定语从句中，介词+which 中的介词有for、in、on、at、of、to、with等等。在定语从句中，介词+which的结构一般充当关系副词。定语从句，一个简单句跟在一名词或代词后（先行词）进行修饰限定，就叫做定语从句。在主句中充当定语成分。关系副词有三个作用：
①连接主语和从句。
②指代先行词。
③在定语从句中充当状语。关系副词主要有：why、where、when。①why=for which，主要用于修饰表原因的名词（主要是the reason），同时它在定语从句中用作原因状语。例如：We don’t know the reason why he didn’t show up=We don’t know the reason for which he didn’t show up.②where=in/ at/ on which，主要用于修饰表地点的名词，同时它在定语从句中用作地点状语。。例如：This is the village where he lived=This is the village in which he lived.③when=during/ on/ in which，主要用于修饰表时间的名词，同时它在定语从句中用作时间状语。
常见的英语中的介词有：at, after, by, before, in, to, on, for, through, beside, behind, near, under……, 定语从句中，介词+which中的介词，前面这些常见的介词都可以。例句：
1.There is a house beside the road, the wondows of which are broken.
2.There is a hole in the wall, through which he can see everything outside the house.
3.This is an old farm, on which he worked for three years.
