介词加关系代词（介词加关系代词有几种）

基本要点：

介词放在关系代词前，关系代词指人时用"whom"，不可用"who"或者"that";

指物时用"which"，不能用"that";

(1)The man with whom you talked is my teacher .

(2)I bought many books yesterday, three of which are written by Lu Xun.