8-year-old和8yearsold的区别
8-year-old有-这个连字符year单数.不要复数
8yearsold漫游连字符，years是复数的，
8yearsold一般作表语，前面经常接联系动词（be之类的）
8-year-old（注意是year，不是years）一般作定语，相当于形容词
题目：8-year-old 和 8 years old 的区别
8-year-old和8yearsold的区别
8-year-old有-这个连字符year单数.不要复数
8yearsold漫游连字符，years是复数的，
8yearsold一般作表语，前面经常接联系动词（be之类的）
8-year-old（注意是year，不是years）一般作定语，相当于形容词