five-year=old和five years old用法有什么区别啊

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five-year=old和five   years  old用法有什么区别啊
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five-year=old和five years old用法有什么区别啊
five-year=old和five years old用法有什么区别啊

five-year=old和five years old用法有什么区别啊
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.

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

five years old是名词
five-year-old是形容词

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。

没什么区别的
five-year = five years