"Someone is having a good time" 或者 "Someone is having a great time" 表示某人过得愉快。这个短语的来源是源自于英语中的 "good time" 或 "great time"，这两个词组都有 "愉快的时光"、"玩得开心" 的意思。

下面是一些英文例句，以及它们的中文翻译：

She's having a good time at the party. 她在派对上玩得很开心。
They're having a great time on their vacation. 他们在度假时玩得很开心。
We're having a good time at the concert. 我们在音乐会上玩得很开心。
He's having a great time at the beach. 他在海滩上玩得很开心。