怎样区别forty-years-old 和forty years old

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怎样区别forty-years-old 和forty years old
forty-years-old 和forty years old的区别,用法.顺便举几个列子

前者一般做定语,后面要跟上名词,比如a forty-year-old man.（你打错了,这里的year后面不能加s）,当然,老外有时候也会把这结构直接当名词用,后面那个名词省略,比如 a forty-year-old,就是指一个四十岁的人,性别不详.（这种形式一般中学考试里不会见到）
forty years old只能做表语了,不能做定语.比如He is forty years old.

怎样区别forty-years-old 和forty years old His fatheris is forty-two years old. father is( )forty years old 加介词. forty—two years old翻译 Is there a mother forty years old? He is forty years old.两种 My parents are forty years old对forty years old提问 the( )woman is my aunt A forty years old B forty- year -old 在线等 ! Are you forty years old and fat? He ___(look) like over forty years old mr brown is a chese teacher ___ forty years old. My uncle is more or less forty years old.