请这样思考:
She is such a sweet girl. = What a sweet girl she is!
She is so sweet a girl. = How sweet a girl she is!
She is so sweet. = How sweet she is!
所以
How sweet a girl is! = A girl is so sweet.
这样的句子文法虽然没错 语意却很怪
情境好像是"所有的女生(相较于男生)是sweet的"
但如果a改成定冠词the就说得通
How sweet the girl is! = The girl is so sweet.
词性部分:
what同such一样是形容词(或determiner)
how同so一样是副词
※ 引述《dragon0905 (好学的人)》之铭言：
: 请问:
: What a sweet girl! 可以换句话说,
: How sweet a girl is!还是 How sweet a girl she is!
: 在参考书有看到两种写法，哪一个才是正确的?为什么?
: 谢谢您!