If I understand you correctly, you think that 1. and 4. sentences are transformed from passive to active?
Well, I have wrote them from book and they seem to me already in passive, and what I did is just applied little extension by puting pronoun in 4. sentence and in 1. sentence I thought that I should just modified it with puting nominative of mi fili.
They are indeed already in the passive voice. Really, there’s nothing left to be done with them - at least if the exercise told you to convert them into the passive voice. Maybe they are trick questions - maybe the exercise hopes to confuse you?