首先whom要在定语从句中做宾语,记住这点就好了
I live with Jim. Jim is cute.
Jim whom I live with is cute.能不能再举个例子在介词后面的谢谢了什么在介词后面？

I don’t like thatman.
That man is a doctor.
That man whom I don't like is a doctor.就是好像介词后面只能用whom不用who就是好像介词后面只能用whom不用who这两个例子都只能用whom，因为Jim 跟That man都是在从句中做宾语。介词后面都是用宾格，所以不能用who。