People were having fun in the pool, swimming or just splashing around.

　　人們在游泳池里或者游泳，或者只是拍打戲水，開心地玩著。

　　He barged in on us while we were having a meeting.

　　我們正在開會，他闖了進來。

　　The children were having fun, chasing each other's shadows.

　　孩子們追逐著彼此的影子，玩得很開心。

　　They were having breakfast when I arrived.

　　我到達時他們正在吃早飯。