With who, whoever, whom, and whomever. Today’s speakers tend not to use whom and whomever, which can create a very formal tone. But for academic and professional writing in which formality is appropriate, remember that problems distinguishing between who and whom occur most often in two situations: when they begin a question, and when they introduce a dependent clause (29c). You can determine whether to use who or whom at the beginning of a question by answering the question using a personal pronoun. If the answer is in the subjective case, use who; if it is in the objective case, use whom.

I visited them. Them is objective, so whom is correct.

I think she wrote the story. She is subjective, so who is correct.

If the pronoun acts as a subject or subject complement in the clause, use who or whoever. If the pronoun acts as an object in the clause, use whom or whomever.

The verb of the clause is wants, and its subject is who.

Whomever is the object of suspected in the clause whomever the party suspected of disloyalty.