3B1 expresses question more than the function, in fact expects it not to happen. 3B2 expresses uncertainty, it might or won't happen. 3B3 expects that it's going to come about. I rarely see any of your 4 variations mentioned in the first article. All four of these variants are acceptable. https://petskyonline-onlinestrore.blogspot.com/2025/07/top-10-aquarium-essentials-for-new-fish.html