must be,can be,may be怎么变反义疑问句?

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mustbe,canbe,maybe怎么变反义疑问句?mustbe,canbe,maybe怎么变反义疑问句?mustbe,canbe,maybe怎么变反义疑问句?mustn''tbe,can''tbe,m

must be,can be,may be怎么变反义疑问句?
must be,can be,may be怎么变反义疑问句?

must be,can be,may be怎么变反义疑问句?
mustn't be,can't be,mayn't be