other sentences into passive using modal verbs.

Active voice: CAN She can play a violin. She cannot play a violin. Can she play a violin?	Passive voice: CAN BE A violin can be played by her. A violin cannot be played by her. Can a violin be played by her?
Active voice: MAY I may buy the computer. I may not buy the computer. May I buy the computer?	Active voice: MAY BE The computer may be bought by me. The computer may not be bought by me. May the computer be bought by me?
Active voice: MIGHT Guests might play chess. Guests might not play chess.	Active voice: MIGHT BE Chess might be played by guests. Chess might not be played guests.
Active voice: SHOULD Students should study all lessons. Students should not study all lessons. Should students study all lessons?	Active voice: SHOULD BE All lessons should be studied by students. All lessons should not be studied by students. Should all lessons be studied by students?
Active voice: MUST You must learn the test-taking strategies. You must not learn the test-taking strategies.	Active voice: MUST BE Test-taking strategies must be learnt by you. Test-taking strategies must not be learned by you.
Active voice: OUGHT TO They ought to take the examination.	Active voice: OUGHT TO BE The examination ought to be taken by them.