For Who Versus for Whom?

When in doubt, try this simple trick: If you can replace the word with “he”' or “'she,” use who. If you can replace it with “him” or “her,” use whom. Who should be used to refer to the subject of a sentence. Whom should be used to refer to the object of a verb or preposition.

What is the rule for who and whom?

Rule #1: Substitute “he/him” or “she/her”: If it's either “he” or “she,” then it's “who;” if it's “him” or “her,” then it's “whom.” “he” (whoever) is the subject of the verb “called.” In the sentence, “Give it to whoever deserves it”:([You] give it to whoever deserves it.)

What answers the question to whom or for whom?

Here's the deal: If you need a subject (someone doing the action or someone in the state of being described in the sentence), who is your pronoun. If you need an object (a receiver of the action), go with whom. A good trick is to see if you can substitute the words he or she or they. If so, go with who.