Nobody noticed that,either 为什么用either而不是neither?

Nobody noticed that,either 为什么用either而不是neither? neither either either ,neither neither-either either neither neither either neither nor either or both and 怎么用 too\either\neither怎么用? nobody is perfect ,____.后面填什么?either 还是neither? neither和either的问题 either表示的是两者之一 可为什么not either= 用either.or和neither.nor造句 否定两者是用either还是neither? either of,neither