Preposições de Tempo: in, on, at
in pra coisas grandes, on pra dias e at pra momentos exatos.
Grammar Rule in 30 Seconds
Use 'at' for specific times, 'on' for days and dates, and 'in' for long periods like months and years.
- Use 'at' for precise clock times like 'at 5:00 PM'.
- Use 'on' for specific days and dates like 'on Monday'.
- Use 'in' for months, years, and seasons like 'in summer'.
Overview
in 5 PM e recebeu um emoji de confusão? Palavras pequenas causam grandes dores de cabeça no inglês. Essas minúsculas preposições são os semáforos das suas frases.in, on e at para diferentes fatias de tempo.In cobre grandes blocos como meses e anos.On lida com dias e datas específicas. At é para o momento exato no relógio. É como dar zoom em um mapa.a 5 minutos, mas na verdade acabou de acordar. Você precisa conhecer as regras para pegá-las!How This Grammar Works
in. Isso é para períodos gerais e longos.visão geral. No meio, temos on. Isso é para dias específicos.at. Isso é para pontos precisos no tempo.in para uma hora específica é como tentar tomar sopa com um garfo. Simplesmente não funciona! Na maioria das vezes, a regra segue essa lógica de tamanho.at night que você só precisará memorizar. Use essas regras para consertar suas legendas no Instagram ou seu próximo convite de Zoom.
Formation Pattern
at + Hora Precisa.
at 9:00 AM, at noon.
on + Dias e Datas.
on Monday, on July 4th, on my birthday.
in + Longos Períodos.
in October, in 2025, in the summer, in the morning.
When To Use It
at para horas do relógio. É para o momento exato em que seu Uber chega. Use para pontos como at sunset ou at bedtime. Use at night porque o inglês é estranho assim.on para qualquer coisa que você possa encontrar em uma página de calendário. Isso inclui dias como on Friday. Também inclui datas como on May 12th. Se tiver a palavra day, use on. Exemplos: on Christmas Day.in para as coisas grandes. Use para meses como in January. Use para anos como in 1999. Use para estações como in spring. Você também usa para partes do dia. Exemplos: in the morning, in the afternoon, in the evening.
Common Mistakes
in Monday. Este é um erro clássico de iniciante. Diga on Monday.at the morning. Isso soa muito estranho para ouvidos nativos. Diga in the morning.in 2024.Contrast With Similar Patterns
In the car (lugar) vs In the morning (tempo). Para o tempo, estamos focando no quando.Quick FAQ
Eu uso at ou in para a noite?
Sempre use at night. É uma exceção à regra de in the morning.
E sobre o meu aniversário?
Use on my birthday. É um dia específico.
Time Preposition Categories
| Preposition | Usage Category | Examples |
|---|---|---|
|
At
|
Precise Time / Points
|
at 3:00, at noon, at dinner, at bedtime
|
|
On
|
Days / Dates
|
on Monday, on Christmas Day, on my birthday
|
|
In
|
Months / Years
|
in January, in 2025, in the 90s
|
|
In
|
Seasons
|
in summer, in the fall, in winter
|
|
In
|
Parts of Day
|
in the morning, in the afternoon, in the evening
|
|
At
|
Exceptions (Night)
|
at night, at the weekend (UK)
|
Meanings
These prepositions act as markers to tell the listener exactly when an event occurs relative to the calendar or clock.
Precise Time (At)
Used for specific points on a clock or specific moments in the day.
“I wake up at 7:00.”
“The stars come out at night.”
Days and Dates (On)
Used for 24-hour periods, including days of the week and specific calendar dates.
“I play soccer on Tuesdays.”
“My birthday is on May 5th.”
Long Periods (In)
Used for months, years, centuries, seasons, and general parts of the day.
“It is hot in August.”
“I was born in 1995.”
