究竟是thirty percent of them is water还是thirty percent of them are water 为什么
问题描述：
究竟是thirty percent of them is water还是thirty percent of them are water 为什么
另外 如何判断类似句子中of后面的be是单数还是复数
答
water不可数 是 单数 用is
如果后面是可数名词用are如果是three quaters of fruit is bad还是three quaters of fruit are bad 为什么我觉得就看修饰的名词如果可数 用 is如果不可数 用are