Passivisation

Hello. I would like to have your opinion about passivization. As is known, the following (1a) can be transformed into (1b).


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(1a) They believe him to be innocent.
(1b) He is believed to be innocent.

Then, can we do the same operation (2a)? More concretely, can we generate (2b) from (2a)?

(2a) They prefer John swimming.
(2b) John is preferred swimming.

Thank you for your kindness.