Preface -- Chapter One Background -- 1.1. Introduction -- 1.2. X-bar Theory -- 1.3. Principles of Thematic Structure -- 1.4. Principles of Quantification -- Notes to Chapter One -- Chapter Two Passives and Argument Structure -- 2.1. Passive in GB Theory -- 2.2. An Alternative Proposal -- Notes to Chapter Two -- Chapter Three The By-Phrase and Implicit Arguments -- 3.1. Introduction -- 3.2. Predication and Modification of Implicit Arguments -- 3.3. Referential Properties of Implicit Arguments -- 3.4. Conclusion -- Notes to Chapter Three -- Chapter Four Middles and Nominals -- 4.1. Properties of Middles -- 4.2. Middles and Stativity -- 4.3. Aspectual Classes of Verbs and Transitivity -- 4.4. Middles, Ergatives and Modification -- 4.5. Nominals -- 4.6. Conclusion -- Notes to Chapter Four -- Chapter Five Impersonal Constructions and the Passive in UG -- 5.1. Romance si/se -- 5.2. Middle si/se -- 5.3. The German Impersonal Passive -- 5.4. Conclusion -- Notes to Chapter Five -- References.