English learners everywhere are confused about prepositions. We’re going to explore how the prepositions AT, ON, and IN are used with TIME and PLACE.

Prepositions Made Easy: In, On, and At
Prepositions of Place: at, in, on

Prepositions of Time: at, in, on

at, in, on – Prepositions in expressions of time – Exercise
Agendaweb.org: Prepositions of time
at, in, on – Prepositions of place– Exercise
Agendaweb.org: Prepositions of place