an 8 years old boy an 8 years old boyan 8-year-old boy 哪句对?我对第一种结构混淆了 可以做定语吗?

he is an 8 years old boy 为什么不对 an 8 years old boy an 8 years old boyan 8-year-old boy 哪句对?我对第一种结构混淆了 可以做定语吗? _____(a/an)1-year-old boy _____(a/an)8-year-old boy _____(a/an)11-year-old boy_____(a/an)13-year-old boy This is an 8-year-old boy.That girl is 7 years old . 为什么不能说 a 8 years’old boy? a boy is fourteen years old Have you heard the news?An ____ boy was hurt in tje traffic accident.A.eight-years-old B.eight years old C.eight-year-old D.eight-years old说明原因 Lily is ____ girl.A.a 8-years-old B.an 8-year-old C.an 8-years-old D.a 8-year-old l saw __boy playing football in the garden.A.a 8 years old B.a 8-years-old C.an 8 year old.D.an 8-yaer -old The _ boy is Tom's brother.A 8-year old B 8 years old C 8year old D 8 years' old 请说明理由不知为什么 When I was 16 years old,a boy gave me an important gift.It was a smil.怎么翻译 a twenty year old boy对还是a twenty years old boy对哪个等于 a twenty-year-old boy? Mary is( )girl.A.an 8 year old B.8 years old C.the 8 years old D.an 8-year-old选择 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 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? 1、be careful ____ _____ ____ (not play)with matches.2、Simon is an _____ boy .it means he is ____ A.18 years old;18 years old B .18-year-old;18 years old C.18 years old;18-year -old D.18-year-old;18-year-old Mike is a _____school boy.A five years old B five--- years -- old C.five--- years old a fourteen years old boy 在句子中对吗是a fourteen -year- old boy