- 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|
|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)|
Note that in some varieties of English people say “on the weekend” and “on Christmas”.
- 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?