How it works 英语 语法有错?How does it work 才对?

How does it work?才是正确的提问方法.
How it works?是一种错误.
因为特殊疑问句的结构是：“特殊疑问词+助动词+主语+动词+其他成分+?”
how it works常见的原因是,这个可以作为一个从句出现于句子中,如
She has studied about the machine,so she can tell us how it works.
这里的"how it works"做的是宾语从句,特殊疑问句做宾语从句时,要保持陈述语序,不添加系动词,因此,会出现“how it works”.
如果还有问题,欢迎追问.