Articles in Portuguese If you wanna know about articles in portuguese: We have: Definite articles: O - male nouns in singular A - female nouns in singular Os - male nouns in plural As - female nouns in plural Indefinite articles: Um - male nouns in singular Uma - female nouns in singular Uns - male nouns in plural Umas - female nouns in plural The difference between the kinds of articles is: Definite articles: used to refer a specific  someone or something. Indefinite articles: used to refer a someone or something vaguely. Exemple: The woman - A mulher. I know about what woman I am speaking. A man - Um homem. I am speaking about a man, but I don’t know about who. He can be anyone. You can know if a noun is female or male looking the last letter. In the most of times, if is A, the noun is female. If the letter is O, the noun is male.