Each of them know me know要加s吗?

Each of them know me know要加s吗? do you know them为什么加them he found it important____（let）each of them know what had hap Please let me know that's reall.You mean more to me them 这里的drink为何要加S：IF each of them drinks a cup of coffee in a mo each of them 后加动词复数吗? I know any one of them和I know any of them有什么不同的吗? If anything hanppens to him ,let me know.此处为什么happen 要加s呢? i don't know all of them Neither of them ___(know)the answer. " I know none of them" means "-----------------" I do not know any of them?