請問幾時用who whoes whom?

who(誰人)~等同代名詞中的subject
eg. who is your class teacher?
Miss Lee is my class teacher.

whose(誰人的)~等同代名詞中的possesive adjective
eg. Whose book is this?
This is Miss Lee's book.

Whom(誰人)~等同代名詞中的object
eg. Whom do you go to school with?
I go to school with Jack.

thx....

who
pron.
誰, 那...的(人)
e.g.:
Who breaks pays.
損壞者要賠。

whose
pron.
誰的, 那(些)人的
e.g.:
Tell me whose it was.
告訴我這是誰的。

whom
pron.
誰
e.g.:
That is the man whom I met in Beijing last year.
他就是我去年在北京碰見的那個人。