six-year-old和six years old用法有什么区别?

six years old 和 six- year- old 和 six- year- olds的区别如题 six-year-old和six years old用法有什么区别? six-year-old boy和six years old boy 有什么区别?一样么?为什么? six-year-old与six-year-olds的区别 My little brother is ____.A.a six-years old boy B.a six-year-old boy C.a six-years-old boyD.a six-year old boy 请问是six-year-old还是six years old还是six-years-old?(这个空签名有个a ) 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? Mary,a ___ girl,is standing under the tree.A.six year old B.six years old C.six-year-oldD.six-years-old six years old与six-year-old有什麽区别拜托了各位 his younger brother ,who is ---- ,is in grade oneA six-year-old B six years old C six-year-young D six years young 为什么Six Years Old.中Year要加S呢? Tom is a six-year old school boy. The boy six years old this year.哪里错了 six six six 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 My little sister is only____.A.six years B .six years old C.six year old再问一个：the sign____'danger' A.meaning B.mean C.means