ten years old 和ten-year-old的区别

问题描述:

ten years old 和ten-year-old的区别

ten years old 是短语
ten-year-old 是连字符单词,是形容词
两者有不同用法.例句
The boy,who is ten years old,will be staring high school in September.
The ten-year-old boy will be starting highs school in September.