可用分词、独立结构来代替：

As he is honest (Being honest), he is liked by all his friends.

There being no buses, we had to walk home.

Being ill, she couldn't come to school.

Weather being so fine, we have decided to go hunting.

4.目的状语从句

用so that, in order that, for fear that, in case引导,谓语一般用

can, could, may, might, will, would, should等：

He started early so that he could catch the train.

可用in order to, so as to 引导的不定式来代替：

He started early in order to (so as to) catch the train.

5.结果状语从句

由so...that, such...that引导：

We left in such a hurry that we forgot to lock the door.

He started so early that he caught the train.

比较下列句子：

It is such a good book as everyone likes to read.

(句中as引导的是定语从句,as做read的宾语。)

6.条件状语从句

由if, unless, as (so) long as, on condition that 引导。一般不用将

来时，而用一般时代替：

As long as we don't lose heart, we'll find a way to overcome the

difficulty.

The doctor won't operate on him unless it is necessary.

【注意】

(1)will用作情态动词，用于条件句中，意为"愿意"。

If you will wait a while, I'll call the manager.

(2)表达条件状语有多种形式。例如：

If you work hard, you'll succeed.

努力学习,你就会成功。

可用下列不同形式表达:

Working hard, you'll succeed.

Work hard and you'll succeed.

(3)条件句的省略：

If heated, water can be changed into vapor.

相当于:If it is heated, water can be changed into vapor.

7.比较状语从句

由than, as引导。

He is not so clever as you.