Reference Table
| Preposição | Uso | Exemplos | Contexto Moderno |
|---|---|---|---|
|
at
|
Hora Exata
|
at 5:30 PM, at noon
|
Hora de chegada do Uber
|
|
at
|
Exceções
|
at night, at the weekend
|
Noite de jogos
|
|
on
|
Dias
|
on Monday, on Friday
|
Reunião semanal no Zoom
|
|
on
|
Datas
|
on July 4th, on Oct 21st
|
Post de aniversário no Instagram
|
|
in
|
Partes do Dia
|
in the morning, in the evening
|
Tomando café da manhã
|
|
in
|
Meses/Anos
|
in June, in 2025
|
Lançamento do Spotify Wrapped
|
|
in
|
Estações
|
in summer, in winter
|
Vlog de férias de verão
|
Espectro de formalidade
I shall meet with you on Monday. (scheduling)
I'll see you on Monday. (scheduling)
See ya Monday! (scheduling)
Catch you Mon. (scheduling)
O Mapa das Preposições de Tempo
IN (Geral)
- Meses In June
- Anos In 2025
ON (Dia Específico)
- Dias On Monday
- Datas On May 1st
AT (Preciso)
- Hora Exata At 9 AM
- Momentos At noon
Do Grande ao Pequeno: A Pirâmide do Tempo
Qual Preposição Devo Usar?
É uma hora exata?
É um dia ou uma data?
Categorias de Uso Comuns
Horas Exatas
- • at 5:00
- • at noon
- • at midnight
Dias e Datas
- • on Friday
- • on June 10
- • on my birthday
Períodos Longos
- • in winter
- • in 2024
- • in the 90s
Exemplos por nível
I wake up at 6:00.
Me despierto a las 6:00.
The party is on Saturday.
La fiesta es el sábado.
My birthday is in July.
Mi cumpleaños es en julio.
I study in the evening.
Estudio por la tarde.
We met on October 12th.
Nos conocimos el 12 de octubre.
I don't like driving at night.
No me gusta conducir de noche.
The store opens in the morning.
La tienda abre por la mañana.
He was born in 1998.
Él nació en 1998.
I'll see you at the weekend.
Te veré el fin de semana.
The train leaves in five minutes.
El tren sale en cinco minutos.
We go skiing in winter.
Vamos a esquiar en invierno.
The meeting is at noon.
La reunión es al mediodía.
Please arrive on time for the interview.
Por favor, llegue a tiempo para la entrevista.
We arrived just in time for the start.
Llegamos justo a tiempo para el comienzo.
At the age of ten, she could play piano.
A los diez años, ella podía tocar el piano.
The project starts in the spring.
El proyecto comienza en la primavera.
On the morning of the wedding, it rained.
En la mañana de la boda, llovió.
At the turn of the century, life changed.
Al cambiar el siglo, la vida cambió.
In the heat of the moment, he agreed.
En el calor del momento, él aceptó.
The decision was made at the last minute.
La decisión se tomó en el último minuto.
In times of yore, knights rode horses.
En tiempos de antaño, los caballeros montaban caballos.
At no point during the day did he call.
En ningún momento del día llamó.
On the stroke of midnight, the year ends.
Al sonar la medianoche, el año termina.
In the interim, we must wait.
En el ínterin, debemos esperar.
Fácil de confundir
Learners use 'in' when they mean 'before the end of'.
Both sound similar but have different meanings regarding punctuality.
Learners mix up physical/temporal points with results.
Erros comuns
I see you in Monday.
I see you on Monday.
The class is in 10:00.
The class is at 10:00.
I sleep in night.
I sleep at night.
I go on July.
I go in July.
I saw him in last Friday.
I saw him last Friday.
On the morning, I drink tea.
In the morning, I drink tea.
At 2023, I was a student.
In 2023, I was a student.
I will finish on two weeks.
I will finish in two weeks.
The meeting is in noon.
The meeting is at noon.
In the beginning of the movie...
At the beginning of the movie...
Padrões de frases
I have a ___ at ___ on ___.
In ___, the weather is ___.
I was born in ___ on ___.
At ___, I usually ___ in the ___.
Real World Usage
See u at 8!
I started my last job in 2021.
Your appointment is on Tuesday at 10:00.
