be kidding (sb.)，这是地道的口语说法。要注意，这个短语一定要用进行时。例句：You must be kidding. 你在开玩笑吧。Are you kidding me? 你在跟我开玩笑吗/你在耍我吗？I was just kidding. 我那只是开玩笑的。
just a jock
I was just joking.
be jokingcrack a joke
