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情态动词的被动语态

例：1)主动句：You must hand in your homework this afternoon.

被动句：Your homework must be handed in this afternoon.

2)主动句：I have to do the job myself.588.es

被动句：The job has to be done by myself.

3)主动句：All of us ought to obey the rule.

被动句：The rule ought to be obeyed.(by all of us)