题目内容：

and做连词可以放句首,而且单独成句,相关的例子很多,但为什么but,because,so之类的连词却不可以?
我就举一个例子：All I knew on Air Force One that night was that Nixon seemed relaxed.And I felt that was beneficial.(The Ends of Power by Hadelman)

优质解答

在楼主所列举的几个连词里,唯独and可以承上启下,单独成句；类似的连词的however,只不过它表示了转折的意义.