Who's vs Whose

Quick Tip: Remember: Who's is a contraction of "who is" or "who has". Whose is a possessive pronoun (belonging to whom).

Who's

contraction

who is or who has

Examples:
  • Who's going to the party?
  • Who's been using my computer?
  • I wonder who's at the door.

Whose

possessive pronoun

belonging to or associated with which person

Examples:
  • Whose book is this?
  • The person whose car was stolen called the police.
  • I don't know whose idea this was.
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