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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.

the animated image to identify expressions of time

Animation by Koon Wei Ho

Back to Prepositions

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