主谓一致的一个语法点

白勇主谓一致的一般规则里的第6点讲到当neither A nor B 作主语时谓语单复数形式由B决定。

但是在接下来的第13点则说当neither作主语时谓语动词用单数。

前后矛盾，不知道究竟应该是怎么样的。

请各位大侠帮忙释疑，最好有具体的例子~~谢谢

Neither we nor they want it.(来自AHD的例子),说明由B决定的.
再看两个来自jukuu的例子：
1.Neither menus nor dialog boxes have this immediate property. Each one requires an intermediate step, sometimes more than one.
2.Neither the salemen nor the supervisor has been notified of the sale. 

另外单个neither的用法：
They were not in Shanghai at that time. Neither ( nor ) were we .
They are not from England. Neither ( nor ) is she .
-----
恩，可以说明问题了。

gmat里面暂没有找到neither A nor B做主语的具体例子.