English exercises / A2 / Sentence structureTime and place: the pair of rules behind most preposition errors.
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In, on or at (time)
The three narrow from large to small. In takes long periods: in July, in 2026, in the morning. On takes days and dates: on Friday, on 3 May. At takes clock times and points: at seven, at midnight. Read the expression from large to small and the preposition follows.
Read the full explanationIn, on or at (place)
In is for enclosed spaces: in the box, in Lisbon. On is for surfaces and lines: on the table, on the wall, on Oxford Street. At is for points and addresses: at the door, at the bus stop, at number twelve. The same narrowing pattern as with time.
Read the full explanationEnglish prepositions
In, on and at narrow in the same order for both time and place. In takes the largest unit: in June, in Spain. On takes surfaces and days: on the table, on Monday. At takes points: at six o’clock, at the corner. The pattern holds far more often than it is taught to.
Read the full explanationPrepositions in, on, at: worked examples
Five from the set, with the answer filled in and the rule that decides it.
- 01
The film starts at eight o'clock.
Clock times take at: at eight o'clock, at midnight, at half past two.
- 02
I don't like driving at night.
at night, at midday, at lunchtime, but in the morning.
- 03
We usually go to the market at the weekend.
British English says at the weekend; American English says on the weekend.
- 04
The children open their presents on Christmas Day.
on + a named day: on Christmas Day, on my birthday, but at Christmas.
- 05
There's no school on 2 May because it's a bank holiday.
Dates take on: on 2 May, on 31 December, but in May, in December.