Quiénes vs. quienes
Quiénes
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who (plural) (in direct interrogative sentences)
¿Quiénes son estas personas? (Who are these people?)¿A quiénes de estos niños le darás el libro? (To which of these boys will you give the book?) -
who (plural) (in indirect interrogative sentences)
No sé quiénes eran, pero preguntaban por ti. (I don't know who they were, but they were asking about you.)Es importante recordar quiénes son tus amigos. (It is important to remember who your friends are.)
Quienes
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who, whom (plural) (relative pronoun)
Haz bien a quienes te odian. (Do good to those who hate you.)Él tiene tres hijos, quienes trabajan en la misma oficina. (He has three sons, who work in the same office.)Quienes lleguen último, perderán. (Those who arrive last will lose.)