How a cool boy!这个句子哪里错了

网友回答

what 引导名词,包括复数和不可数,可数
what a beautiful day!
what beautiful flowers they are!
what clean water it is!
而how 引导副词形容词.
how beautiful the day is !
how beautiful the flowers are!
how clean the water is!
======以下答案可供参考======
供参考答案1:
应该是What a cool boy!
供参考答案2:
what a cool boy！how 强调形容词。how cool the boy is.
供参考答案3:
应该是 What a cool boy! 或者 How cool a boy is!
供参考答案4:
应该What a cool boy!
供参考答案5:
how 后加形容词或者副词等修饰词，再加名词成分，记住冠词A、AN、THE是名词的标志，所以应该是HOW COOL A BOY/what a cool boy