whose and who's

Who's is short for who is or who has. (This is a 100% rule - it has no other
uses.)
Whose is a bit more complicated. It sits before a noun to state (or ask) to whom it belongs. For example:
Whose is a bit more complicated. It sits before a noun to state (or ask) to whom it belongs. For example:
- A king whose crown is too big.
- Whose crown is this?
Who's and Whose
The terms whose and who's sound identical, but they perform very different roles in English.Whose
Whose is the possessive form of who. It means belonging to whom. Whose usually sits before a noun.- Conscience is a mother-in-law whose visit never ends.
- Whose bike was expensive?
- Carl knows the girl whose phone was stolen.
Who's
Who's is a contraction of either who is or who has. It has no other uses.- Who's coming to fix the bed?
- Who's eaten the last muffin?
- I met the inspector who's delivering tomorrow's briefing.
A Quick Test


WHO'S = WHO IS OR WHO HAS
If you cannot substitute the who's in your sentence with either who is or who has, then it is wrong.
If you cannot substitute the who's in your sentence with either who is or who has, then it is wrong.
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See Also
What are nouns? What are contractions? What are interrogative pronouns? What are relative pronouns?List of easily confused words