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Prepositions of Time and Place: In, On, At (A2)

The prepositions in, on and at are used for both time and place, and each has its own rules. This lesson organises them clearly so you stop guessing and start using them correctly.

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Prepositions of Time: In, On and At

For time, use in with months, years and longer periods, on with days and dates, and at with exact times. The same three words also locate places by container, surface or point.

In, on and at are the three prepositions that cover most of what you need to say about when and where. They are short, extremely frequent, and almost never translate directly from another language, which is why they cause so much trouble even for learners who are otherwise confident.

The good news is that both the time system and the place system follow the same underlying logic: in for the largest, most enclosed unit, on for a surface or a specific day, and at for a precise point. Once you see that in a year and in a country work the same way, the two sets stop feeling like separate lists to memorise.

There is also a small set of fixed expressions that break the pattern — at night, on time, in the end — and these simply have to be learned as vocabulary. They are few enough to handle, and they appear constantly, so they stick quickly once you notice them.

Eight small drawings of a ball and a box: in shows the ball inside, on shows it resting on top, under below, behind partly hidden by the box, in front of overlapping the near edge, next to beside it, between two boxes, and above floating over it.
This is the one piece of grammar that genuinely is a picture, and translating it is what goes wrong: no two languages cut space up the same way. The time prepositions on this page behave the same way — in a month, on a day, at a time — a nesting that is much easier to accept once you have seen the spatial version it came from.

How to form In, On and At

The same size logic governs both time and place: in is largest, at is most precise.
PrepositionTimePlace
inmonths, years, seasons, long periodscountries, cities, enclosed spaces
in — examplesin May, in 2019, in summer, in the morningin France, in Madrid, in the kitchen
ondays and datessurfaces and lines
on — exampleson Monday, on 5 June, on my birthdayon the table, on the wall, on the second floor
atclock times and precise pointsspecific points and addresses
at — examplesat six o'clock, at midnight, at the weekendat the station, at home, at 15 Mill Road

In, On and At: the key rules

  1. Time: in for long periods (months, years, seasons), on for days and dates, at for clock times.

    in July, on Monday, on 4th May, at 6 pm, at night

  2. Place: in for enclosed spaces, on for surfaces, at for points and addresses.

    in the kitchen, on the shelf, at the bus stop

  3. Learn the fixed expressions: at the weekend, at Christmas, in the morning, on my birthday.

    See you at the weekend, probably on Sunday morning.

  4. No preposition before last, next, this, every.

    I saw her last week. We leave next Monday.

When to use In, On and At

Prepositions of Place: In, On and At

Think about the shape of the space: a container, a surface, or a single point.

in — inside something

Enclosed spaces of any size, from a box to a country.

in the box, in the room, in Warsaw, in Europe

on and at — surface and point

On for surfaces and lines; at for a precise location or an activity-based place.

on the floor, on the river, on page 12 — at the door, at work, at the bus stop

In, On and At in example sentences

In, On and At in a real conversation

Nearly every line contains both a time and a place preposition — check the size logic each time.

Karim:What time does the workshop start on Saturday?

Lea:At nine, in the main hall.

Karim:Is that in the old building?

Lea:Yes, on the third floor. The lift is at the end of the corridor.

Karim:I'm usually away at the weekend, but I'll be in town in June.

Lea:Perfect. I'll put your name on the list.

Common mistakes (and how to fix them)

Check yourself: 10 In, On and At questions

Answer these and see the reason for each one. They are 10 of the 60 exercises in the full In, On and At practice set.

  1. The meeting is ___ Tuesday morning.

    • on
    • at
    • by
    • in
    Show answer

    on — A named day, even with a part of the day attached, takes on.

  2. The shop closes ___ night.

    • in
    • at
    • on
    • by
    Show answer

    at — At night is an exception to the in the morning pattern.

  3. She lives ___ Greece.

    • to
    • on
    • in
    • at
    Show answer

    in — Countries and cities take in.

  4. We waited ___ two hours in the rain.

    • until
    • since
    • during
    • for
    Show answer

    for — For introduces a length of time.

  5. There's a good café ___ the station.

    • opposite
    • in front
    • against
    • along of
    Show answer

    opposite — Opposite means facing something across a space.

  6. Which sentence is correct?

    • I'll see you to Monday.
    • I'll see you on Monday.
    • I'll see you in Monday.
    • I'll see you at Monday.
    Show answer

    I'll see you on Monday. — Days of the week take on.

  7. My birthday is ___ the fourteenth of May.

    Show answer

    on — A specific date takes on.

  8. Everything you need is ___ the blue folder.

    Show answer

    in — Something enclosed inside another thing takes in.

  9. The chemist is ___ the bank and the bakery.

    Show answer

    between — Between is used with two things on either side.

  10. There's a small park ___ to our building.

    Show answer

    next — Next to means immediately beside something.

Practise In, On and At today

Group your practice by preposition rather than by sentence — the pattern is what you are learning.

  1. Write your weekly schedule using on for days and at for times.
  2. Describe where ten objects are in your home, choosing in, on or at each time.
  3. Complete these: ___ Monday, ___ July, ___ six o'clock, ___ the weekend, ___ night.
  4. Write four sentences that contain both a time and a place preposition.

In, On and At: frequently asked questions

Is it at the weekend or on the weekend?

Both are correct, and the difference is regional. British English says at the weekend; American English says on the weekend. Neither will cause misunderstanding anywhere. Choose the one matching the variety of English you are learning and stay consistent, particularly in exams, where consistency reads better than mixing the two.

Why is it at night but in the morning?

This is a genuine irregularity with no satisfying logic behind it. In the morning, in the afternoon and in the evening all follow the pattern, and then at night breaks it. Treat at night as a fixed expression to be memorised. Note that in the night also exists but means during a particular night, as in I woke up in the night, which is a different meaning.

When do I use no preposition at all?

Drop the preposition before next, last, this, every and tomorrow or yesterday: I'll see you next Monday, not on next Monday. Similarly, We met last year and I work every day take no preposition. This is a very common error because the time expression feels as though it needs one, but adding it is always wrong in these cases.

What is the difference between in and at for a building?

At refers to the building as a location or as an activity, while in refers to being physically inside it. I'm at the cinema means you are there watching a film; I'm in the cinema emphasises that you are inside the physical space. With at school, at work and at university, the meaning is about the activity rather than the walls, which is why those expressions are so common.

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