2、　 先行词为表示人的名词或者代词时，限制性定语从句由关系代词who或者that引导；先行词为表示物的名词或者代词时，限制性定语从句由关系代词which或者that引导(先行词为表示物的不定代词时，限制性定语从句由关系代词that引导); 先行词既有表示人又有表示物的词时，限制性定语从句由关系代词that引导。

1、　 定语从句紧跟先行词；

6.　　　 He couldn’t finish the work on time if you didn’t help him.

He couldn’t finish the work on time without your help.

Part Three：定语从句

主要考查由关系代词who, that, which引导的限制性定语从句以及由关系代词who, which引导的非限制性定语从句。使用时注意以下规则：

5.　　　 He made great progress because you helped him.

He made great progress with your help.

4.　　　 It’s a long time since we met last.

We haven’t seen each other for a long time.

3.　　　 If you stand at a higher place, you’ll see far away.

Stand at a higher place, and you’ll see far away.

2.　　　 The dress was so expensive that I didn’t have enough money to buy it.

The dress was too expensive for me to buy.

1.　　　 When he was fifteen years old, Tom left his hometown.

Tom left his hometown at the age of fifteen.

3、让步状语从句：表示语意的转折，可由(even) though/although来引导，意思为“虽然---但是---”，though/although与but不可以同时出现在一个句中。使用时注意主从句时态一致。

时间状语从句：有由as soon as, when/while, before, after, since, until等引导的时间状语从句, 使用时注意主从句时态一致。

在句型转换题型中, 常见将状语从句转换成用介词短语或其他简单句来代替的同义转换句。例如：

2、目的/结果状语从句与原因状语从句：有因就有果。表原因时可用because来引导，表结果时可用so that或者so/such---that-clause来引导。但because 与so/so that不可以同时出现在一个句中。使用时注意主从句时态一致。