Whom
The pronoun who, in English, is an interrogative pronoun and a relative pronoun, used chiefly to refer to humans.
Its derived forms include whom, an objective form the use of which is now generally confined to formal English; the possessive form whose; and the emphatic form whoever (also whosoever and whom(so)ever; see also -ever).
Who (pronoun)
What person or people; which person or people; asks for the identity of someone. (used in a direct or indirect question)
“Who is that? (direct question)”
“I don’t know who it is. (indirect question)”
Who (pronoun)
What is one’s position; asks whether someone deserves to say or do something.
“I don’t like what you did, but who am I to criticize you? I’ve done worse.”
Who (pronoun)
The person or people that.
“It was a nice man who helped us.”
Who (pronoun)
Whoever, he who, they who.
Who (noun)
A person under discussion; a question of which person.
Whom (pronoun)
What person or people; which person or people, as the object of a verb.
“Whom did you ask?”
Whom (pronoun)
What person or people; which person or people, as the object of a preposition.
“To whom are you referring?”
“With whom were you talking?”
Whom (pronoun)
Him; her; them (used as a relative pronoun to refer to a previously mentioned person or people.)
“He’s a person with whom I work.;”
“We have ten employees, half of whom are carpenters.”
Who (pronoun)
what or which person or people
“I wonder who that letter was from”
“who is that woman?”
Who (pronoun)
used to introduce a clause giving further information about a person or people previously mentioned
“Joan Fontaine plays the mouse who married the playboy”
Who (pronoun)
the person that; whoever
“who holds the sea, perforce doth hold the land”
Whom (pronoun)
used instead of ‘who’ as the object of a verb or preposition
“her mother, in whom she confided, said it wasn’t easy for her”
“whom did he marry?”