When there is a door, I don't know if they closed it or not. I'm not their mom. Maybe they did; maybe they did not. But when there is no door, I can say with

When there is a door, I don't know if they closed it or not. I'm not their mom. Maybe they did; maybe they did not. But when there is no door, I can say with certainty that it was never closed because it doesn't even exist.