1、十五的英语是fifteen。

2、fifteen的读音：英[ˌfɪfˈtiːn]，美[ˌfɪfˈtiːn]。

3、[例句]In those days most people left school when they were only fifteen years old.那时候，大多数人上学只上到十五岁。

4、复数：fifteens