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

为什么12-year-old=12 years old 12 -year-old 和12 years old的区别 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 _____ you 12 years old last year? yes, I _____ 13 years old this year. 改错：The 12-year-old boy is old enough to look after him.The 12-year-old boy is old enough to look after him. I am 12 year old改疑问句和回答 My this year 12 years old怎么读 一个十二岁的女孩翻译这样可以吗?A 12-year old girl或者A 12-year-old girl 请问是an eleven-year-old boy还是an eleven-year old 那首英文劲歌的歌词有ye ye ye ye ye ye请问哪位朋友知道? 请问twenty-year-old和twenty years old的区别什么时候该用twenty-year-old,什么时候该用twenty years old 请问X-year-old和X years old 的区分和具体用法?还有 X－year－olds 请问是he only has an 8-year-old son还是he has only an 8-year-old son? year old,year-old,years old,years-old的区别 请问,“一岁”翻译成英语是one year old还是one years old? 请问,我一岁了,用英语怎么说:one year old ,还是one years old 请问是six-year-old还是six years old还是six-years-old?(这个空签名有个a ) 我今年12岁的英语是什么?I'm___ ___ old this year.