Whose or Who’s

Who’s is a short form of both who + is and who + has.

Whose is a possessive pronoun. It is used to talk about possession.

  • She’s the woman who’s going to be our new teacher.
    (who’s/who is)
  • This is Greg, who’s been working here for six years.
    (who’s/who has)
  • Whose dog ate my homework?