"Who's sweater is that?" or "Whose sweater is that?"

Hey, both are realistic scenarios in my world. "Whom" is a little trickier. It's usually used to describe someone who's receiving something, like a letter -- "To whom will it be addressed?" But it can also be used to describe someone on the receiving end of an action, like in this sentence: Whom did we hire to join the podcast team? "Whose" is used to assign ownership to someone. See if you can spot the error in this question: Who's sweater is that? Because the sweater belongs to someone, it should actually be written this way: Whose sweater is that? "Who's," on the other hand, is used to identify a living being. It's a contraction for "who is" -- here's an example of how we might use it in a sentence here in Boston: Who's pitching for the Red Sox tonight? See the difference? "Whose" is used to figure out who something belongs to, whereas "who's" is used to identify someone who's doing something.

whose. Too bad both words sound the same ;)