题目内容：

the student always have fun singing English songs.为什么是singing

优质解答

singing English songs你可以当作状语,主语重复时可以动词ing形式充当状语,还原状语从句就是The student always have fun when he(she)sings English songs.另外,如楼上所述,have fun doing sth.意思做某事很开心....