have to和must怎么变成一般疑问句（是have to不是have）

Question

如题所述

Answer 1

have to 变一般疑问句时在句首加DO
2 把must 提到句首。如

They have to clean the floor . -> Do they have to clean the floor ?
They must clean the floor .-> Must they clean the floor ?

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Answer 2

have to 的一般疑问句 用助动词 do 或者 does 开头。
must 的一般疑问句直接用 must 开头。

例如：Do you have to go now?
Must I go now?

Answer 3

have to 可以看成一个整体，即一个动词，变成疑问句时必须用助动词来提问，和一般的动词一样用法，而must则是一个情态动词，在句子里可以直接放到句首来提问，无须再加助动词。例如：Do I have to get home at nine?我必须要在9点到家吗？/ Must I get home at nine?我必须要在9点到家吗？来自：求助得到的回答

Answer 4

都用take care of my little sister 做情境
Do I have to take care of my little sister? (加在句首助动词do)
Must I take care of my little sister? （把must提前）