either or是只能有一个成立,比如
Either he or I have to solve the problem.不是他就是我,总之我俩其中一个要去解决这个问题.
Either I or she is wrong.(在做判断题,两人答案不一样,于是)我和她总有一个是错的.
neither nor是两个都不,与both and正好相反.例如
Neither Mary nor her sister is pretty.玛丽和她妹妹都不漂亮.
He could neither read nor write.