Abstract 1. Introduction 2. Classification of Verbs 3. A Review of Previous Studies 3.1. Analysis of Progressives Based on Underlying Event 3.2. Atelic versus Telic Progressives 4. Problems in Previous Studies 4.1. Problems with Parsons' Analysis 4.2. Problems with Kearns; Analysis 5. A Proposed Analysis 5.1. Theoretical Background 5.2. A Solution to the Problems 5.3. Problems Revisited References