'On' is widely used as a preposition of time. Here are the situations where we use 'on' the most.
We use on with days of the week
On Monday I go to school.
I will go shopping ON Tuesday.
I have a meeting ON Wednesday.
We also use on with special Days so you can say 'ON Christmas Eve we always have a big family dinner.'
'ON New Year's Eve we always drink Champagne.'
You can also ask What did you do ON the weekend?
'ON the weekend I like to go swimming.'
'I always see my friends ON the weekend.'
Watch our video for more examples on how to use 'on' as a preposition of time.