It can happen to anyone这事可能发生在任何人身上

今天的几个句子是有关意外事项的：1.Falls happen to everyone sometimes. 人人偶尔都会摔跤。2.Happen to know his name? 碰巧知道他的名字吗？3.What happen to the impurity? 杂质又如何处理呢？