a three－year－old boy,可以说成a three years old many　thanks!

a three－year－old boy,可以说成a three years old many　thanks! three-year-old boy 这样的前面用a还是an?两种我都看过.. At last the three-year-old boy was____(救） a thirteen-year-old boy的中文翻译 a thirteen-year-old boy=什么? Don’t complain to him.You know he is _____ boy.A.a three-years-old B.an eleven years oldC.an eleven-year-old D.only three year old 为啥? _____(a/an)1-year-old boy _____(a/an)8-year-old boy _____(a/an)11-year-old boy_____(a/an)13-year-old boy a twenty year old boy对还是a twenty years old boy对哪个等于 a twenty-year-old boy? a five-year-old boy还是a five-year old boy a four-year-old boy可以说成a four-year old boy a two－year －old boy two－years－old two years old 这些类似的都怎么区分要有实际例子和意思 是a one-year-old boy还是an one-year-old boy a 11-year-old boy还是an 11-year-old boy in the 1927, the plane wasa. three-meter-high b.three meters higha为什么不对?急!an eight-year-old boy不是和a同理的吗？ 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 a fourteen years old boy 在句子中对吗是a fourteen -year- old boy 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 单句改错How slowly the three-year-old boy is to learn to talk