whom
01
誰を, 誰に
used to ask questions about objects or indirect objects in sentences
例
Whom did you invite to the party?
パーティーに誰を招待しましたか？
02
誰を, その人
used to refer to people in formal English, particularly when they are the object of a verb or preposition
例
He is the professor whom I admire for his knowledge and teaching skills.
彼は、知識と教育スキルで私が尊敬している教授です。
03
誰を, その人
used to represent the person who receives the action of the verb in the relative clause as the subject or object of verb or preposition
例
Whom I met yesterday is a very important man.
昨日会った人はとても重要な人です。
