Introduction
Learning definite articles is one of the first steps in Brazilian Portuguese. This article explains how to use os and as — the plural definite articles for masculine and feminine nouns — with clear rules, simple examples, common phrases, and practical tips for everyday situations.
- What are os and as?
- How to tell if a noun is masculine or feminine
- Using os and as in simple sentences
- Common phrases and real-life contexts
- Plural agreement: adjectives and articles
- Common mistakes and how to avoid them
- Quick reference: common plural nouns with os and as
- Short dialogues for practice
- Useful vocabulary and phrases to learn with articles
- Learning tips for fast progress
- Conclusion
What are os and as?
In Brazilian Portuguese, definite articles point to specific things, like the in English. Use o and a for singular, and os and as for plural. Os is used with masculine plural nouns and as with feminine plural nouns.
Basic rule
If the noun is masculine and plural, use os. If the noun is feminine and plural, use as.
Examples:
os carros — os carros means the cars
as casas — as casas means the houses
How to tell if a noun is masculine or feminine
Most nouns end in -o (masculine) or -a (feminine), but there are exceptions. For a beginner, these patterns are reliable and help you choose os or as.
Common endings
Nouns ending in -o are usually masculine. Plural: change -o to -os and use os.
Example vocabulary:
o livro → os livros — books
o amigo → os amigos — friends (masculine or mixed group)
Nouns ending in -a are usually feminine. Plural: change -a to -as and use as.
Example vocabulary:
a mesa → as mesas — tables
a amiga → as amigas — friends (feminine)
Exceptions and tips
Some nouns end in -e, -r, -l and their gender must be memorized. When unsure, learn the article with the noun: o telefone, a flor. Remember the article in singular; form the plural and use os or as accordingly.
Example:
o mapa → os mapas — maps
a flor → as flores — flowers
Using os and as in simple sentences
Beginner-friendly sentence structures help you use plural articles naturally. Start with subject + verb + object patterns.
As subjects
As meninas estudam. — As meninas estudam means The girls study.
Os alunos chegam às oito. — Os alunos chegam às oito means The students arrive at eight.
As direct objects
Eu comprei os livros. — I bought the books.
Ela viu as fotos. — She saw the photos.
Simple Q&A examples
Onde estão as chaves? — Where are the keys?
Você trouxe os documentos? — Did you bring the documents?
Common phrases and real-life contexts
Here are practical examples learners see on signs, menus, messages, or in conversation. Each example shows how os and as appear in everyday Brazilian Portuguese.
On a menu or in a café:
Os pratos do dia — The daily dishes
As bebidas geladas — The cold drinks
In a message or short note:
Peguei os ingressos. — I picked up the tickets.
Coloquei as chaves na mesa. — I put the keys on the table.
At the hotel or reception:
Preciso de os documentos do carro. — I need the car documents.
Deixe as malas aqui, por favor. — Leave the suitcases here, please.
Plural agreement: adjectives and articles
In Portuguese, adjectives agree in gender and number with the nouns they describe. When using plural nouns with os or as, make sure any adjective is also plural and matches gender.
Examples with masculine plural:
Os carros novos estão na rua. — The new cars are on the street.
Examples with feminine plural:
As bolsas grandes são caras. — The big bags are expensive.
Beginner tip
Learn adjectives with the noun and article: o carro novo, a bolsa grande. Then form the plural: os carros novos, as bolsas grandes. This reduces mistakes.
Common mistakes and how to avoid them
Beginners often mismatch gender or number. Here are frequent errors and corrections.
Error: Using os with feminine nouns
Wrong: os meninas
Right: as meninas
Error: Forgetting to pluralize the adjective
Wrong: as meninas bonito
Right: as meninas bonitas
Error: Mixing singular article with plural noun
Wrong: o livros
Right: os livros
To avoid errors, practice set phrases, read simple texts, and listen to native speakers. When you learn a new noun, memorize its article in singular and form the plural in your head before using it.
Quick reference: common plural nouns with os and as
Everyday masculine plural: os meses, os dias, os amigos, os sapatos, os lugares
Everyday feminine plural: as horas, as pessoas, as cartas, as portas, as janelas
Mini practice set
Choose the correct article for each plural noun:
1) carinhas — as or os? — as carinhas (female diminutive face expressions)
2) documentos — as or os? — os documentos
3) amigas — as or os? — as amigas
4) telefones — as or os? — os telefones
Short dialogues for practice
Dialogue 1 — at the store:
Cliente: Você tem as camisas azuis?
Vendedor: Sim, as camisas azuis estão ali.
Dialogue 2 — arranging a meeting:
Pessoa A: Podemos encontrar os amigos às sete?
Pessoa B: Sim, os amigos vão ao restaurante.
Useful vocabulary and phrases to learn with articles
When memorizing vocabulary, include the singular article so you will form plurals correctly.
o livro — os livros
a cadeira — as cadeiras
o estudante — os estudantes
a professorа — as professoras
Note: professorа is a feminine form commonly used in Brazil; keep gender consistent.
Practical sentence building
Start with simple templates. Replace nouns and adjectives while keeping agreement consistent.
Template subject: Os [noun masculino plural] [verb].
Example: Os meninos jogam. — The boys play.
Template subject: As [noun feminino plural] [verb].
Example: As meninas cantam. — The girls sing.
Learning tips for fast progress
1. Memorize nouns with their singular article: o or a. This makes choosing os or as automatic when you pluralize.
2. Read short, authentic texts (menus, signs, messages) and underline plural articles you see.
3. Speak short, realistic sentences out loud using everyday nouns: os ônibus, as lojas, os restaurantes.
4. Use flashcards that show the singular form on one side (with article) and plural on the other.
Conclusion
Mastering os and as is a small but essential step toward fluent Brazilian Portuguese. Remember to learn nouns with their singular articles, match adjectives in gender and number, and use the simple templates and dialogues in daily practice. With focused repetition and real-life examples you will quickly feel comfortable choosing os and as correctly.
