Both who and whom are pronouns. Use who when you are referring to the subject of a clause and whom when you are referring to the object.
Who wants to learn how to use proper grammar?
I wish I knew who took the last piece of cake.
From whom did you borrow that sweater?
Whom do you love the most?
Still unsure? Use whom whenever the answer to your question is “him”, i.e. You took it from “whom”? Use who whenever the answer to your questions is “he”, i.e. “Who” took my pencil?
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