在句子中起状语作用的从句叫做状语从句。状语从句由从属连词引导。

状语从句可分为：

时间状语从句：

When Susan goes to town, she will visit her grandma.

苏珊每次进城，总要去看望她奶奶。

地点状语从句：

I will go where I am needed.

哪里需要我，我就到哪里去。

方式状语从句：

I have changed it as you suggest.

我已经按照你的建议作了改变。

原因状语从句：

Mary didn't go shopping because I advised her not to.

玛丽没有去购物，因为我劝她不要去。

目的状语从句：

They worked hard in order that they might succeed.

他们努力工作，以便能够获得成功。

结果状语从句：

Waste must be treated so that it does not become a danger to life.

废物必须进行处理，这样它才不会成为危害生命的东西。

条件状语从句：

If he works hard, he will surely succeed.

如果努力工作，他肯定会成功。

让步状语从句：

Though we are all different, we need never be separate.

虽然我们各不相同，但是我们永远也不会分开。

比较状语从句：

I was happier than I had ever been in my life.

这是我一生中最快乐的时光。