Sam is doing his homework(对划线部分提问)doing his homework划线部分PS:如果doing his homework被划线提问,那么我就不知道Sam is doing his homework是现在进行时,那么我回答时到底用What is Sam doing?还是What is

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Sam is doing his homework(对划线部分提问)doing his homework划线部分PS:如果doing his homework被划线提问,那么我就不知道Sam is doing his homework是现在进行时,那么我回答时到底用What is Sam doing?还是What is
Sam is doing his homework(对划线部分提问)
doing his homework划线部分
PS:如果doing his homework被划线提问,那么我就不知道Sam is doing his homework是现在进行时,那么我回答时到底用What is Sam doing?还是What is Sam do?

Sam is doing his homework(对划线部分提问)doing his homework划线部分PS:如果doing his homework被划线提问,那么我就不知道Sam is doing his homework是现在进行时,那么我回答时到底用What is Sam doing?还是What is
is后面的动词要用ing形式,表示进行.
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What is Sam doing?

前者,后者一句句子里同时含了is跟do两个动词,是错误的,只有be doing sth 没有be do sth这种说法

What is Sam doing?