Indefinite Articles in SpanishStart first lesson
Indefinite Article Forms
Matching Gender and Number
The indefinite article always has to match both the gender and number of its noun. For example if a noun is masculine and singular (like gato), then its article also has to be masculine and singular (so, un gato). If that same noun were plural (like gatos), the article would also be plural (so, unos gatos).
When a feminine singular noun begins with a stressed a or ha, the masculine indefinite article (un) is used instead of the feminine indefinite article (una).
When the same noun is plural, the feminine article is used.