USING IN

in a building in a room in a box
in a town/city in a country in a garden

• Is there anything in the box / in the bottle / in the envelope.
• What have you got in your hand / in your mouth?
• We went to Spain, and spent a week in Madrid, (NOT “at Madrid”)
• Heidi’s grandfather lives in a cottage in the mountains.
• Some girls were swimming in the pool / in the ocean / in the river.

USING AT

•X at the door at the window at the bus stop at the train station
at the top / bottom of the page
at the end of the street /path /road…

• Who is that man standing at the train station / at the door / at the window?
• Turn right at the stop sign / at the shopping mall / at the roundabout.
• Write the tile at the top of the page.
• Write the page number at the bottom of the page.
• My house is the green one at the end of the street.
• When you leave the hotel, please leave your key at reception.

USING ON

• We sat on the floor / on the ground / on the grass / on the table / on the embankment.
• There’s a red spot on the door / on the ceiling / on your cheek / on your shirt.
• Have you seen the notice on the blackboard / on the wall / on the door?
• The cinema guide is on page fifteen.
• There’s a lable on the bottle.
• We were stuck on the island / on the roof.

Compare in and at
• There were many people in the cinema, it was really crowded.
BUT…
•  Go down this road and turn left at the cinema.

 Compare in and on
  • There is still plenty of milk in the bottle. 
BUT…
  •  There is a label on the bottle.

Compare at and on
  • I think I heard somebody at the door.
BUT…
  •  There is a sign on the door. It says “No entry”.