“-year-old” “years old”什么时候用“-year-old” 什么时候用“years old”

year old,year-old,years old,years-old的区别 year olds还是years old? eight years old与eight- year-old year-old与years old的区别 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 two - year - old two - years -old two year old two years old 哪两个对》 our english teacher has___son.Aa8-year-old Ban8-years-old Ca8-years-old Dan8-year-old “-year-old” “years old”什么时候用“-year-old” 什么时候用“years old” 数字 years/year old与 数字-year-old的区别 Are you ten years old this year? I ____fourteen years old next year 英语eight years oldeight years old eight-year-old eight-years-old eight-years old有什么不同 twenty-year-old twenty years old 两个怎么用? years old 和year-old的区别和用法 ten years old 和ten-year-old的区别 是FIVE YEAR OLD还是FIVE YEARS OLD thirteen years old与thirteen-year-old的区别 一岁是one year old还是one years old? 急!