We have to be quiet in the library划线提问( be quiet )

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We have to be quiet in the library划线提问( be quiet )
We have to be quiet in the library划线提问( be quiet )

We have to be quiet in the library划线提问( be quiet )
What do we have to do in the library?

What do we have to do in the library?
这句的改法是将划线部分去掉前面加上不定疑问代词What,又因为有实意动词have to所以要加上助动词do

What do we have to do in the library?不要误认为be quiet是由系动词的成分,句子中已经有动词have to了,所以有do提问,把be quiet划去,这是一个动作成分了,所以要用do来代替,前一个do是助动词,后一个是动词

What do we have to do in the library? 是对be quiet都划线的提问。
How do we have to be in the librart?是对仅仅quiet划线的提问。