Quick answer
"When" is an adverb which is often translated as "cuándo", and "who" is a pronoun which is often translated as "quién". Learn more about the difference between "when" and "who" below.
when(
wehn
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (in questions)
a. cuándo
When was the last time you cried?¿Cuándo fue la última vez que lloraste?
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
2. (relative)
a. cuando
I was sleeping when he got home.Estaba durmiendo cuando llegó a casa.
b. en que
That was the year when we bought our first apartment.Ese fue el año en que compramos nuestro primer apartamento.
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who(
hu
)
A pronoun is a word that stands in for a noun (e.g. she).
1. (interrogative)
a. quién
Hello? Who is calling?¿Hola? ¿Quién llama?
I don't know who he is, but he looks a lot like my brother.No sé quién es, pero se parece mucho a mi hermano.
2. (relative)
a. quien
My father, who is 60 years old, won a tennis tournament.Mi padre, quien tiene 60 años, ganó un torneo de tenis.
b. que
My friend is the one who has a date tonight.Mi amigo es el que tiene una cita esta noche.
WHO
An abbreviation is the shortened form of a word or group of words (e.g. "UFO" = "unidentified flying object"; "p." = "page").
abbreviation
3. (World Health Organization)
a. OMS
Breast milk has many benefits. According to the WHO, exclusive breastfeeding is the best option during the first six months of life.La leche materna tiene muchos beneficios. Según la OMS, el amamantamiento exclusivo es la mejor opción durante los primeros seis meses de vida.
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