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:

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.

Who's

Who's is a contraction of either who is or who has. It has no other uses. (who is)

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.


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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