“be based on”与“based on”虽仅一词之差,但语法功能和使用场景截然不同。前者是谓语动词短语,需与be动词(am/is/are/was/were等)连用,构成句子谓语,说明“某物以……为基础”,如“This theory is based on experiments”;后者是过去分词短语,不可独立作谓语,常作定语(修饰名词,如“a report based on analysis”)或状语(说明动作背景,如“Based on results, we adjusted strategy”...