介詞whom等於啥

介詞加關係代詞結構引導的定語從句中，關係代詞只能用which指物或whom指人，當介詞放在關係代詞的前面時，用在介詞後的關係代詞是不能省略的。

1、The man whom you spoke to is a teacher

也可以寫成

The man to whom you spoke is a teacher.

I will never forget the day on which I came to this school.