结果状语从句：结果状语从句常由so...that 或 such...that引导，要掌握和区分这两个句型，首先要了解so和such后面分别跟什么词。such是形容词，修饰名词或名词词组，so是副词,只能修饰形容词或副词。so 还可与表示数量的形容词many, few, much, little连用，形成固定搭配。
如：The box is so heavy that I can't carry it.

让步状语从句：是由though, although 引导的状语从句。

 

表示目的状语的从句可以由that（以便）, so that（以便）, in order that（为了；以便），Lest（免得；唯恐）, fear that（生怕；以免）, in case（万一）等词引导，例如：
You must speak louder so that /in order that you can be heard by all.
He wrote the name down for fear that(lest) he should forget it.
Better take more clothes in case the weather is cold.
　　 
Say it louder(so)that everyone can hear you.

大声说，以便大家都能听到你。

I am telling you that lest you should make a mistake.

我告诉你这一点，以免你搞错。

学习目的状语从句应注意以下两点：

（1）目的状语从句中的谓语动词常用 may（might），can（could），should等情态动词。

I got up early so that I could catch the first bus.

我起得很早，目的是为了赶上头班公共汽车。

（2）在口语中so可以引导目的状语从句。

We'll sit nearer the front so we can hear better.

我们坐的靠前一点，因此，我们听得清楚一点。