Very Beginning:

 

 Prepositions of movement

http://www.learnenglish.de/PictureIt/prepositionmovement.htm

With clip art pictures

 

At, in, on, to

http://esl.about.com/library/beginner/bleasypreps.htm?once=true&

 

Intermediate:

 

English Grammar Online preposition page

http://www.ego4u.com/en/cram-up/grammar/prepositions

Intermediate list with quizzes

 

More Comprehensive List of Preps

https://owl.purdue.edu/owl/english_as_a_second_language/esl_students/prepositions/index.html

Scroll down and look at menu at the left for prepositions sorted by time, space, relationship, etc.

 

 Jennifer's Preposition Pages

http://www.youtube.com/watch?v=EaXTyFtQx9o

http://www.youtube.com/watch?v=G0-Y7-tnDK0&feature=channel

http://www.youtube.com/watch?v=uHmOHhl7saQ&feature=channel

Yes, Jennifer has a video for everything! But these are good for students to view/review points about prepositions on their own

 

 Just for fun: 

 

Grammar Rock YouTube video of common prepositions

http://www.youtube.com/watch?v=ITXrRHBA5OM

Yes, a little young, but classic!