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Preposições
a  ·  de  ·  em

Three of the most common prepositions in Brazilian Portuguese — a, de, and em — contract with articles to form new words. Master their main uses and contractions with this interactive material.

Contrações Uso comum
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Language Note

Three essential prepositions and how they combine with articles

de

Common uses

  • From
    Sou de Nova York.
    I'm from New York.
  • Belonging
    O carro do meu chefe.
    My boss's car. (de + o)
  • Content
    Uma xícara de café.
    A cup of coffee.
Contractions with DE
de + o = do de + a = da de + os = dos de + as = das
em

Common uses

  • Location
    Moro em São Paulo.
    I live in São Paulo.
  • Place (with article)
    Estou no escritório.
    I'm at the office. (em + o)
  • Work / study
    Trabalho numa empresa grande.
    I work at a big company. (em + uma)
Contractions with EM
em + o = no em + a = na em + os = nos em + as = nas em + um = num em + uma = numa
a

Common uses

  • Direction
    Vou ao mercado.
    I'm going to the market. (a + o)
  • Time
    A reunião é às 9h.
    The meeting is at 9. (a + as)
  • Position
    Fica à direita.
    It's on the right. (a + a)
Contractions with A
a + o = ao a + a = à a + os = aos a + as = às
📋 Complete contractions table
Preposition + o (masc.) + a (fem.) + os (m. pl.) + as (f. pl.) + um + uma
DE dode + o dade + a dosde + os dasde + as
EM noem + o naem + a nosem + os nasem + as numem + um numaem + uma
A aoa + o àa + a aosa + os àsa + as
⚠️ Important: In Portuguese, contractions are mandatory — you cannot say "de o", "em a", or "a o". The contracted form is always required: do, na, ao.

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Homework Exercises

Complete after your lesson and send your answers to your teacher

1

Complete the sentences — Word bank

Click a word from the bank, then click the blank to place it

Click a word from the box below, then click the blank where it belongs. Each word is used only once. Use the contractions table above for reference!

de do da dos em no na ao à às nas aos
2

Contractions — What is the result?

Choose the correct contracted form for each combination

Each row shows a preposition + article. Choose the correct contraction from the dropdown. Use the table above as a reference!


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Escreva sobre você

Use A, DE, or EM to write true sentences about your life

3

Complete with your own ideas

There are no wrong answers here — just use the right preposition!

Write true sentences about yourself. Pay attention to which preposition (and which contracted form) fits each context.

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