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 PM이라고 썼다가 당황한 이모티콘을 받은 적 있나요? 영어에서 작은 단어들은 큰 골칫거리가 되기도 합니다. 이 작은 전치사들은 문장의 신호등과 같습니다.in, on, at을 다르게 사용합니다.in은 달이나 년도 같은 큰 덩어리를 담당합니다.on은 특정한 날짜와 요일을 다룹니다. at은 시계 위의 정확한 순간을 나타냅니다. 지도에서 줌인을 하는 것과 비슷해요.How This Grammar Works
in이 있습니다. 일반적이고 긴 기간에 사용됩니다.on이 있습니다. 특정한 날에 사용됩니다.at이 있습니다. 정확한 시점에 사용됩니다.in을 사용하는 것은 포크로 수프를 먹으려는 것과 같습니다. 절대 안 되죠! 대부분의 경우 규칙은 이 크기 논리를 따릅니다.at night처럼 그냥 외워야 하는 몇 가지 예외가 있습니다. 이 규칙들을 활용해 인스타그램 캡션이나 다음 줌 회의 초대를 수정해 보세요.
Formation Pattern
at + 정확한 시간을 사용하세요.
at 9:00 AM, at noon.
on + 요일과 날짜를 사용하세요.
on Monday, on July 4th, on my birthday.
in + 긴 기간을 사용하세요.
in October, in 2025, in the summer, in the morning.
When To Use It
at을 사용합니다. 우버가 도착하는 바로 그 정확한 순간을 위해서죠. at sunset이나 at bedtime 같은 시점에도 사용합니다. 영어는 좀 특이해서 밤에는 at night을 씁니다.on을 사용합니다. 여기에는 on Friday 같은 요일이 포함됩니다. on May 12th 같은 날짜도 포함되죠. 단어에 'day'가 들어가면 on을 쓰세요. 예: on Christmas Day, on New Year's Day.in을 사용합니다. in January 같은 달, in 1999 같은 연도, in spring 같은 계절에 씁니다. 하루 중의 시간대에도 사용합니다. 예: in the morning, in the afternoon, in the evening.
Common Mistakes
in Monday라고 하지 마세요. 초보자들이 가장 많이 하는 실수입니다. on Monday라고 하세요.at the morning이라고 하지 마세요. 원어민들에게는 매우 이상하게 들립니다. in the morning이라고 하세요.in 2024를 사용합니다.Contrast With Similar Patterns
In the car(장소) vs In the morning(시간). 시간의 경우, 우리는 '언제'에 집중하고 있습니다.Quick FAQ
밤에는 at을 쓰나요, in을 쓰나요?
항상 at night을 사용하세요. in the morning 규칙의 예외입니다.
제 생일에는 뭘 쓰나요?
on my birthday를 사용하세요. 특정한 날이니까요.
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
| 전치사 | 언제 쓸까요? | 예시 | 실생활 활용 |
|---|---|---|---|
|
at
|
정확한 시각
|
at 5:30 PM, at noon
|
우버 도착 시간 확인
|
|
at
|
예외적인 순간
|
at night, at the weekend
|
심야 게임할 때
|
|
on
|
요일
|
on Monday, on Friday
|
매주 화상 회의
|
|
on
|
특정 날짜
|
on July 4th, on Oct 21st
|
인스타 생일 포스팅
|
|
in
|
하루의 부분
|
in the morning, in the evening
|
모닝 커피 마시기
|
|
in
|
월 / 연도
|
in June, in 2025
|
연말 결산 리포트
|
|
in
|
계절
|
in summer, in winter
|
여름 휴가 브이로그
|
격식 수준 스펙트럼
I shall meet with you on Monday. (scheduling)
I'll see you on Monday. (scheduling)
See ya Monday! (scheduling)
Catch you Mon. (scheduling)
시간 전치사 지도
IN (일반적/넓은 범위)
- 월 In June
- 연도 In 2025
ON (특정한 날)
- 요일 On Monday
- 날짜 On May 1st
AT (정확한 시점)
- 시계 시간 At 9 AM
- 특정 순간 At noon
큰 것부터 작은 것까지: 시간 피라미드
어떤 전치사를 써야 할까요?
정확한 시계 시간인가요?
요일이나 날짜인가요?
자주 쓰는 카테고리
시계 시간
- • at 5:00
- • at noon
- • at midnight
요일 & 날짜
- • on Friday
- • on June 10
- • on my birthday
긴 기간
- • in winter
- • in 2024
- • in the 90s
수준별 예문
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.
혼동하기 쉬운
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.
자주 하는 실수
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...
문장 패턴
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.
'Day' 규칙
on Monday, on Christmas Day, on my birthday.밤과 아침의 차이
in the morning이지만, 밤은 꼭 at night이라고 해야 해요.주말 표현법
on the weekend, 영국인은 at the weekend라고 해요. 둘 다 맞으니 하나만 골라 써보세요!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'.
발음
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.
암기하기
기억법
AT a point, ON a day, IN a period stay.
시각적 연상
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
챌린지
Look at your calendar for next week. Write down three things you are doing using 'at', 'on', and 'in'.
문화 노트
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).
대화 시작하기
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?
일기 주제
자주 하는 실수
Test Yourself
The party starts ___ 9 PM.
at을 사용합니다.Choose the grammatically correct sentence:
on을 씁니다.Find and fix the mistake:
I usually go to the gym in Mondays.
on이 필요합니다.Score: /3
연습 문제
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
그는 1995년에 태어났어요.
맞는 표현을 고르세요:
알맞게 짝지으세요:
I'll see you ___ July.
We went to Paris at the summer.
올바른 표현을 고르세요:
Class is ___ 2:00 PM.
Score: /10
자주 묻는 질문 (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
관련 동영상
01:14 Tune in on September 3 for our next episode of The Android Show
01:13 Tune in on October 30 for our next episode of The Android Show
07:17 What caused the fall of one of the most influential empires in history? - Mostafa Minawi
전치사 in, on, at 5분 만에 끝내기
올리버쌤
시간 전치사 in on at 구분하는 법
아란TV
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