What does she do in the morning 和 What is she doing now 前句用 does 后句用is ,为什么?

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What does she do in the morning 和 What is she doing now 前句用 does 后句用is ,为什么?
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What does she do in the morning 和 What is she doing now 前句用 does 后句用is ,为什么?
What does she do in the morning 和 What is she doing now 前句用 does 后句用is ,为什么?

What does she do in the morning 和 What is she doing now 前句用 does 后句用is ,为什么?
1 第一句是一般现在时,主语是三单she,实义动词DO作谓语,疑问句要加助动词does
2 第二句是现在进行时:be +doing sth 主语是SHE,故BE 要用is