3B1 expresses doubt more than the function, without a doubt expects it not to happen. 3B2 expresses uncertainty, it'd or may not materialize. 3B3 expects that it's going to happen. I seldom see any of your 4 versions talked about in the original post. All 4 of such versions are https://bookmarksoflife.com/story5944927/the-basic-principles-of-best-aquarium-shops-dubai