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?
人气：185 ℃ 时间：2019-12-18 07:58:44
解答
is后面的动词要用ing形式,表示进行.
很高兴为你解答!
老师祝你学习进步!
望采纳,多谢你的问题!^_^
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