Quick answer
"One" is an adjective which is often translated as "un", and "who" is a pronoun which is often translated as "quién". Learn more about the difference between "one" and "who" below.
one(
wuhn
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (number)
a. un
I'm taking one class this semester.Estoy tomando una clase este semestre.
My nephew is one year old.Mi sobrino tiene un año.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
2. (number)
a. el uno
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
One is the loneliest number that you've ever seen.Uno es el número más solitario que has visto.
3. (with ages and times)
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Charlie's one on Tuesday.Charlie cumple un año el martes.
Let's meet at one.Nos vemos a la una.
A pronoun is a word that stands in for a noun (e.g. she).
4. (related to a previously mentioned thing or person)
a. el uno
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
, la una
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
I'll have a beer if you're having one.Yo me tomo una cerveza si tú tomas una.
b.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
He's the one I told you about the other day.Ese es el de quien te hablé el otro día.
I think I'll take the yellow one.Creo que me llevo la amarilla.
c. el único
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
, la única
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
I knew from the start James was the one for me.Supe desde el principio que James era el único para mí.
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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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