Indefinite Articles in Spanish
Indefinite articles in Spanish translate in English to a, an, some or a few. Just like definite articles, indefinite articles indicate the gender (masculine or feminine) and number (singular or plural) of a noun and have four forms.
Indefinite Article Forms:
Matching Gender and Number
The indefinite article always has to match both the gender and number of its noun. If the noun is masculine and singular (like gato) , then its article also has to be masculine and singular (un gato ). If that same noun were plural (gatos) the article would also be plural (unos gatos ).
When a feminine singular noun begins with a stressed á, a, or ha, the masculine indefinite article is used instead of the feminine indefinite article to aide in pronunciation.
When the same noun is plural, the regular feminine article is used.