sixteen year old、sixteen-year-olds、sixteen-year-old有什么区别
问题描述：
sixteen year old、sixteen-year-olds、sixteen-year-old有什么区别
答
先看例子：1.He is sixteen years old.
2.They are sixteen --year---olds.
3.He is a sixteen--year---old boy.
例2 中 sixteen --year---olds是名词 例3中sixteen--year---old 是定语