What a active boy!这句话对吗?为什么用a不用an?

What a active boy!这句话对吗?为什么用a不用an? with,is,the,field,active,playing,interested,football,on,boy,in,a,football 连词组句 Active boy前面加a还是an What a good boy 转同意句 what a clever boy (改为同义句) What a _______ boy . an active boy翻译 boy he what a is busy的连词成句 连词成句；a,what,boy,he,is,friendly(!) What a boy! what a nice boy 改成同义句what a lucky boy he is （ ）（ ）the boy is! What is the boy?同义句What ___the boy ____? what a boy!什么意思 WHAT A LOVELY LITTLE BOY! What a naughty boy是什么意思 What a smart boy!为什么用What what a good boy!这句话可以吗? what a careless boy Robert is!这句话语法对吗