Prepositions of Time - at, in, on

Rules

  • at for a PRECISE TIME

  • in for MONTHS, YEARS, CENTURIES and LONG PERIODS

  • on for DAYS and DATES

PRECISE TIME

MONTHS, YEARS, CENTURIES and LONG PERIODS

DAYS and DATES

at 3 o’clock

in May

on Sunday

at 10.30am

in summer

on Tuesdays

at noon

in the summe

on 6 March

at dinnertime

in 1990

on 25 Dec. 2010

at bedtime

in the 1990s

on Christmas Day

at sunrise

in the next century

on Independence Day

at sunset

in the Ice Age

on my birthday

at the moment

in the past/future

on New Year’s Eve

Expressions

at

in

on

at night

in the morning

on Tuesday morning

at the weekend*

in the mornings

on Saturday mornings

at Christmas*/Easter

in the afternoon(s)

on Sunday afternoon(s)

at the same time

in the evening(s)

on Monday evening(s)

at present

  • Note that in some varieties of English people say “on the weekend” and “on Christmas”.

Examples

  • I have a meeting at 9am.

  • The shop closes at midnight.

  • Jane went home at lunchtime.

  • In England, it often snows in December.

  • Do you think we will go to Jupiter in the future?

ref englishclub

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