有一读者问： 有这样一个句子：
But of what human import is all this skill, all this effort, all this energy in the production of effects, when the story, the representation of life is hollow, stupid, banal, childish.
为什么主句与从句中的谓语动词都是单数形式？
主句的谓语动词用is，是因为主语all this skill, all this effort, all this energy...皆指一个概念（注意all this energy前无and）；从句谓语动词用is,是因为主语是单数名词story, the representation 是一同位语。
