B1said inanswerto something that someone has said,meaningthat you do notbelievethey need said itseriously, or youthinkit is astupidthing to say:
（表示不相信或觉得荒谬）你一定是在开玩笑吧 You've got to bejokingif youthinkI'm going tostandin therainwatchingyouplaytennis!你以为我会站在雨中看你打网球，你准是在开玩笑吧！