Although the objective of this lesson is to review/ use prepositions, its purpose is really just to get students talking to each other, something which is my personal goal in my school this year. It begins with a simple review of prepositions, in which students fill in a worksheet. Simple enough. Next, they choose a partner and sit opposite each other, with a book in the middle which blocks their view of the other student's work area. They are each given one part of a spot the difference puzzle (see attached files). In order to complete it, they must talk to each other and use prepositions to figure out what the differences are (e.g. 'I see a shark in the water, on the bottom left'.) To help them out, there is a diagram in the powerpoint which guides them through some helpful phrases to get them started. I usually draw this on the board and elicit the labels from the students- I just included it to give you an idea of what I ask them. I find that this helps the weakest students who like to refer to it.If there's time, then there's another task which involves one student describing a picture (see ppt) to his partner. This also makes an excellent and entertaining group task, and the drawings always get laughs.Fell free to suggest any additions/ improvements.P.S. in the prepositions review sheet, 'I' is missing from the picture...