what he is doing 和 what is he doing有什么区别?

问题描述:

what he is doing 和 what is he doing有什么区别?

what he is doing 是错的
what is he doing正确
一般疑问句be动词提前那为什么不能是what is him doing?him是宾格,这里要用he主格好的!谢谢您!