1. TEMPO (TIME)

IN

– Meses: in May
– Anos: in 2021
– Décadas / Séculos: in the 80s, in the 21st century
– Partes do dia: in the morning, in the afternoon

ON

– Dias específicos: on Monday
– Datas completas: on July 4th
– Dias de feriado: on Christmas Day

AT

– Horários: at 7 PM
– Partes específicas do dia: at noon, at midnight
– Feriados (geral): at Christmas
– Expressões fixas: at night, at the weekend (UK)

2. LOCALIZAÇÃO (LOCATION)

IN

– Dentro de algo: in a box, in a room
– Cidades, países, bairros: in Brazil, in Manhattan
– Líquidos ou massas: in water, in the soup
– Revistas / livros / jornais: in a magazine, in the newspaper

ON

– Superfícies: on the wall, on the floor, on the table
– Transportes públicos: on a bus, on a train, on a plane
– Ruas: on Main Street, on Avenue A
– Dispositivos eletrônicos: on TV, on the radio, on the phone

AT

– Pontos exatos: at the door, at the bus stop, at school
– Endereços completos: at 55 Main Street
– Eventos: at a party, at a meeting
– Instituições: at work, at the hospital

3. POSIÇÃO NO ESPAÇO / MOVIMENTO (SPACE / MOVEMENT)

IN

– Dentro de um espaço físico: He’s in the car. The milk is in the fridge.

ON

– Encostado, sobre algo: There’s a book on the shelf. Put the keys on the table.

AT

– Ponto fixo sem foco no interior ou superfície: He’s at the corner. They arrived at the station.

4. MEIOS DE TRANSPORTE

IN

– Transportes pequenos / privados: In a car, in a taxi

ON

– Transportes grandes / públicos ou abertos: On a bus, on a train, on a ship, on a bike

5. TECNOLOGIA / MÍDIA

ON

– Sempre com meios eletrônicos e superfície de acesso: On TV, on the internet, on YouTube, on a website
on the phone, on social media

IN

– Conteúdo interno: In a book, in a magazine, in an email

6. ESTADOS / SITUAÇÕES

IN

– in a hurry, in love, in trouble, in pain, in danger

ON

– on fire, on duty, on strike, on vacation, on a trip

AT
– at work, at home, at peace, at war, at ease

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7. EXPRESSÕES FIXAS

IN
– in time, in public, in advance, in general, in charge

ON
– on time, on purpose, on the right/left, on average

AT
– at the moment, at all, at least, at once, at the same time

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