Are you doing your homework?为什麽不能用Do you doing...

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Areyoudoingyourhomework?为什麽不能用Doyoudoing...Areyoudoingyourhomework?为什麽不能用Doyoudoing...Areyoudoingyou

Are you doing your homework?为什麽不能用Do you doing...
Are you doing your homework?为什麽不能用Do you doing...

Are you doing your homework?为什麽不能用Do you doing...
因为do是助动词,没有实际意义.它置前的情况下后面的动词必须用动词原形.但are和doing在一起表示正在的意思.

Are you doing your homework?
是正确的表述,意思是:你正在做家庭作业吗?

Do you doing...? 是错误的句型,因为助动词do后面要接动词原形,比如:
Do you have a sister?
祝你学习进步,更上一层楼!请记得采纳,谢谢!(*^__^*)

进行式就一定要用Be动词作助动词,这是英语语法的规定,没有什么特别号解释的地方