—>Who’s is a contraction (a combination of words) meaning ‘who is’ or ‘who has.’
Examples: Who’s in charge here? Who’s hungry? I’ll determine who’s going to make the team. Questions go to John, who’s the chief engineer.
—>Whose is a pronoun (a word that can function as a noun or noun phrase) meaning ‘belonging to or associated with a person’ or ‘of whom or which.’
Examples: Whose shirt is this? He’s a doctor whose opinion I value. I don’t know whose keys these are.
—>If you’re unsure about which to use, there is a simple way to tell. Replace who’s/whose with ‘who is.’ If the sentence still makes sense, then use who’s. If it doesn’t, use whose.
Examples: Who is in charge here? Who is hungry? I’ll determine who is going to make the team.
These sentences make sense, so you can use who’s.
Examples: Who is shirt is this? He’s a doctor who is opinion I value. I don’t know who is keys these are.
These sentences don’t make sense, so you should use whose.
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