four-year-old和middle-aged 杠表示是什么?

four-year-old和middle-aged 杠表示是什么? four-year-old和four year old有什么不同 only four year old意思 This is a ___boy.He can't look after himself.A.four-years-old B four-years-olds C,four-year-old D four year old 一直分不清有连字符和没有连字符的区别 a four-year-old boy可以说成a four-year old boy four-year-old为什么year不用复数形式 This____girl is so lovely.A.four years old B.four-years-girl C.four-year-old D.six-months-old my father is---------- (four) year old后面是单数 although和BUTHE CAN DRAW VERY WELL（）HE IS ONLY A （）BOYA THOUGH FOUR-YEAR-OLD B BUT FOUR-YEARS-OLDC ALTHOUGH FOUR-YEARS-OLD此题最多2个答案.说出答案时要写为什么这个答案 four-year 和four years有什么区别? Tim is four years old.His father works in a middle school and 11 year old和11-year-old有什么区别 My nine-year-old daughter,Maria,is in Year Four.怎么翻译 英语翻译还有,“他四岁”是说he is four years old还是he is four year old? 请问:是a four years old boy?还是a four year old boy?正确要肯定的 my gaughter four years old这句是不少is?等与my four-year-old daughter?Thank you! This is a_boy.He can't look after himself A,four-years-old.B.four-years-olds,C,four- year-old为什么 I want to take 8 o'clock train.这句话对吗?为什么不用在8和o'clock中间加连接线（象four-year-old boy似的）