Is "The dog was bitten by the man" correct?

Why

Samar is keeping the two nouns, "dog" and "man", in the same left-to-right positions they held in the original sentence, which seems like the simplest way to convert it. But the whole point of the passive voice is to swap WHO the sentence is about — the object of the action (the man, who received the bite) moves to the front and becomes the new subject, while the original subject (the dog, who did the biting) moves to the end, after "by". Keeping the same word order while just adding "was ... by" accidentally reverses the actual event: Samar's sentence now says the DOG got bitten, by the man, the opposite of the original meaning. Test: ask the simple question "who or what got bitten in the original sentence?" — the answer is "the man", and that answer needs to become the new subject, at the very front of the passive sentence, for the meaning to survive the conversion correctly. His teacher is right: passive voice moves the object of the action to the front as the new subject — "The man was bitten by the dog" — not simply relabelling the sentence in its original order.