eight-year-old在句中作什么成分使用?我一直想知道eightyearsold和eight-year-old的区别在哪里.我知道eightyearsold在句中作表语使用,既然eightyearsold在句中是作为表语的,那么eight-year-old在句中又是作

Question

eight-year-old在句中作什么成分使用?
我一直想知道eight years old和eight-year-old的区别在哪里.我知道eight years old在句中作表语使用,既然eight years old在句中是作为表语的,那么eight-year-old在句中又是作什么使用的呢?限今天!答得好追分!

Answer 1

eight years old 是表语 只能放在be后面
he is eight years old
eight-year-old 是复合形容词 只能放在名词前面
he is an eight-year-old boy
be动词后面的就是表语