When do you use whom instead of who in a sentence?

Answer by  June77 (292)

Who is used for the nominative case, and whom is used for the objective case. For example, you would say "Who is going?" because who is a subject, and that is a nominative use. You would say "Whom will Todd see there?" because whom is an object (the subject is actually Todd).

Answer by  owlie (231)

"Whom" is used when it serves as the object of a sentence, or the object of a preposition. For instance, "You gave the ball to whom?" or "You gave whom the ball?" are both correct. "Who" is used when it is the subject of the sentence, such as "Who gave him the ball?"

Answer by  jclick (1561)

A good tip for remembering when to use "whom" instead of who is if you can substitute "him" in the sentence or question, then you should use "whom".