whom/huːm/

1.pronoun [frm] 
(interrogative) 谁

2.pronoun [frm] 
(relative) 所…的那个…

whom did you see?
你见到谁了?
to whom did you give it?
你把它给谁了?
tell me from whom you received it
告诉我你从谁那儿得来的
the man whom I saw/to whom I spoke
我见到的/我跟他说过话的那个男的
her brother, whom you've met, is a gifted pianist
你所见过的她哥哥,是位有天赋的钢琴家