Time prepositions are words used to indicate when something happens, helping us clearly express time-related ideas. The three most common time prepositions are in, on, and at. We use in for longer periods such as months, years, centuries, or parts of the day (e.g., in July, in the morning). On is used for specific days, dates, and holidays (e.g., on Monday, on Christmas Day). At is used for precise times and specific points in the day (e.g., at 5 p.m., at midnight). These prepositions simplify communication by letting us specify exactly when events occur.
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