Definition
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whose
used to ask about the owner of something
used to inquire about the owner of something or someone.
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Whose book is this on the table?
¿De quién es este libro en la mesa?
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I met a girl whose brother is a famous musician.
Conocí a una chica cuyo hermano es un músico famoso.
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Whose turn is it to play next?
¿De quién es el turno de jugar ahora?