1. 宾语从句：一般疑问句做宾语，引入if或whether

　　例句： I want to know if he will join us in the discussion?

　　2. 原因状语从句：since引导的

　　例句： Don’t eat too much sugar since it is bad for your health.

　　3. 否定词前置倒装：scarcely...when...

　　例句： Scarcely had he arrived at home when it began to rain.

　　4. If虚拟条件句

　　5. 宾语从句：放在介词后面，作介词的宾语。

　　例句：I know nothing about him except that he used to work in Shanghai.

　　6.状语从句省略(分词作状语)：从句的主语和状语从句的主语一致，状从省略采用分词作状语。例句：

　　(Because) being short of money, we can’t afford a TV set. =Because we are short of money, we can’t afford a TV set.