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How to use prepositions of time? (at, in, on) ➪ Use at with times of day, including mealtimes, bedtime, etc. • EXAMPLE: at 3 o’clock, at 10.30 am, at noon, at dinnertime, at bedtime, at sunrise, at sunset, at the moment ➪ Use in with months, seasons, years, decades, centuries and long periods of time in general. • EXAMPLE: in May, in the summer, in 1990, in the 1990s, in the 20th century, in the Ice Age, in the past/future. ➪ Use on followed by days and dates. • Example: on Sunday, on Tuesday mornings, on 6 March, on 25 December 2010, on Christmas Day, on Independence Day, on my birthday, on New Year’s Eve I’m going to drop quiz about prepositions of time in the evening.