请专业人士回答,
问题描述：
请专业人士回答,
为什么是I don’t know if saying that made either of us healthier,but it did feel pretty good.
而不是I don’t know if saying that made both of us healthier,but it did feel pretty good.
答
很简单,因为both只能用于肯定句
这里已经否定前移了,又是对两者的否定,只能用either,不能用neither 和both