What's the difference between the words "Who" and "Whom"?

Question

I need to know the difference between who and whom for our writing finals..

Answer 1

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you use "whom" with a preposition.

to whom, with whom,

Who do you know?
To whom do you want to know?

You will be going with whom?
Who are you going with?

The book was written by whom?
Who wrote the book?

Hope this helps!

Answer 2

whom is used for plurals

Answer 3

WHOM -- –pronoun

1. the objective case of who: Whom did you call? Of whom are you speaking? With whom did you stay?

2. the dative case of who: You gave whom the book?

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WHO -- –pronoun; possessive whose; objective whom.

1. what person or persons?: Who did it?

2. (of a person) of what character, origin, position, importance, etc.: Who does she think she is?

3. the person that or any person that (used relatively to represent a specified or implied antecedent): It was who you thought.

4. (used relatively in restrictive and nonrestrictive clauses to represent a specified antecedent, the antecedent being a person or sometimes an animal or personified thing): Any kid who wants to can learn to swim.

5. Archaic. the person or persons who.
—Idiom6. as who should say, Archaic. in a manner of speaking; so to say.

Source(s):

dictionary.com