介词+whom，介词+which的用法

who可以带人（即他的先行词必须是人），在从句中可以做主语，往往也可以代替在从句中代替宾格的whom，但他的前边不能有介词 如果用带介词必须用whom(如果表示某人的 则用whose） 即prep+whom

举个例子：

She is the girl whom I went there 她就是和我一起去那的女孩

This the hero of whom we are proud 这就是我们引以为荣的英雄

注：有些有v+prep组成的短语 关系非常紧密 prep不能前置

介词 in, on, at, for 等与关系代词 which 一起引导定语从句时，可与相关的关系副词 when, where, why 等替换 如why = for+which, when = on / at / in / ... + which,where = at / on / in / ... + which

又如：The reason for which he refused to go to the party was that they had not invited him to. 他拒绝去赴宴的原因是他没受到他们的邀请

America is the country in which George Washington was born. 美国是乔治·华盛顿出生的国家