他们在唱生日歌。

Tāmen zài chàng shēngrìgē.

They are singing the birthday song.

她很喜欢唱歌。

Tā hěn xǐhuān chànggē.

She really likes singing.

他们在唱中文歌。

Tāmen zài chàng Zhōngwén gē.

They are singing Chinese songs.