Prepositions...

Preposition of place (at, on, in)
Part 1: Uses of at, in, and on
 In: We use in to specify that a noun (object, person etc) is inside.

Examples:
- Where is your father? He’s in the kitchen.
- Who is in the room?
- Brian was swimming in the ocean.
- Bogota is in Colombia.
.
 At: We use at to refer to a “general” location.

Examples:
- Maria is at the window talking on the phone.
- Juan is at the table with his girlfriend.
- Please read the paragraph at the top of the page.
- The restaurant is at the end of German Avenue.
 On: We use on when we want to say that an object or person is on the surface of another object.

Examples:
- Your books are on the shelf.
- Don’t put your hands on my head.
- There is an orange on the table.
We always say : on a horse, on a bike (bicycle) , on a motorcycle and we usually say on a plane.


   I hope i've helped!!  By Fabio.