HI Alexander! Your first one is totally fine. “Would it be possible that there were people here who had never seen this?” - this is technically, grammatically ok. But, we would normally use "could" rather than "would." In the third one, it would read better like this: “There should be a rule here whereby certain people had permission to do so” For the final one, it is debatable if we use an 's' for more than one fruit. As an American, I never use 's' with fruit, even if there are 1000 pieces of fruit. :)