People confuse these two words when writing because they sound the same when speaking--and, as always, that's confusing.
"Whose" is really the possessive form of "who."
Examples: Whose umbrella should I borrow today? I can't remember whose umbrella this is.
"Who's" is the contraction of "who is" or "who has."
Examples: Who's knocking at my door? I don't know who's been knocking at my door in the middle of the night.
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Visit our archive for past "Grammar Traps."
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