Prepositions are like little devils that ruin our sentence compositions. They are very sneaky and can bring us into trouble when not use properly. The only thing that can save a person from such misfortune is by practicing REALLY REALLY hard! I found a link that corrected some of my common mistakes in using prepositions. I hope this will help you a lot too! :)
http://158.132.164.193/FYP/html/preposEx.htm
STEPHANIE BERNARDO