Throwback to my trip in 2019!
The flight lands at 6:00 AM on Sunday.
The deadline is on Friday in the afternoon.
A Regra do 'Dia'
I have a meeting on Monday.
Noite vs Manhã
in the morning, in the afternoon, in the evening, mas at night. Esse é um dos errinhos mais comuns! I drink coffee in the morning.
Fim de Semana
on the weekend. Já na Inglaterra, é mais comum at the weekend. Ambos estão certinhos, então escolha um e use sempre ele! "Let's travel on the weekend."Smart Tips
If the word 'Day' is in the name (like Christmas Day), use 'on'. If not, use 'at' or 'in'.
Always use 'on' if there is a number (the day) present.
Imagine 'next' and 'last' are magnets that push the preposition away.
Group 'morning, afternoon, evening' together for 'in', and keep 'night' separate for 'at'.
Pronúncia
Weak form of 'at'
In natural speech, 'at' is often reduced to /ət/.
Linking 'on'
When 'on' is followed by a vowel, it links. 'On October' sounds like 'O-noctober'.
Time Stress
I'll be there AT five.
Stress the preposition if you are correcting someone's time.
Memorize
Mnemônico
AT a point, ON a day, IN a period stay.
Associação visual
Imagine a pyramid. The sharp point at the top is 'AT' (a point in time). The middle slice is 'ON' (a flat calendar day). The big base is 'IN' (a large container of time).
Rhyme
At for clock, On for day, In for months—that's the way!
Story
I woke up AT 7:00 ON a sunny Monday IN June. The birds were singing IN the morning, and I felt great.
Word Web
Desafio
Look at your calendar for next week. Write down three things you are doing using 'at', 'on', and 'in'.
Notas culturais
British speakers say 'at the weekend'.
American speakers say 'on the weekend'.
In international business, dates are often written DD/MM/YY, but prepositions remain the same.
These prepositions come from Old English: 'æt' (at), 'on' (on), and 'in' (in).
Iniciadores de conversa
What do you usually do at 8:00 PM?
When is your birthday?
What happened in 2020?
Do you prefer working in the morning or at night?
Temas para diário
Erros comuns
Test Yourself
The party starts ___ 9 PM.
Escolha a frase gramaticalmente correta:
Find and fix the mistake:
I usually go to the gym in Mondays.
Score: /3
Exercicios praticos
8 exercisesI have a meeting ___ 9:00 AM.
My birthday is ___ June.
Find and fix the mistake:
I go to the gym in Mondays.
The stars shine ___ night.
party / Saturday / is / the / on
1. 5:00, 2. Monday, 3. 2024
I'll see you ___ next week.
We arrived ___ the morning.
Score: /8
Practice Bank
10 exercisesI love to drink tea ___ the morning.
The movie starts on 7:30.
on / meet / Let's / Saturday
Él nació en 1995.
Selecione a frase correta:
Conecte os pares:
I'll see you ___ July.
We went to Paris at the summer.
Escolha o correto:
Class is ___ 2:00 PM.
Score: /10
Perguntas frequentes (8)
This is an old idiomatic exception in English. There is no logical reason, but 'at night' is the standard form.
Use 'on' for specific dates (on May 5th) and 'in' for just the month (in May).
Both are correct! 'At' is British, and 'on' is American.
No, that is incorrect. Days of the week always use 'on'.
Use 'in' for seasons (in summer, in winter).
No. Words like 'yesterday', 'today', and 'tomorrow' do not need prepositions.
Yes, 'noon' and 'midnight' are specific points in time, so they use 'at'.
Use 'in' for decades and centuries because they are long periods of time.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
en / a
Spanish uses 'en' for days of the week, but English uses 'on'.
à / en / le
French doesn't use a preposition for days of the week.
um / am / im
The logic is almost identical to English.
ni (に)
One particle (ni) covers at, on, and in.
fī (في)
Arabic relies heavily on 'fī' where English splits into three.
zài (在) / (none)
Chinese usually omits prepositions for time.
Learning Path
Prerequisites
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