Prepositions indicate a relation between things mentioned in a sentence. Commong prepositions in English are on, above, below, before, after etc.. Prepositions come in a number of varieties but here we will discuss just place and time.

Place

[Some prepositions of place]{}

in

between

around

on

next to

under

left

right

in front

behind

Time

[Some prepositions of place]{}

after

before

now