Choosing the correct preposition can be tricky in English since there are three different prepositions commonly used in expressions of time: at, in, and on. 

Fortunately, using the wrong preposition of time probably won't lead to misunderstandings, so if you say "at Tuesday" instead of "on Tuesday," people will still understand you. But, students commonly ask us for help with these prepositions, so here is a quick overview!

You can practice using the sentences below!