1. What (clever) boys they are!2. What a (clever) boy he is!3. What clear water it is!3. How clever the boy is!4. How clever a boy he is!5. How fast he runs!what是代词,how是副词。what后面跟复数名词或不可数名词,what a后面跟单数的可数名词。how后面跟形容词或副词, how 后面不能跟a /an+名词,但可以跟形容词+a/an+名词。
温馨提示:答案为网友推荐,仅供参考