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Grammar reference

Prepositions

Prepositions of Time: In, On, At

In for periods, on for days, at for clock times.

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Explanation

Use in with months, seasons, years and parts of the day, on with days and dates, and at with clock times and exact moments. Omit the preposition before next, last, this and every.

Examples

  • The course starts in September.
  • We meet on Tuesdays at nine.
  • She arrived at midnight.

Common mistakes

  • I will see you on next Friday.

    I will see you next Friday.

    Next and last take no preposition.

  • In the morning of Monday.

    On Monday morning.

    Days take on.

  • The meeting is in 3 pm.

    The meeting is at 3 pm.

    Clock times take at.

More Prepositions

Prepositions of Place: In, On, At

In for enclosure, on for surfaces, at for points.

Dependent Prepositions

Words that require a fixed preposition.

Prepositions of Movement

Into, onto, through, across, along and towards.