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修饰一个事物,可以说"athreeyearsoldboy",也可以说"athree-year-oldboy",它们用法上有什么区别吗?three-year-old只能当定语吗?

题目详情
修饰一个事物,可以说"a three years old boy",也可以说"a three-year-old boy",它们用法上有什么区别吗?
three-year-old 只能当定语吗?
▼优质解答
答案和解析
前者不对,three years old 只能当表语
I am three years old .
后者对,three-year-old只能当定语
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