Prepositions can tell where something or someone is or was. They can also be part of a phrase.
in, between, in front of, on, behind, over, for, under, to, from
The students are playing in the schoolyard.
The football field is between the buildings.
There is a tree in front of the house.
The children are playing on the field.
There are bushes behind the goal.
A girl is running over the field.
An eager boy is shooting the ball to the wrong team.
Run as fast as you can! shouts the boy from the bush.
Examples of phrases with prepositions:
look for, look after
speaking to, speaking about