Your first two examples are completely wrong. And the verb sing is a transitive one. you have actually changed he sings a song to a song is sung by him .
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AnonymousI have transformed the above sentences into passive without changing of meaning. Now, I need your opinion about this matter.My opinion is that you need to focus on more useful exercises if you want to learn English. These transformations are not at all practical for learning authentic English. English speakers don't say such things as "Laughter is