后面为啥不能加名词，all

要看all指代的什么。如果指代的时不可数名词，那么，谓语动词用单数。如：All of the water there is polluted. All of the paper there runs out. 如果指代的时可数名词（那一定是复数名词），则谓语动词用复数。 如：All of the books are worth reading