介词whom等于啥

介词加关系代词结构引导的定语从句中，关系代词只能用which指物或whom指人，当介词放在关系代词的前面时，用在介词后的关系代词是不能省略的。

1、The man whom you spoke to is a teacher

也可以写成

The man to whom you spoke is a teacher.

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