【正确答案】正确答案：In the exchanges, the maxim of relation has been flouted. As to instance(1), A will assume that if B is cooperative, his reply must be relevant in a different sense: I will not talk about my secret now because I do not want to let John know. In(2), the answer of B seems irrelevant to A"s utterance. By doing so, A will likely derive the implicature that B has accepted his suggestion , and is going to get prepared. In(3), by violating the maxim of relation, B intends to implicate that Mercedes is an expensive car and he would not drive a Mercedes.