When do you use in, on, and at for time?

Use 'in' for long periods (months, years, seasons, centuries): 'in January,' 'in 2020.' Use 'on' for specific days and dates: 'on Monday,' 'on March 15th.' Use 'at' for precise times and fixed periods: 'at 3 o'clock,' 'at noon,' 'at night.'

When do you use in, on, and at for place?

Use 'in' for enclosed spaces, cities, countries: 'in the room,' 'in London.' Use 'on' for surfaces or lines: 'on the table,' 'on the street.' Use 'at' for specific points or addresses: 'at the bus stop,' 'at 15 Baker Street.'

Is it 'in the morning' or 'at the morning'?

The correct phrase is 'in the morning.' Use 'in' for parts of the day: in the morning, in the afternoon, in the evening. But use 'at' for night: at night.

In vs. On vs. At: Time and Place Prepositions

Quick Answer

IN (large / general)

Time: months, years, seasons

Place: cities, countries, rooms

ON (specific / surface)

Time: days, dates

Place: surfaces, streets

AT (precise / point)

Time: exact times, fixed expressions

Place: exact locations, addresses

Time Prepositions

Preposition	Use for Time	Examples
in	months, years, seasons, centuries, parts of day	in January, in 2024, in summer, in the morning
on	days of the week, specific dates, special days	on Monday, on 15th March, on Christmas Day
at	exact times, fixed expressions (noon, night, midnight)	at 9 o'clock, at noon, at night, at the weekend

IN (time)

in the morning / afternoon / evening
in January / February
in spring / summer
in 1990 / in 2025
in the 21st century
in the past / future

ON (time)

on Monday / Tuesday
on 5th April
on Christmas Day
on my birthday
on weekdays
on New Year's Eve

AT (time)

at 8 o'clock
at noon / midnight
at night
at the weekend (BrE)
at Christmas (period)
at the moment

Place Prepositions

Preposition	Use for Place	Examples
in	enclosed spaces, areas, cities, countries	in the room, in Paris, in France, in the box
on	surfaces, lines (streets), floors, media	on the table, on Main Street, on the 3rd floor, on TV
at	specific points, addresses, institutions	at the bus stop, at 15 Oak Street, at school, at work

Examples

✔I was born in 1995, on a Monday, at 6 am.

✔She lives in London, on Baker Street, at number 221.

✘I'll see you in Monday.

✔I'll see you on Monday.

✘The meeting is on 3 o'clock.

✔The meeting is at 3 o'clock.

Practice

Fill in the gap:

"The concert starts _____ 8 pm _____ Saturday evening." (in / on / at)