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?

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.

Can farmers be prevented from cutting down trees? 语法么，你就想一般的含有情态动词的被动语态的句子疑问句只把情态动词提前即可。 Can farmers

你要先明白一个道理：当句子中含有情态动词时，变成一般疑问句的时候，必须将情态动词提到句首。
含有情态动词的被动语态的基本结构是：情态动词+be+过去分词
这样的句子改成一般疑问句的时候，基本句式就是这样：情态动词+主语+be+过去分词+...?
eg.
The work must be finished before ten o'clock.
-------...