Prepositions can be a bit nebulous to second language learners. Yet they do a lot of heavy lifting when it comes to meaning. So in many cases, it’s important to get it right. Here is a very short activity that requires the participants to complete the questions with the correct preposition. BUT after the exercise is complete, you can use the questions for a general discussion…double whammy.
Also, if as a teacher you need to get your head around explaining prepositions, this Khan academy presentation breaks it down a little. This is not material I would use with a student, but I thought it was interesting to freshen up my grammar knowledge and get a bit of the method behind the preposition madness. So to speak.