In = Period of Time, Year, Season, Month, Part of Day
- I went to school in the past.
- I went to school in the summer.
- I went to school in 1974.
- I went to school in March.
- I went to school in the morning.
On = Specific Day, Specific Day + Part of Day
- I went to school on March 10th.
- I went to school on Tuesday.
- I went to school on Tuesday afternoon.
- I went to school on the morning of March 10th.
At = Specific Time, Specific Time + Day
- I went to school at 10:00.
- I went to school at noon yesterday.
- I went to school at noon.
- I went to school at two o’clock.
Animation by Koon Wei Ho
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