3B1 expresses question around the occasion, indeed expects it not to occur. 3B2 expresses uncertainty, it would or won't materialize. 3B3 expects that it will take place. I almost never see any of your 4 versions pointed out in the original article. All four of those variants are correct. Just https://petskyonline-onlinestrore.blogspot.com/2025/07/top-10-aquarium-essentials-for-new-fish.html