This tip is a problem I see quite often. Here’s a quick  way to know which to use, and when.

Who’s:  This is a contraction for who is or who has.

Example: Who’s coming over for dinner?

Whose: This is the possessive case of who or which.

Example: Whose house are we going to for dinner?

 

Here’s an easy trick: If you were to replace it with who is or who has, would the meaning change? If no, you want who’s. If yes, you want whose.

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