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English definition of “whom”

whom

pronoun     /huːm/ formal
B2 used instead of 'who' as the object of a verb or preposition: I met a man with whom I used to work. He took out a photo of his son, whom he adores. There were 500 passengers, of whom 121 drowned. To whom do you wish to speak?Relative forms Grammar:Questions: interrogative pronouns (what, who)We use interrogative pronouns to ask questions. They are: who, which, whom, what and whose. These are also known as wh-words. Questions using these are called wh-questions:See moreGrammar:Interrogative pronouns: usesWe use who and whom on their own:See moreGrammar:Relative pronounsRelative pronouns introduce relative clauses. The most common relative pronouns are who, whom, whose, which, that. The relative pronoun we use depends on what we are referring to and the type of relative clause.See moreGrammar:Relative pronouns: whomSee moreGrammar:No relative pronounIn informal styles, we often leave out the relative pronoun. We only do this in defining relative clauses, and when the relative pronoun is the object of the verb. We don’t leave out the relative pronoun when it is the subject of the verb nor in non-defining relative clauses:See moreGrammar:Relative pronouns: typical errorsSee moreGrammar:Who, whomWho and whom are wh-words. We use them to ask questions and to introduce relative clauses.See moreGrammar:Who as a question wordWe use who as an interrogative pronoun to begin questions about people:See moreGrammar:Emphatic questions with whoever and who on earthWe can ask emphatic questions using whoever or who on earth to express shock or surprise. We stress ever and earth:See moreGrammar:Who in relative clausesWe use who as a relative pronoun to introduce a relative clause about people:See moreGrammar:WhomWhom is the object form of who. We use whom to refer to people in formal styles or in writing, when the person is the object of the verb. We don’t use it very often and we use it more commonly in writing than in speaking.See more
(Definition of whom pronoun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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