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Who and whom are pronouns.
You use who when you are asking about someone's identity. Who can be the subject, object, or complement of a verb. It can also be the object of a preposition.
When who is the object of a verb or preposition, it is followed by an auxiliary verb, the subject, and then the main verb. When who is the object of a preposition, the preposition must go at the end of the clause. Don't use a preposition in front of who.
Whom is a formal word which is sometimes used instead of 'who'. Whom can only be the object of a verb or preposition.
When whom is the object of a preposition, the preposition must go in front of whom. Don't use it at the end of a clause. Don't say, for example 'Whom are they elected by?'
Who is often used in reported clauses.
Who and whom are used in both defining and non-defining relative clauses.
When who is the subject of a non-defining clause, don't use another pronoun after it. Don't say, for example, 'He told his mother, who she was very shocked'. Say 'He told his mother, who was very shocked'.
whom[huːm] PRON (frm)
from whom did you receive it? → ¿de quién lo recibiste?
I know of whom you are talking → sé de quién hablas
the lady whom I saw → la señora a quien or a la cual or a la que vi; (less formal) → la señora que vi
the lady with whom I was talking → la señora con la que or con la cual or con quien hablaba
three policemen, none of whom wore a helmet → tres policías, ninguno de los cuales llevaba casco
three policemen, two of whom were drunk → tres policías, dos de los cuales estaban borrachos
three policemen, all of whom were drunk → tres policías, que estaban todos borrachos who, whom
Whom did you see? → Qui avez-vous vu?
To whom did you give it?
BUT À qui l'avez-vous donné?.
the man whom I saw → l'homme que j'ai vu
the woman whom I saw → la femme que j'ai vue