请问12-year old/ 12-years-old/ 12-year-old/ 12 years old这四项有什么不同?
问题描述：
请问12-year old/ 12-years-old/ 12-year-old/ 12 years old这四项有什么不同?
还有就是two-weeks holiday
two weeks'holidays
two-week holiday
two-weeks'holiday
有什么不同?
这几个概念有点混淆
答
带了连词符就不要写复数形式了,这是原则
a 12-year-old
或者12 years old
two-week-holiday 或者
two weeks' holiday