"on" in American English is mostly used on days (ex. On Monday i will go for a picnic) and when we want to say that something or someone is on top of something (ex. The keys are on the table)
"in" is used when we want to express that something or someone is being inside something (ex. My cat is inside the house) or (The milk is in the fridge)
"at" is used when we want to express that something or someone exists at a certain location (ex. I am at the airport) or when we want to talk about a certain part of the day EXCEPT from morning. For morning we use "in" ( In the morning we will go for swimming). On any other part of the day "at" is used (ex. At noon we will go to the beach)
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