A. in
in a room / in a shop / in a car / in the water
in a garden / in a town / in the city centre / in France
• 'Where's David?' 'In the kitchen.' / 'In the garden.' / 'In London.'
• What's in that box / in that bag / in that cupboard?
• Angela works in a shop / in a bank / in a factory.
• I had a swim in the river / in the sea.
• Milan is in the north of Italy.
• I live in a town but I want to live in the country.
B. at
at the bus stop / at the door / at the traffic lights
at her desk / at the top (of the page) / at the bottom (of the page)
• There's somebody at the bus stop / at the door.
• The car is waiting at the traffic lights.
• Julia is working at her desk.
• Write your name at the top / at the bottom / at the end (of ...):
• My house is at the end of the street.
C. on
on a shelf / on a plate / on a balcony / on the floor etc.
on a wall / on a door / on the ceiling etc.
• There are some books on the shelf and some pictures on the wall.
• There are a lot of apples on those trees.
• Don't sit on the grass. It's wet.
• There is a stamp on the envelope.
also on a horse / on a bicycle / on a motor-bike:
• Who is that man on the motor-bike?
in
in the kitchen
in a shop
in the river
at
at the bus stop
at the door
at her desk
on
on the shelf
on the wall
on the floor