Definite Articles (artículos definidos): the
There are four ways to express the word “the” in Spanish: el-la-los-las. The singular “the” forms el-la must be matched with singular nouns and the plural “the” forms must be matched with plural nouns.
With people
|  | Masculine |  | Feminine |  | 
| Singular | el chico | the boy | la chica | the girl | 
| Plural | los chicos | the boys | las chicas | the girls | 
|  | Masculine | Feminine |  | 
| Singular | el profesor | la profesora | the professor | 
| Plural | los profesores | las profesoras | the professors | 
Things
|  | Masculine |  | Feminine |  | 
| Singular | el libro | the book | la mesa | the table | 
| Plural | los libros | los books | las mesas | the tables | 
Irregular nouns
|  | Masculine |  | Feminine |  | 
| Singular | el día | the day | la mano | the hand | 
| Plural | los días | the days | las manos | the hands | 
Indefinite Articles (artículos indefinidos): a, an, some, a few
There are also four indefinite articles: un-una-unos-unas. The singular forms take on the meaning of “a” or “an”:
|  | Masculine |  | Feminine |  | 
| Singular | un chico | a boy | una chica | a girl | 
| Singular | un tío | an uncle | una tía | an aunt | 
However, the plural forms unos and unas mean “some” or “a few”:
|  | Masculine |  | Feminine |  | 
| Plural | unos chicos | some boys | unas chicas | some girls | 
| Plural | unos libros | a few books | unas mesas | a few tables | 
| Plural (irr.) | unos días | some days | unas manos | a few hands |