Prepositions are words that show the relationship of nouns or pronouns to other words in the sentence. The relationship can be spatial (where something is), temporal (when something is) or motive (the manner or direction of movement). Prepositions are placed before nouns or the determiner preceding the noun. Below is a list of the more commonly used preposition.

Prepositions of Time 

about           around        after        at             by
during          for               from        since       until

The bananas are in the refrigerator.

Prepositions of Place 

above         against          below          between       in front of
inside       off                   on               next to           under

 The train departs at 5:45 p.m.

Prepositions of Movement

around         from            through                      off                toward         within

A rabid dog ran toward the lake.

Prepositions create many problems for non-native speakers because many times their use does not follow any rules that learners can utilize to master them. They may be specific to the words around them or referred to. For example:

We watch movies in a theater, but on TV.
We visit friends at the hospital, because they are in the hospital.

For more information about prepositionss and their use take a look at

Using Preposition Correctly

Other links for Prepositions
Definition of Preposition
Kinds of Prepositions
List of Prepositions

An explanation and definition of preposition, including the types of prepositions and examples of prepositions–