请问twenty-year-old和twenty years old的区别

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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

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）
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请问twenty-year-old和twenty years old的区别 twenty-year-old twenty years old 两个怎么用? By next year,he ( ) twenty years old. year-old和years old的区别 a twenty-year-old girl 、girl of twenty和girl twenty-year-old有他20岁,是he's twenty year old还是he's twenty years old a twenty year old boy对还是a twenty years old boy对 i am twenty years old与 i have twenty years old区别? 用所给词的适当形式填空：1.I______(be)twenty years old next year. Peter must be twenty years old this year.的一般疑问句 years old 和year-old的区别和用法 ten years old 和ten-year-old的区别