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English definition of “who”

who

pronoun (QUESTIONS)    /huː/
A1 used especially in questions as the subject or object of a verb , when asking which person or people , or when asking what someone's name is: Who did this? Who's she? Who are all those people ? She asked me if I knew who had got the job . Who (also formal whom) do you want to talk to? I don't know who to ask to the party .Question words and expressions used with verbs that relate to knowing , when you want to say that something is not known : "Are they going to get married ?" "Who knows ?" (= It is not possible to know at the moment .) Who can tell what will happen now?Question words and expressions 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:Grammar:Interrogative pronouns: usesWe use who and whom on their own:Grammar:Who, whomWho and whom are wh-words. We use them to ask questions and to introduce relative clauses.Grammar:Who as a question wordWe use who as an interrogative pronoun to begin questions about people:Grammar: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:Grammar:Who in relative clausesWe use who as a relative pronoun to introduce a relative clause about people:Grammar: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.
(Definition of who pronoun (QUESTIONS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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