what do they usually do改为what are they usually do行不,为什么一定是do

what do they usually do改为what are they usually do行不,为什么一定是do 我是初学,

英语动词分成三种,行为动词 系动词与情态动词.do是行为动词,are是系动词,一个句子只能有一个动词.What do they do的第一个do是助动词无意义,不在动词范围内.第二个是行为动词do.比如说They do homework,因为do是行为动词,所以提问时要用助动词提问,一般提问变成Do they do homework?特殊疑问词提问就变成what do they usually do.而what are they do是明显的语法错误,因为有两个动词在一个句子里.

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