eg：The trees near the house, which I planted three years ago, are growing up well.
第四，运用定语从句中的关系代词或关系副词要注意以下几点：
1.介词＋关系词（即关系代词在定语从句中作介词的宾语，如果介词放在关系代词的前面，则关系代词指人只能用whom，指事或物只能用which。）
who is the comrade with whom you shook hands just now?
The boy lives in the house in front of which there is a tall building.
当然，当介词放在从句的句末时，关系代词的用法不受以上限制。
2.关系代词that 可指人也可指物，但在下列情况下一般用that 引导，不用which/who。
1)当先行词为nothing, anything, everything, all, much, little, none, few，等不定代词时常用that，但something可用which。
eg：I can give you all that I can get.
2)当先行词被only, last 等修饰时常用that。
eg：This is the only picture that is inter esting.
3)当先行词被数词、形容词最高级来修饰时常用that，不用which。
eg：That is the longest river that runs through our village.
4)主句中有两个先行词，且一个表示人，另一个表示物，即先行词同时有人或物时常用that。
eg：We talked about the persons and the things that had never happened in school.
人 物
关系代词本身在定语从句中用作表语，用that引导定语从句，但that 常省略。
eg:Our hometown is no longer the place that it used to be.
6)若句中有两个定语从句，前一个定语从句已用了关系代词which，则第二个定语从句中的关系代词常用that。
eg： Edison set up a factory which produced things that had never seen before.
《试论定语从句》出自：www.89xue.com网