Definite and Indefinite Articles

• Definite and Indefinite Articles: Part I

the definite article has 4 forms, depending on whether the noun is masculine, feminine, singular or plural.
el gato
    the male cat
los gatos
    the male cats
la gata
    the female cat
las gatas
    the female cats

The masculine plural definite and indefinite articles (los, unos) are also used to indicate a group of mixed sex. Thus, “los gatos” could refer to a group of 10 male cats, or it could refer to a group of 9 female cats and one male cat.


the indefinite article has 4 forms, depending on whether the
noun is masculine, feminine, singular or plural.
un gato
    a male cat
unos gatos
    some male cats
una gata
    a female cat
unas gatas
    some female cats

http://studyspanish.com/grammar/lessons/defart1