in

on

at

no preposition

in the morning/the evening/the afternoon

months (in May)

seasons (in spring)

years (in 2020)

 

days of the week (on Friday)

dates (on the 15th of May)

particular days (on my birthday, on that day, on Christmas day)

time (at 3 o’clock)

at midday/midnight

word time (at that time, at lunchtime/dinnertime)

at night

at the weekend

festival periods (at Christmas/ Easter)

last/this/next week/month/year

Exercises