alguno

Alguno is a Spanish indefinite determiner and pronoun meaning “some” or “any,” used to refer to an unspecified member of a group. It can modify a noun or stand alone as a pronoun, with various gender and number forms.

Forms and agreement: when used before a masculine singular noun, the form is written as alg ú n with the acute accent (algún), as in algún día or algún libro. The feminine singular form is alguna. The plural forms are algunos (masc.) and algunas (fem.). As a pronoun, the standalone forms are alguno (masc. sing.), alguna (fem. sing.), algunos (masc. plural), and algunas (fem. plural).

Usage notes: algú n is used similarly to other indefinite determiners, to indicate an unspecified item in affirmative questions, statements, or with nouns. It is common in questions like ¿Tienes algún libro? (Do you have any book?) and in statements such as Estoy buscando alguna solución. When used as a pronoun, alguno/alguna/as/as can replace a noun, for example, ¿Quieres alguno de estos? or No quiero ninguno. In negative contexts, ninguno is typically used to express “none,” as in No tengo ninguno. The choice between alguno/alguna and ninguno depends on whether emphasis is on “some” versus “none.”

See also: related Spanish indefinites include alguno/a(s) and ninguno, as well as similares like cualquier and alguno de.