In, On, At

The prepositions IN, ON, and AT are used to indicate time and
place. Notice how they are used differently in the following
situations:TimeIn

ear	In 1994
Month	In September
Season	In summer
Part of the day	In the afternoon In the morning IN the evening

On

Day	On Monday
Date	On July 5, 2008

At

Time => At 6:30 pm

Place

In

Country	I live in Canada.
State/Province	She lives in Texas.
City	We live in Toronto.

On

Street =>The school is on King Street.

At

Address => My office is at 15 King Street.

In many languages, there is only one preposition for the above situations. In English there are three. Just remember that in usually indicates the "largest" time or place, and at usually indicates the "smallest" time or place.

Examples:
I live in Canada, on Main street, at 1481.
The wedding is in June, on Saturday, at 5pm.