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"Quién" is a form of "quién", a pronoun which is often translated as "who". "Cuándo" is a form of "cuándo", an adverb which is often translated as "when". Learn more about the difference between "quién" and "cuándo" below.
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cuándo(
kwahn
-
doh
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. when
Nos vamos a casar, pero el cuándo y el dónde aún no lo sé.We are getting married, but I don't know when or where yet.