Grammar rules:
We use:
''at'' for a specific time of day:
at 5 o’clock
at night
at lunchtime
''on'' for specific days and dates:
on Monday
on 25th May
on Christmas Day
on Friday morning
''in'' for months, years, and long periods:
in January
in 2023
in the morning
in the 18th century
in the past / in the future
We do not use ''at,'' ''on,'' or ''in'' before words like last, next, every, this:
I’ll see you next Friday (not on next Friday)
They got married last March
Vocabulary:
• at (preposition): used for a specific time (e.g., at 8:00)
• on (preposition): used for a specific day or date (e.g., on Monday)
• in (preposition): used for longer periods of time (e.g., in January, in 2024)
• weekend (noun): Saturday and Sunday
• lunchtime (noun): the time when people usually eat lunch
• sunset (noun): the time the sun goes down
• afternoon (noun): the time from 12 p.m. to around 6 p.m.
• moment (noun): a very short time
• century (noun): 100 years
• future (noun): the time after now