They are ( ) students.A.thirteen years old B.thirteen-year old
问题描述:
They are ( ) students.A.thirteen years old B.thirteen-year old
C.thirteen-year-old D.thirteen-years-old
求讲解部分.几个单词中的-有没有有什么区别.
year 在什么情况下加S
答
C
thirteen-year-old,用短横连接变成一个单词,而且是形容词,通常作定语,修饰名词,再如:an eight-year-old boy 一个八岁的男孩
thirteen years old,三个单词,通常在be动词后作表语,如:He is thirteen years old.