表示目的狀語的從句可以由that， so that， in order that， lest， for fear that， in case等詞引導。例如：

You must speak louder so that /in order that you can be heard by all. 你必須大點聲，別人就能聽見了。

He wrote the name down for fear that(lest) he should forget it. 他寫下了這個名字以免以后忘記。

Better take more clothes in case the weather is cold. 最好多穿點衣服，以防天發冷。