five years old 和five-year-old的区别为什么 She is five years old.不能说成She is five-year-old be动词之后可以加形容词啊
问题描述：
five years old 和five-year-old的区别
为什么 She is five years old.不能说成She is five-year-old be动词之后可以加形容词啊
答
five-year-old,"-"连接多个名词用作形容词的,只能用作前置的定于.不能作表语.be动词后面是表语.