Active to passive: modal + verb (must/should/may/can/would -> modal + be + past participle)

1. A.
   The pill would not be swallowing by Rover.
2. B.
   The pill would not swallowed by Rover.
3. C.
   The pill would not be swallowed by Rover.
4. D.
   The pill would not be swallow by Rover.

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1. A.
   Pizza can be delivered by him.
2. B.
   Pizza must be delivered by him.
3. C.
   Pizza has to be delivered by him.
4. D.
   Pizza have to be delivered by him.

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1. A.
   The house should be cleaned regularly by us.
2. B.
   The house should be being cleaned regularly by us.
3. C.
   The house should be clean regularly by us.
4. D.
   The house should have been cleaned regularly by us.

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1. A.
   Archived manuscripts can seldom being accessed without clearance.
2. B.
   Archived manuscripts could seldom be accessed without clearance.
3. C.
   Archived manuscripts can seldom be accessed without clearance.
4. D.
   Archived manuscripts are seldom able to be accessed without clearance.

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1. A.
   The artifact may well be reinterpreted by historians after new evidence emerges.
2. B.
   The artifact may have been reinterpreted by historians after new evidence emerges.
3. C.
   The artifact will be reinterpreted well by historians after new evidence emerges.
4. D.
   The artifact could well be reinterpreting by historians after new evidence emerges.

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1. A.
   Honorary degrees might have been conferred upon exceptional scholars by the university.
2. B.
   Honorary degrees may be conferred upon exceptional scholars by the university.
3. C.
   Honorary degrees may have conferred upon exceptional scholars by the university.
4. D.
   Honorary degrees must be being conferred upon exceptional scholars by the university.

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