中文：我只是在开玩笑。
英文：I'm just kidding（常用）
还可以这样表达： I'm just joking. 或者I was only kidding.
例句：
1.看看你我只是在开玩笑。Look at you!I was just playing.
2.嘿，回来啊！我只是在开玩笑！Hey, come back! I was just kidding!
