3 rules for Prepositions of Time (at, on, in)
The main rules to remember are:
Rule 1 for Prepositions of Time ‘At’
At = an exact point in time
Examples: at lunchtime, at midnight, at noon, at the end of the conference, at three o’clock.
- I arrive at 1 o’clock.
- The meeting is at lunchtime.
- We will finish at dinner-time.
Rule 2 Prepositions of Time ‘On’
On = a day or a date
Examples: on my birthday, on Monday, on 24th March, on Independence Day, on the first day of the semester.
- The match is on Wednesday.
- The shops are closed on Independence Day.
- The conference starts on May 1st.
- The registration is on the first day of the semester.
Remember: it is on Independence Day, on Christmas Eve, on Easter Monday, BUT at New Year, at Christmas and at Easter.
Rule 3 Prepositions of Time ‘In’
In = a period of time
Examples: in the afternoon, in January, in spring, in 2015.
- We met in 2011.
- In summer, we go to our summer house.
- I usually drink tea in the afternoon.
- The school term starts in September.