although all of the apples (have been tasted),none of them (taste)good.
问题描述：
although all of the apples (have been tasted),none of them (taste)good.
为什么第二个不用tastes?不是说none作主语,谓语动词用单数吗
答
have been done 是现在完成时的被动语态,尽管所有的苹果已经被尝过了,是过去的状态,而且是被尝的,所以这里应该用tasted .
None of 作主语时谓语动词可用单数也可用复数,强调整体时用单数,强调整体中的每一个成员时用复数,这里强调的是一个整体,所以这里是taste