a three－year－old boy,可以说成a three years old

a three－year－old boy,可以说成a three years old he is a 6-year-old boy.可以说he is a 6 years old boy吗 a four-year-old boy可以说成a four-year old boy three years old 与 three-year-old 的区别 three-year-old 和 three years old 有什么区别 three-year-old 与 three years old区别 three -year-old 和 three years old有什么区别? three-year-old boy 这样的前面用a还是an?两种我都看过.. 英语翻译Bill is a twenty-year-old young man .Three years ago,whe I am a sixteen-year-old skateboarder.Three years ago I____完型 单项选择Jim is a very clever boy.He is three years old but he le 英语翻译Jimmy was a very clever boy He was only three years old