Definition
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quien
La palabra 'quien' se utiliza para referirse a una persona o personas de manera interrogativa o relativa.
The word 'who' is used to refer to a person or people in an interrogative or relative manner.
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¿Quien viene a la fiesta esta noche?
Who is coming to the party tonight?
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No sé quien dejó la puerta abierta.
I don't know who left the door open.
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La mujer quien habla es mi profesora.
The woman who is speaking is my teacher.