six years old,six-year-old,six-year-olds在用法上有什么区别?有six-years-old的形式吗?
问题描述：
six years old,six-year-old,six-year-olds在用法上有什么区别?有six-years-old的形式吗?
答
1.当形容词用 She is a six-year-old girl.
2.当表语 She is six years old.
3.表一类人They are the six-year-olds
没有six-years-old这种形式