为什么six-year-olds 是正确的

为什么six-year-olds 是正确的 the six-year-olds是复数还是单数呀 six-year-old与six-year-olds的区别 five-six-year olds是什么意思与five six-year olds的区别是什么 six years old 和 six- year- old 和 six- year- olds的区别如题 sixteen-year-olds 这种表达正确么? may is six-year-olds这样说对吗? six years old,six-year-old,six-year-olds在用法上有什么区别?有six-years-old的形式吗? sisteen-year-olds的后面为什么要加s 18 - to- 21- year-olds 为什么old加s sixteen-year-olds,old为什么加了s fifteen-year-olds是什么意思? seven-year-olds Twelve-Year-Olds翻译 -----olds are on the lake A.Five-six-year B.Five-six years C.Five six-years D.Five six years为啥选A 这几种年龄的英语表述方法是否正确Most of them were only sixteen.They were mostly sixteen-year-olds.sixteen-year-old是形容词吧?为什么加sThe boy the police arrested was only nine!He was only a nine-year-old.形容词?They are al 2道英语题目 谢谢大家了1.根据首字母填空you are s__ to say so. Jim is ___A.six-year-old B.a six -years-old boyC.six-year-olds C.six years old [ ] are not be allowed to drive .Athere - year-olds Bthere years olds哪个对,主要是理由?