--- Have you seen Tom and Mary?--- I haven't seen ___ of them.为什么只能填both,不能填either.

问题描述:

--- Have you seen Tom and Mary?--- I haven't seen ___ of them.为什么只能填both,不能填either.
both和either的区别

both指的是两者都,是复数
either指的是一个或另外一个,是单数either后面也是可以跟of,of后也是可以跟代词宾格的复数形式啊,就是这样才混乱啊!老实说,我个人觉得,这里填两个答案都可以,因为这里不涉及到主谓一致或单复数的问题,应该填两个都可以