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Prepositions are words that specify place, direction, and time. There are three types of prepositions. 
1}  Time prepositions,
2} Place prepositions,
3} Direction prepositions,

1} Time prepositions,
Time prepositions define time. Prepositions usually come before a noun or pronoun. Prepositions never come after a verb.

After- I'll be there after work.
Around-  We will be there around 3 PM.
Before-  I'll be there before I go to school.
Between-  I'll be there between 3:00 and 5:00.
By-  I'll be there by the time that you leave for work.
During-  I'll be there during your class.
For-   I'll be there for your birthday.
Past-  I wasn't there for the past 2 months.
Since-  I didn't see her since I was 10 years old.
Until-  I'll not be home until 7:00 PM.
Within-  I'll be there within 2 hours. 



AT                                                               ON                                               IN
a specific time                                    days and date                         period of time ,
                                                                                                                  years, months,
                                                                                                                       seasons
example:
at 2:00                                             on my birthday                            in a few days 
at lunch time                               on the first day                              in a couple 
                                                           of school                                         of months
at 4:00 PM                                 on 11/10/99                                    in the summer

In english we say:
in the morning-      'coz it is considered a period of time,
in the afternoon,
in the evening,
at night

2} Place prepositions,
Place propositions clarify the place, someone/ somebody.  
common place prepositions:
Aboard-  She is abroad the boat.
Above-  The picture is above the sofa.
Across-  My house is across the street.
Against-  The desk is against the wall.
Around-  My house is around the block.
At-  Is youe house at the end of the street.
At the back of-  We are going to sit at the back of the theater.
At the bottom of-  The coins are at the bottom of the lake.
At the top-  The books are at the top of the shelves.
Between-  We sit between the two boys.
Behind-  The gals sit behind the two boys.
Below-   The desk is below the window.
By -   The books are by the door.
In-    I live in the big green and white house.
Inside-  I live inside the big green house.
On the corner of-   We live on the corner of 3rd avenue.
In the middle of-      We live in the middle of the street.
Near-  I don't live near the supermarket.
Next to-  I live next to my best friend.
To the left of-     The blue box is to the left of the green box.
To the right of-      The orange box is to the right of the yellow box.
On-    The sun heater is on the top of building.
On the side of-   There is a big sign on the side of the house.
On top of-    There is a man on the top of the roof.
On the other side of-   Do you see what is going on over there on the other side of the roof?
Opposite-  The post office is on the opposite side of the street.
Outside-  The car is outside the garage.
Under-  The blanket is under the bed in the box.
Underneath- The pen is underneath the box.

3} Directions propositions:
Direction prepositions are used to clarify the direction of someone or somethig .
Examples,
Under,
Over, 
Right,
Left etc.....