Prepositions of Time: In, At, On
Mastering prepositions of time is essential for clear communication in English. This comprehensive guide will help you understand when to use in, at, and on correctly. Designed for A2-level learners, we provide simple explanations, practical examples, and helpful tips to boost your grammar skills.
Pro Tip: Prepositions of time tell us when something happens. Think of them as time markers that help organize events in relation to each other.
1. IN
We use IN for:
Long periods of time:
in 2024, in 1998 (years)
in July, in December (months)
in summer, in winter (seasons)
in the 21st century (centuries)
Parts of the day:
in the morning, in the afternoon, in the evening
in night (We say “at night”)
Future time (“after now”):
I’ll call you in 10 minutes.
She’s coming back in a week.
2. ON
We use ON for:
Specific days and dates:
on Monday, on Friday (days of the week)
on April 15th, on the 1st of May (dates)
Special days and occasions:
on my birthday, on New Year’s Day
on Christmas Eve, on graduation day
With “day” words:
on the weekend (American English)
on the first day of school
3. AT
We use AT for:
Exact times:
at 3:00 PM, at half past seven
Short/fixed times:
at breakfast, at lunchtime, at night
Holidays (without “day”):
at Christmas, at Easter
Fixed phrases:
at the moment, at present
at the same time
at the weekend (British English)
Ready to test your knowledge?
Practice what you’ve learned with our interactive exercise!
Try the Exercise NowImportant Notes & Exceptions
“In time” vs. “on time”:
We arrived on time (at the planned time).
We arrived in time (before it was too late).
“At night” vs. “in the night”:
I sleep at night (general time).
I woke up in the night (a specific night).
British vs. American English:
UK: at the weekend
US: on the weekend
Summary Table
| Preposition | Used For | Examples | Common Mistakes |
|---|---|---|---|
| IN | Long periods, future time | in July, in 2025, in 5 minutes | on July |
| ON | Specific days, dates | on Monday, on May 1st | in Monday |
| AT | Exact times, short periods | at 9:00, at night | on night |
Final Tips
• IN → Big, general time (years, months, future)
• ON → Specific days (dates, special occasions)
• AT → Exact/short times (hours, night, holidays)
Practice regularly and pay attention to how native speakers use these prepositions!