This document summarizes the uses of common Portuguese prepositions including: [1] At is used to indicate specific times, locations, or positions next to something. [2] In is used to indicate periods of time, locations within larger places like cities or countries, or positions inside something. [3] On is used to indicate days, dates, surfaces, or contact with something. The summary highlights the main uses and examples of at, in, and on in Portuguese based on the information provided in the document.

1. PREPOSITIONS AT – em, no(s), na (s), para Tempo definido She will arrive at two o’clock. at noon. at Christmas. at night. at Easter.

2. TAMBÉM: at breakfast, at lunch, at dinner.

3. b) Lugar definido He was not at home. at the theater. at the club. at school. at 518 Mexico Street. at the bus stop.

4. c) Junto à: The student is at the blckboard. at the door. at the window. at the table.

5. IN – dentro de, em, no(a), nos (as) Partes do dia She likes to study in the morning. in the afternoon. in the evening. EXCEÇÃO: at night

6. b) Meses – Estações do Ano – Anos She goes to the beach in December. in Summer. I met him in 2010.

7. c) Séculos – cidades – estados – países – continentes We are in the 21st century now. They live in New York. in Santa Catarina. in Brazil. in Europe.

8. d) Dentro de We are in the kitchen. in the car. in the living-room.

9. PAY ATTENTION! He is at the club. (jogando) He is in the club. (dentro do prédio)

10. ON – sobre, no (a), nos (as), em Dias da semana ou Mês, Ruas, Avenidas He traveled on a Tuesday. on May 1st on a sunny morning. on Christmas day

11. b) Ruas – Avenidas I live on Vicente Machado Street. c) Contato com alguma coisa The picture is on the table.