At Hours:
- at 7 am
- at 12 o’clock
- at 5 pm
Parts of the day:
- at night
- at noon/ midday
- at midnight
- at bedtime
- at lunch time
- at dinner time
- at dinner
- at lunch
- at sunrise/ sunset
- at dawn
Holidays without “day”:
- at Easter
- at Christmas
- at New Years
At + time:
- at present
- at the weekend (U.K)
- at breakfast
- at the moment
- at this moment
- at the same time
- at that time
IN
Parts of the day:
- in the morning
- in the afternoon
- in the evening
Months:
- in January
- in February
- in December
Seasons:
- in (the) spring
- in (the) summer
- in (the) fall/ autumn
- in (the) winter
Years:
- in 1980
- in 1968
Decades:
- in the 1960s
- in the seventies
Centuries:
- in the 15th century
- in the 21st century
Weeks:
- in a week
- in 2 weeks
Holidays:
- in the Easter holiday
- in the Christmas holiday
Period of time:
- in the past
- in the next century
- in the future
- in the 10 years time
- in the middle ages
- in a few minutes
- in a moment
- in an hour
- in 3 hours
- in six months
- in a year
ON
Days:
- On Monday
- On Thursday
- On Sunday
Dates:
- on April 3rd
- on 1st January 2013
- on the 10th
- on the first day
- on the last day
Holidays with ‘day’:
- on New Year’s day
- on Christmas day
- on Easter day
Specific days:
- on my birthday
- on holiday
- on my wedding day
- on that day
Days + Parts of day:
- on Sunday morning(s)
- on Friday afternoon(s)
- on Monday evening(s)
- on the weekend (U.S.)
- on weekdays
- on time
- on a summer evening
- on a cold day
- on my lunch break
