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Guest Posted 22 years ago
Grammar

Who vs. Whom

When is it appropriate to use whom instead of who?
  

Top answer

'whom' usage

  • 'whom' usage
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4 Answers
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Quick answer: It is appropriate to use "whom" in formal writing after these words (prepositions):

to, from, with, without, among, for, in, by, on, ... (and all other prepositions)

There are other cases when "whom" is appropriate, but that means a very long answer. See the links suggested for more details.
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by whom is it correct?
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Yes. by is a preposition. Any preposition followed by whom is correct.
by whom, to whom, for whom, with whom, etc.
CJ

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