可省略。

The commander ordered that troops (should) set off at once. 司令命令部队即刻出发。

[题组训练2]

单句语法填空

(1)He has told me he will go to Shanghai tomorrow.

(2)She will give needs help a warm support.

(3)I think it necessary we take plenty of hot water every day.

(4)She always thinks of she can work well.

(5)I hate it they talk with their mouths full of food.

(6)The teacher suggested that I (recite) this passage.

3.表语从句

在复合句中起表语作用的从句叫表语从句。表语从句通常位于连系动词的后面。

(1)that引导表语从句，表示一件事情，that只起到连接作用，不作任何成分，但是不能省略。

The problem is that I have lost my key to my house.

问题是我弄丢了家里的钥匙。

(2)what常引导表语从句。

My hometown is not what it was ten years ago.

我的家乡已经不是十年前的样子了。

(3)where，why，when，because，how，whether等引导表语从句。

This is where I worked with my parents one year ago.

这是我一年前和父母劳动的地方。