This is the house in which I lived two years ago.
This is the house where I lived two years ago. 这是我两年前住过的房子。
Do you remember the day on which you joined our club?
Do you remember the day when you joined our club?
还记得你加入我们俱乐部的那一天吗？
This is the reason for which he was put in prison.
This is the reason why he was put in prison. 这就是他为什么被关起来的原因。
4、介词＋which(指物)/whom（指人）在定语从句中作地 点状语，表示存在关系，关系分句主谓常须倒置。例如：
They arrived at a small house, in front of which sat a small boy.
他们来到一家农舍，前边坐着一个小男孩。
I saw a man, on the head of whom stood a bird.
我看到一个人，他头上站着一只鸟。
5、不定代词或数词＋of+which/whom,在关系分句中作主语，说明整体中的部分。例如：Tom has three
