An indefinite pronoun is a small group of pronouns such as everything, nobody or something, which are used to refer to people or things in a general way, without saying exactly who, what or how many they are.
- Alguien “somebody/anybody” is used in affirmative or interrogative sentences to refer to a person. Algo “something/anything” is the equivalent pronoun used to refer to a thing.
He visto a alguien en la puerta (I have seen somebody at the door)
Tengo algo para ti (I have something for you)
- The negative form of alguien is nadie “no one” and the negative form of algo is nada “nothing”. Notice that Spanish uses double negatives, unlike English.
No he visto a nadie en la puerta (I haven’t seen anyone at the door)
No tengo nada para ti (I have nothing for you)
- Alguno/a (some, any) shortens to algún before a masculine, singular noun, and varies in gender and number according to the noun it refers to alguno, alguna, algunos, algunas:
|¿Hay algún museo en la ciudad?
Necesito un taxi. ¿Ve Ud. alguno?
Algunas sociedades son muy estrictas.
|(Is there any museum in the city?)
(I need a taxi. Do you see any?)
(Some societies are very strict).
- Ninguno/a (none, no) shortens to ningún before a masculine, singular noun. When it follows the verb, a double negative is required:
|No hay ningún problema.
¿Tenéis amigos? No tenemos ninguno.
Ninguna sociedad es perfecta.
|(There is no problem).
(Do you have any friends? We have none).
(No society is perfect).
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