3B1 expresses question about the occasion, in truth expects it not to occur. 3B2 expresses uncertainty, it would or won't happen. 3B3 expects that it'll occur. Stack Trade network is made up of 183 Q&A communities such as Stack Overflow, the biggest, most trustworthy online Local community for developers to https://www.diigo.com/item/pdf/bfknt/wx8j