Indefinite articles (un, una, unos, unas)

Indefinite Articles: A, An, Some

In previous lessons, we used definite articles like el and la to talk about specific things ("the" boy, "the" girl). When we want to talk about things generally—like "a" boy, "an" animal, or "some" birds—we use indefinite articles.

Just like definite articles, these must agree with the noun's gender (masculine or feminine) and number (singular or plural).

GenderSingular ("a / an")Plural ("some")
Masculineununos
Feminineunaunas
The bird is a small animal.
El pájaro es un animal pequeño.
The boy is a new student and the girl is a new student.
El chico es un estudiante nuevo y la chica es una estudiante nueva.

Contrasting Specific and General

You will often mix definite ("the") and indefinite ("a / an") articles in the same sentence to contrast specific known places or items with general ones.

A town is small and the city is big.
Un pueblo es pequeño y la ciudad es grande.

Plural Articles: "Some"

When you have more than one unspecific item, use the plural forms unos (for masculine or mixed groups) and unas (for strictly feminine groups). In English, these naturally translate to "some".

Some small birds are fast.
Unos pájaros pequeños son rápidos.
It is a house with some tall trees.
Es una casa con unos árboles altos.

Tricky Genders and Adding Emphasis

To emphasize an adjective, you can place the word muy (very) right before it.

Additionally, watch out for nouns that break the typical gender rules. For example, the word problema ends in -a, but it is actually masculine! Because of this, it uses masculine articles like un.

It is a very big problem.
Es un problema muy grande.

A word like idea, however, follows the normal rules and is feminine.

It is a very good idea.
Es una idea muy buena.

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