1. Verbs can be classified into several categories including action verbs, stative verbs, transitive verbs, intransitive verbs, linking verbs, helping/auxiliary verbs, modal verbs, regular verbs, irregular verbs, and phrasal verbs.
2. Regular verbs follow a predictable pattern of adding "-ed" in the past tense, while irregular verbs do not follow a predictable pattern.
3. Verbs have different forms including simple, perfect, and progressive that can be combined together.