The document discusses various categories of verbs including person, number, tense, and aspect. It explains that person associates a process with the speaker, addressee, or others. Number shows if a process involves one or more doers. Tense reflects time and expresses the relation between an action and the moment of speaking. Aspect expresses how an action is portrayed as proceeding, such as with continuous or perfective forms. The document also discusses challenges with classifying verbs and analyzing categories like future tense and aspect in English.