 The grammatical approach certainly does have some virtues. First, we have ample evidence that Aristotle was sensitive to language and the structures inherent in it. So it would not be all that surprising were he led by his sensitivity to linguistic structures to his list of categories. Moreover, some of the peculiarities of his list are nicely explained in this way. Two of the highest kinds are action and passion. In Physics III 3, however, Aristotle argues that in the world there is only motion and that the distinction between action and passion lies in the way in which one is considering the motion. So why should there be two distinct categories, namely action, and passion, rather than just one, namely motion? Well, the grammatical approach offers an explanation: in language, we differentiate between active and passive verbs. Hence, there are two distinct categories, not just one.