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Prepositions

Prepositions of time and dates:

• At,on,in:

certain common uses

at 7:00,at a time, at midnight,at night,at Easter,at Christmas....

on a day,on Friday,on 10th March,on Christmas day

on the night of 10th March.

in a period,in the evening,in December,in 1983,in summer.

At,by,till/until: 

at 7.00 means at that time exactly.

          EX: dinner will be served at 7.00.

by 7.00 means either at that time or more usally ,at some time before it.

         EX:I was ready by 7.00

till/until 7.00 means from a certain time to 7.00.

         EX:I 'll be working till 7.00.

         EX:I will be here until my mother comes .

on time,in time:

on time means at the right time.

    EX:the plane left on time.

in time means not late.

    EX:we'll be in time for the show.