Theorie:

Study the information about the prepositions of place.

1. We use the preposition in in these situations.

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

Look at these children swimming in the sea.
  
shutterstock_737882242.jpg
 
2. Study the examples with at.

At the bus stop
At the door
At the window
At the top
At the bottom
At the end

Write your name and surname at the bottom of the page.
 
shutterstock_553811536.jpg
 
3. Remember the examples with on.

On the floor
On the ground
On the beach
On the wall
On the shirt
On the page

You will find the text on page 11.