“WORD WAR” time with Cac The Proofreader! The is a BIG one for so many people, and I’m here to clarify it for you. Let’s just dive right in, shall we?
WHO vs. WHOM.
WHO is used as the subject of a sentence. Here’s a great trick: if you can replace the words “he” or “she,” then use “WHO.” Example: Who is going with me? Now turn that question around and say “He is going with me.” Not “Him is going with me.” One makes total sense; the other, not so much.
WHOM should be used to refer to the object of a verb or preposition. A trick here: If you can replace the “WHOM” with “him” or “her,” then use ‘WHOM.” Example: “Whom should I talk to about this?” Turn that around and say “I should talk to her.” Not “I should talk to “he” or “she.” Can’t remember which word you should substitute for the usage test? Check this out: “him” contains an “m.” So does “whom.” So that’s what you would use when you get REALLY confused, i.e., does the sentence make sense with “him” or “her” or “he” or “she?”
And there you have it. EZ PZ!!!
Plaisted Publishing 
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