pron. The objective case of who. See Who.
pron. 谁
1. I spoke to the teacher, whom I respect very much.
我和老师交谈了，我非常尊敬他。
2. She is the person whom you should ask for help.
她是你应该寻求帮助的人。
3. Do you know whom he invited to the party?
你知道他邀请了谁参加派对吗？