What examples of passive voice are there?

The narrator has no emotion or bias in the story. The narrator uses passive voice even during the most emotionally intense moments in the book. The narrator's tone is very "matter of fact" leaving any emotional interpretations to the reader,

The birds did not understand Snowball's long words, but they accepted his explanation, and all the humbler animals set to work to learn the new maxim by heart. FOUR LEGS GOOD, TWO LEGS BAD, was inscribed on the end wall of the barn, above the Seven Commandments and in bigger letters....

Once again the animals were conscious of a vague uneasiness. Never to have any dealings with human beings, never to engage in trade, never to make use of money.....

“Because nearly the whole of the produce of our labour is stolen from us by human beings. There, comrades, is the answer to all our problems. It is summed up in a single word−Man” (Orwell 2).

“Old Major (so he was always called, though the name under which he had been exhibited was Willingdon Beauty) was so highly regarded on the farm that everyone was quite ready to lose an hour's sleep in order to hear what he had to say” (Orwell 1).