你的理解完全正确!
How clever a boy he is! --》How clever the boy is!=What a clever boy he is!
How +形容词+ a +名词+ 陈述语序句
How+形容词或副词+ 陈述语序句
What +名词+ 陈述语序句
What+a+形容词+名词+ 陈述语序句
What+ 形容词+复数名词+ 陈述语序句
What+ 形容词+不可数名词+ 陈述语序句
How clever a boy he is!
How lovely the baby is!
What noise they are making!
What a clever boy he is!
What wonderful ideas (we have)!
What cold weather it is!
感叹句的省略形式为:
What a clever boy (he is)!
He is a clever boy.(用两种方式改成感叹句)
1.What a clever boy he is!!
2.How clever a boy he is!!
确实有问题
应该说
How clever the boy is!
或
What a clever boy he is!
正确的应该是How clever he is!
或what a clever boy he is !
boy是宾语
he是主语
属于感叹句句型