Does he do his homework?还是Does he his homework?

问题描述:

Does he do his homework?还是Does he his homework?
有了does ,为什么还要重复一遍do呢?

第一个does是疑问句的前置用法.
后边的do his homework是动词加宾语结构,做的内容.
缺少do 的话,这句话就是错误的.