我想问一下ten-year-old和ten year old有什麼不同啊,为什麼它们要加-呢

我想问一下ten-year-old和ten year old有什麼不同啊,为什麼它们要加-呢 ten years old 和ten-year-old的区别 英语中时间的表达什么时候用破折号ten-year-old 和ten years old Lucy is a _____girl.A.ten years B.ten-years-old C.ten-year-old D.ten old哪项正确啊?说出原因.ten years old和 ten-year-old 有什么区别啊？ a ten years old boy和a ten-year-old boy哪个对?为什么?回答者：绝恋の鱼 - 魔法师 四级 可以说he is a ten years old Are you ten years old this year? She is ten year old汉语是什么 Sally was ten yeas old this year A Ten-year-old Teacher的答案A Ten-year-old Teacher的阅读答案 I'm ------ ,and I have ------ sister.A.fifteen-year-old;a ten-year-old B.fifteen years old;a ten-years-oldC.fifteen years old;a ten-year-old D.fifteen year old;ten years old 英语中时间的表达什么时候用破折号,在英语填空中经常遇到ten-year-old 和ten years old的区别 I was ten years old last year.作肯定和否定回答,还有对划线部分提问.划线部分为ten years old 请问怎么用比如：ten year old 我见过有些选择题是这样的 Ten--years--old Ten--years--olds Ten--year--olds Ten--year--old Ten years old Ten years olds Ten year olds Ten year old我见过有些英语是这样的,请问这个 Ten year o ( )Eddie is a_______boy.A.a ten-year-old B.a ten-years-old C.ten years old When her mother died,she was only a girl of ____________.A.ten-year-old B.ten years old C.ten years of age D.ten year-old 10.Mr.Black has a ___.A.ten year old boy B.ten -years old boy C.boy of ten year old D.boy of ten Lucy is a __girl from America.A,ten-years-old B,ten-year-old ten-year-old ten years old’s的区别,具体怎么用,