Grammarly gave the following rules that will help us learn how to use who and whom properly.
In a sentence, who is used as a subject. Let’s look at a couple of examples:
Who would like to go on vacation?
Who made these awesome quesadillas?
Whom is used as the object of a verb or preposition. Consider these examples:
To whom was the letter addressed?
Whom do you believe?I do not know with whom I will go to the prom.
THE DIFFERENCE BETWEEN WHO AND WHOM
How can you tell when your pronoun is the object of a verb or preposition? Try substituting “he” or “she” and “him” or “her.” If “he” or “she” fits, you should use who. If “him” or “her” fits, you should usewhom. Keep in mind that you may have to temporarily rearrange the sentence a bit while you test it.
Who/Whom ate my sandwich?
Whom ate my sandwich?- INCORRECT
Who ate my sandwich?- CORRECT
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