at: [clock time] (9:00), noon/midnight (12pm/12am), night, dinnertime, lunchtime..., on: [day of the week] (Sunday), [other days] (Christmas), the weekend, [date] (Sept 10th), in: the morning/ afternoon/ evening, [month] (June), [year] (2015), [season] (the summer),

Prepositions of Time: in/on/at

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