ive been teaching a good few years now but I have always struggled with those students who are very calculated in their responses. I can deal with immature shouting out etc but I recently moved to a new school and have quite a few characters. Two boys in particular who are very skilled at turning questions round, backchat phrased as a question. It is clearly a deliberate act in order to Ellicit some sort of response. Any suggestions how to deal with such characters?