- at when we are talking about a precise time.
- in when we are talking about months , years, centuries and long periods of time.
- on when we are talking about days and exact days.
Look at these examples:
- I have a meeting at 9am.
- Lisa went home at lunchtime.
- It often snows in December.
- Do you work on Mondays?
- At to indicate the exact position in which a noun is located
- In to indicate that a noun is an inclosed space
- On to indicate that the noun is on surface
Look at these examples
- She is waiting at the door
- She is in another country
- The computer is on the table
- In, On, At – Prepositions of Place Quiz
- Preposition of Place Exercises
- Preposition of Place Exercises PDF
- Preposition in Expressions of Time Exercises
- Preposition of Time Exercises PDF