含有
情态动词的被动语态，如何变成被动语态的一般疑问句？
只要把情态动词调前就可以了。
The sentence can be translated this way.
Can the sentence be translated this way?
Your homework should be finished(by you) at once.
Should my homework be finished at once?-Yes, it should./ No, it shouldn‘t.
This work must be done at once.
Must this work be done at once?-Yes, it must. / No, it needn‘t.
回答应保留原情态动词，但must表"必须"时，其否定回答应用needn‘t，need表"必要"时，其肯定回答应用must。这和主动语态类似。
追问不是把be动词提前吗？
追答不是!
是将情态动词提前。
改成(一般)问句，是把第一个动词提前。
本回答被提问者采纳