He knows enough about art to recognize a masterpiece when he sees it.
这里的不定式to recognize a masterpiece怎么分析?
这是enough....to结构,传统语法都是将to do看成结果或程度状语的;而现代语法某些观点我更认可,认为too....to do和enough..to do这种结构都是不定式to do(这里是to recoginize a masterpiece)仅仅是词组级别修饰语,修饰的就是enough,这样就句式结构变得简单。