The document discusses different uses of the prepositions "at", "on", and "in" in English. It provides examples of how each preposition is used to indicate location, whether a specific point or place with "at", a surface with "on", or an area or space with "in". A variety of common places and locations are listed as examples for each preposition.

2. AT: “en” (at a point, at a place…)
• I met her at a party.
• She lives at 43, Elm Street.
• He’s at work, not at home.
 At school, at university, at the airport, at the
station, at a bus stop, at the door, at the front, at
the back, at the top, at the bottom, at the exit, at
the entrance, at the doctor’s..

3. ON: “en”, “encima ” (on a surface…)
• The book is on the desk.
• They sat on the floor.
• They hung the picture on the wall.
 On the balcony, on the sofa, on the table, on the
shelf, on the roof, on the ceiling, on the beach, on an
island, on the grass, on the right, on the left, on the
coast…

4. IN: “en, dentro ” (in an area or space…)
• He is in the kitchen.
• He lives in Poland.
• The key is in the top drawer.
• She lives in Baltimore Avenue.
 In the bathroom, in Italy, in Africa, in Paris, in
a park, in a garden, in a box, in a car…
 In / at + shops/buildings: museum, cinema,
supermarket.