Prepositions of Place: at, in, on

In general, we use:

at for a POINT
in for an ENCLOSED SPACE
on for a SURFACE

at	in	on
POINT	ENCLOSED SPACE	SURFACE
at the corner	in the garden	on the wall
at the bus stop	in London	on the ceiling
at the door	in France	on the door
at the top of the page	in a box	on the cover
at the end of the road	in my pocket	on the floor
at the entrance	in my wallet	on the carpet
at the crossroads	in a building	on the menu
at the front desk	in a car	on a page

Look at these examples:

Jane is waiting for you at the bus stop.
The shop is at the end of the street.
My plane stopped at Dubai and Hanoi and arrived in Bangkok two hours late.
When will you arrive at the office?
Do you work in an office?
I have a meeting in New York.
Do you live in Japan?
Jupiter is in the Solar System.
The author's name is on the cover of the book.
There are no prices on this menu.
You are standing on my foot.
There was a "no smoking" sign on the wall.
I live on the 7th floor at 21 Oxford Street in London.

Notice the use of the prepositions of place at, in and on in these standard expressions:

at	in	on
at home	in a car	on a bus
at work	in a taxi	on a train
at school	in a helicopter	on a plane
at university	in a boat	on a ship
at college	in a lift (elevator)	on a bicycle, on a motorbike
at the top	in the newspaper	on a horse, on an elephant
at the bottom	in the sky	on the radio, on television
at the side	in a row	on the left, on the right
at reception	in Oxford Street	on the way

Prepositions: In, On, and At (with specific times and places)

The prepositions in, on, and at can be used to indicate time and place. Notice how they are used in the following situations:

Preposition	Time	Place
In	Year, Month, In 1999, In December	Country, State, City In Japan, In Utah, InTaipei
On	Day, Date On Saturday, On May 1	Street On Main Street, On 1st Ave.
At	Time At 8:00, At 7:30	Address At 815 East Main 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:

A: Where's your office?

B: In Taipei, Taiwan.

A: Really? What part of Taipei?

B: It's on Chung Shan North Road.

A: I know that area. Where exactly is it?

B: It's at 105 Chung Shan North Road, next to the bookstore.

C: When is the wedding?

D: It's in June.

C: What day?

D: It's on Saturday, the 25th.

C: What time?

D: It starts at 6:00.

Prepositions with articles and locations

When talking about locations, use at to indicate the general vicinity or area, and in to
indicate inside the building, enclosed area, etc. For example:

at the swimming pool (on site)	in the swimming pool (in the pool itself i.e. in the water)
at the post office/bank (general)	in the post office/bank (inside the building)
at the zoo (visitors, general area)	in the zoo (animals in their cages)
at school	in the classroom

Sample sentences:

I met my wife at the theater. (while watching a movie)

I spilled my drink in the theater (on the floor of the building)

She works at the library on Wednesdays.

She found a rare coin in the library (building).

Dr. Jones works at the hospital every day.

John was in the hospital for a week with a broken leg.

For school, prison, and church, the is used to indicate the building. No article indicates
the general situation. Note the following:

"practice"/situation	building
in school (studying, listening to teacher, etc.)	in the school (building)
in jail/prison (staying there as a criminal)	in the jail/prison (temporary)
in church (praying, listening to a sermon, etc.)	in the church (building)

Where's Dad?

in church (attending services)	in the church (fixing the windows)
at church	at the church
in prison (He committed a crime.)	at the prison (visiting his friend)