When do you use who and when do you use whom? The addition of one letter, m, can drastically change the usage of these words. Here are some quick tips to help you use the two correctly:
Who is used normally as the one who does the action. Think of your reply as an answer to a question.
For example: Who sent the memo? I am the one who wrote and sent the memo.
Whom is the one normally receiving that action. Think again of this in the format of a question.
For example, it’s not “who do I give this memo to,” it’s “to whom do I give this memo?”
If you can replace “it” with “he” or “she,” you should use who. “He wrote the memo.”
If you can replace “it” with “him” or “her,” use whom. “Give the memo to him.”
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