请问twenty-year-old和twenty years old的区别什么时候该用twenty-year-old,什么时候该用twenty years old

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请问twenty-year-old和twenty years old的区别什么时候该用twenty-year-old,什么时候该用twenty years old
请问twenty-year-old和twenty years old的区别
什么时候该用twenty-year-old,什么时候该用twenty years old

请问twenty-year-old和twenty years old的区别什么时候该用twenty-year-old,什么时候该用twenty years old
twenty-year-old “二十岁的”,此词组相当于一个形容词用,只能作前置定语,即只能放在被修饰的词的前面.如 He's a twenty-year-old singer.
twenty years old “二十岁”,此词组只能作后置定语或表语
如 He is singer of twenty years old.(后置定语)
He is twenty years old.(表语)
希望我的回答能够帮到你,

twenty-year-old用在名词前修饰,相当于“二十岁的(某某)”。
twenty years old用在动词后,相当于“(是)二十岁”。

twenty-year-old是一个复合形容词
twenty years是形容词old的状语,表示“多大”
She is a twenty-year-old mother.
She is twenty years old.