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"Alguna" is a form of "alguna", a pronoun which is often translated as "someone". "Ningún" is an adjective which is often translated as "none of". Learn more about the difference between "ningún" and "alguna" below.
ningún(
neeng
-
goon
)An adjective is a word that describes a noun (e.g., the big dog).
1. (not any)
a. none of (in affirmative clauses)
Ningún testigo recuerda ver al sospechoso en la escena del crimen.None of the witnesses remember seeing the suspect at the crime scene.
b. any (in negative clauses)
Vivo en Hollywood, pero no conozco a ningún actor famoso.I live in Hollywood, but I don't know any famous actors.
2. (not one)
a. no (in affirmative clauses)
Ningún apartamento en este vecindario vale menos de un millón de dólares.No apartment in this neighborhood is worth less than one million dollars.
b. any (in negative clauses)
Cuando veas a Sadie, no quiero que hagas ningún comentario acerca de su corte de cabello.When you see Sadie, I don't want you to make any comments about her haircut.
alguna(
ahl
-
goo
-
nah
)A pronoun is a word that stands in for a noun (e.g., she).
a. someone (in affirmative clauses)
Estoy seguro de que alguna se llevó mis llaves por equivocación.I'm pretty sure someone took my keys by mistake.
b. somebody (in affirmative clauses)
¿Quién dejó sus tenis aquí? - Seguro que alguna del equipo de vóley de chicas.Who left their shoes here? - Somebody from the girls volleyball team, I'm sure.
c. anyone (in interrogative clauses)
Ana, Lucía, ¿alguna puede venir a darme una mano con las bolsas?Ana, Lucia. Can anyone come give me a hand with the bags?
d. anybody (in interrogative clauses)
¿Alguna vio mi celular? Estaba segura de que estaba sobre la mesa.Has anybody seen my cellphone? I swear I saw it on the table.
e. some (in affirmative clauses; replacing plural nouns)
La mayoría de las profesoras de idiomas son de aquí, pero algunas son extranjeras.Most language teachers are locals, but some are foreigners.
f. any (in interrogative and negative clauses)
Vine a este mercado para comprar fresas. ¿Tienes algunas?I came to this market to buy strawberries. Do you have any?