1、非限制性定语从句
引导非限制性定语从句时，通常要用which，不用that：
The current, which is very rapid, makes the river dangerous.
水流湍急，使这条河很危险。
He has to work on Sundays, which he doesn’t like.
他得在星期天工作，他是不喜欢这样的。
2、介词作宾语
直接放在介词后作宾语时，通常要用which：
She may be late, in which case we ought to wait for her.
她可能晚到，那样我们就要等等她。
The documents for which they were searching have been recovered.
他们找寻的文件已找到了。
This morning some port wine came, for which I have to thank you.
今天早上送来一些波尔图葡萄酒，为此我得向你道谢。
注：有时“介词+which”引导的定语从句可以转换成“介词+which+不定式”结构：
He had only the long nights in which he could study. =He had only the long nights in which to study.
他只有漫漫长夜可用来学习。
He had a couple of revolvers with which he could defend himself.= He had a couple of revolvers with which to defend himself.
他只有一两把手枪用来自卫。
3、先行词
当先行词是下列不定代词或被它们修饰时much, little, none, all, few, every(thing), any(thing), no(thing) 等时，通常用that：
All that she lacked was training.
她缺的只是训练。
Have you everything that you need?
你需要的东西都有了吗?
The sleeping man’s subconscious mind retained everything that was said around him.
这位酣睡的人头脑的下意识能记住他周围的人说的话。
She would never do anything that was not approved of by her parents.
她父母不赞同的事她绝不会做。
