你可以理解为是固定用法,加了连词符号就不加s
这样的用法就是可以吧eleven-year-old整体当成一个形容词放在名词前面作修饰语,如果不加连词符号,也就是eleven years old就只能做表语放在谓语之后了,总之,有连词符号就没有s,有s就没有连词符号
Frank is an eleven-year-old American boy
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