the six-year-olds是复数还是单数呀

the six-year-olds是复数还是单数呀 为什么six-year-olds 是正确的 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 fifteen-year-olds看做单数还是复数? -----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 six years old 和 six- year- old 和 six- year- olds的区别如题 may is six-year-olds这样说对吗? 改为被动语态 They have read the book three times.we should allow six-year-olds to choose their own clothes. 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? five -year- olds像这样的泛指做主语谓语动词用单数还是复数?哎,到底是复数还是单数啊,纠结中 16-year-olds 与the+形容词的区别 Craig创办的 the twelve twelve-year-olds怎么翻译 fifteen-year-olds是什么意思? seven-year-olds Twelve-Year-Olds翻译 everybody, that is ,except his six-year-old daughter这句话that is 怎么理解? six-year-old 为什么不用复数?是合成词?///////////////////////////////////// 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