You can either use this as flashcards or as a cards game. Flashcards: use them to teach at, on, in. Cards game: Cut the pictures. Put at in on in three different parts of the classroom. Divide the class into teams. Put all the cards face down on the desk (remember to use the pictures only). One student from each team should pick a picture up and put it under the correct preposition. The student that first accomplishes this wins a point for the team.