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Forming Passives With Modals

Affirmative Form	Object + may, must, can, could, ought to, should + be + verb3
Question Form	Must, may, can, should, might + object + be + verb3 (past participle)

Something must / can / should... be done by someone at sometime.

Active : Our English teacher may give an exam today.
Passive: An exam may be given by our English teacher today.

Active : Thomas has written many books.
Passive: Many books have been written by Thomas.

Active : Do you have to pay the bill before leaving the restaurant?
Passive: the bill have to be paid before leaving the restaurant?

Active   : Juan can give them some information about the job.
Passive  : Some information can be given about the job by Juan.
Passive2: They can be given some information about the JOB by Juan.

Active : You must obey the traffic rules.
Passive: The traffic rules must be obeyed.

Quick Exercise

Put the following sentences into passive voice. (Modals)

1. We may ask him a few questions. 
2. I can manage a motor car.
3. You must inquire the way. 
4. He might give you a chance. 
5. I could show you his house if you would permit me.
6. I should enjoy a sea-voyage.

Answer :

1. A few questions may be asked by him.

2. A motor car can be managed

3. The way must be inquired.

4. A chance might be given.

5. If you permit me his house could be snow.  

6. A sea-voyage should be enjoyed.