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

Time

In









On




At





Place

In






On




At





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.


Practice in, on, and at with these tests:

In, On, At Test

In, On, At Test 2
Year
 In 1994
Month
 In September
Season
 In summer
Part of the day
 In the afternoon
In the morning
IN the evening
Day
 On Monday
Date
 On July 5, 2008
Time
 At 6:30 pm
Country
 I live in Canada.
State/Province
 She lives in Texas.
City
 We live in Toronto.
Street
 The school is on King
Street.
Address
 My office is at 15 King Street.

In, On, At

Business English