他们在唱歌的英文是：They're singing。
双语例句
1、这些是她的朋友们，他们在唱歌。
Here are her friends. They're singing.
2、每个星期他们都聚在一起唱歌奏乐。
Every week they get together to make music.
3、他们围在火堆四周唱歌。
They clustered together round the fire and sang songs.
4、仔细听的话，你就能听出他们在唱歌。
If you listen very carefully, you can hear them singing.
5、当火车进站的时候，他们在唱歌。
When the train arrived at the station, they were singing.
6、他们在唱歌跳舞。
They are singing and dancing.
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