Prepositions and how to use them

Use of Preposition in Graphics

Exercises:

Virtual Exercise on Preposition
http://resources.hwb.wales.gov.uk/VTC/location/eng/Introduction/MainSessionPart1.htm

http://resources.hwb.wales.gov.uk/VTC/location/eng/Introduction/MainSessionPart2.htm

Picture description
http://www.myenglishpages.com/site_php_files/grammar-exercise-prepositions.php