five-year=old和five years old用法有什么区别啊
问题描述：
five-year=old和five years old用法有什么区别啊
答
five years old是名词
five-year-old是形容词
答
一个是形容词：five-year-old ，并且year不能加s。
一个是短语：five years old ，这是year是个名词，要加上s。
英语中很多用hyphen隔开的词都是形容词。
答
没什么区别的
five-year = five years
答
前者是附和名词作定语修饰另一个名词
如 He is a five-year-old boy.
特点是 加了连字符不加s
后者是系表结构里的表语
如 He is five years old
特点是 没有连字符要加s
答
前者用于名词前面修饰 后者相当于表语吧
例 he has a five-year-old son.
his son is five years old.