18. Preposition In, On, and At

The final topic is preposition in, on, and at…WHAT IT IS....?
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A preposition is a word or groups of words used before a noun or a pronoun to show place, position, time or method.
 Preposition in usage with periods of times and places. We use:-

at for a PRECISE TIME

in for MONTHS, YEARS, CENTURIES and LONG PERIODS

on for DAYS and DATES

Look at these examples:

I have a meeting at 9am.

The shop closes at midnight.

Jane went home at lunchtime.

In England, it often snows in December.

Do you think we will go to Jupiter in the future?

There should be a lot of progress in the next century.

Do you work on Mondays?

Her birthday is on 20 November.

Where will you be on New Year's Day?

When we say last, next, every, this we do not also use at, in, on.

I went to London last June. (not in last June)

He's coming back next Tuesday. (not on next Tuesday)

I go home every Easter. (not at every Easter)

We'll call you this evening. (not in this evening)