PREPOSITION in, at, on for time

PREPOSITION

( IN, AT, ON FOR TIME )

* In

          We use in for longer periods such as months, years, and seasons.

     Ex: - in April

            - in summer

            - in 1997

            - in the nineteenth century

            - in the morning / evening

* At

          We use at for times and certain expressions.

     Ex: - at 08.00

            - at lunchtime

            - at christmas

            - at the moment

            - at midnight

            - at the weekend

            - at the same time

            - at the age of a

* On

          We use on for days and dates.

     Ex: - on friday

            - on 12 september

            - on friday morning

            - on saturday evening

# There is no preposition before last, next, or this.

    Ex: - What did you do last night?

           - I'll see you next week.