who

  • pronoun 1 what or which person or people? 2 introducing a clause giving further information about a person or people previously mentioned.

  — USAGE According to formal grammar, who is used as the subject of a verb (who decided this?) and whom is used as the object of a verb or preposition (to whom do you wish to speak?). However, in modern English who is often used instead of whom, as in who should we support? and most people consider this to be acceptable.

  — ORIGIN Old English.

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