"Indefinidos" are words like "algún" (some), or "ningún" (none) that we use to describe unspecified quantities. They can refer to people or things, without specifying who or what.

Here we'll look at the most frequent forms of "indefinidos" in Spanish and learn how to use them correctly.

algún, alguna, algunos, algunas

We use "algún", "alguna", "algunos", "algunas" when we don't want to specify a quantity or someone's identity. They change their form depending on the gender and number of the noun that follows.

algún + masculine singular noun:

¿Hay algún médico aquí? (Are there any doctors in here?)

alguna + feminine singular noun:

¿Tienes alguna receta para hacer gazpacho? (Do you have any recipes for gazpacho?)

algunos + masculine plural noun:

Había algunos estudiantes de mi escuela en la fiesta. (There were some students from my school at the party.)

algunas + feminine plural noun:

Algunas copas están rotas. (Some glasses are broken.)

We use "ningún" or "ninguna" when there isn't even one single thing or person. We normally use them in the singular.

ningún + masculine singular noun:

No he recibido ningún correo electrónico de la agencia. (I havent received any emails from the agency.)

ninguna + feminine singular noun:

No hay ninguna película buena en el cine ahora. (At the moment there aren't any good films at the cinema.)

When we use "ningún" after the verb, we need to use "no" before that verb.

Ningún estudiante aprobó el examen. (Not one student passed the exam.)

No aprobó el examen ningún estudiante. (Not one student passed the exam.)

We use "algún" and "ningún" before a singular masculine noun. If there isn't a noun because it's clear who or what we're talking about, we add an "-o" at the end: "alguno", "ninguno".

Estoy buscando un cine, ¿hay alguno por aquí? - No, no hay ninguno. (I'm looking for a cinema, are there any around here? - No, there aren't any.)

¿Hay algún cine por aquí? - No, no hay ningún cine. (Are there any cinemas around here? - No, there aren't any.)

Here's a tip!

Let's quickly review all the forms we've seen so far.

Masculine singular / plural

Feminine singular / plural

algún(o) / algunos

alguna / algunas

ningún(o)

ninguna

alguien, nadie

We use "alguien" and "nadie" to refer to people. They never change their form. We use:

"alguien" in affirmative sentences and questions.

¿Hay alguien en casa? (Is there anybody at home?)

Alguien ha roto el vaso. (Somebody has broken the glass.)

"nadie" in negative sentences.

Nadie vino a la fiesta. (Nobody came to the party.)

We use "algo" and "nada" to refer to things. They never change their form. We use:

"algo" in affirmative sentences and questions.

¿Has dicho algo? (Did you say something?)

Hay algo detrás del árbol. (There is something behind the tree.)

"nada" in negative sentences

No he comprado nada. (I haven't bought anything.)

Here's a tip!

When we use "nada" and "nadie" after the verb, we have to use "no" before that verb.

No me llamó nadie. (Nobody called me.)

Nadie me llamó. (Nobody called me.)

No me gusta nada. (I don't like anything.)

Nada me gusta. (I don't like anything.)

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