what does the old man doing?和what is the old man doing?哪句正确?

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what does the old man doing?和what is the old man doing?哪句正确?
what does the old man doing?和what is the old man doing?哪句正确?

what does the old man doing?和what is the old man doing?哪句正确?
后一句 ,前一句应改为What does the old man do?

后者

后者 例如what are you doing

what is the old man doing?正确 现在进行时的构成是:am/is/are+doing