1. AT (Smallest Circle): Use “at” for exact times. Like saying “at 3 PM” or “at midnight.” It’s for when you need to be very specific about a moment. 2. ON (Middle Circle): Use “on” for days and dates. If you’re talking about a particular day, like your birthday or a holiday, say “on.” For example, “on Monday” or “on New Year’s Day.” 3. IN (Biggest Circle): Use “in” for longer times like months, years, or seasons. If you’re talking about something happening in a month, a year, or even in summer,