Look at these examples.
Note that to express a/an + [singular noun] in Spanish, you use either un or una, depending on the gender of the noun it refers to, as follows:- una for feminine singular nouns
- un for masculine singular nouns
You can never use uno, instead of un.
Tengo uno coche.
Tengo un coche.Uno is not an article, but the actual number one, and it works as a pronoun. See also Using numbers as pronouns.
It is important to remember that in Spanish, like in all Latin languages, every noun is either masculine or feminine.Using los or las to say the (plural definite articles)