Contents -- Preface -- Introduction -- 1 SYNTACTIC THEORY AND NULL ARGUMENTS -- 1.0. Introduction -- 1.1. Variation and Learnability -- 1.1.1. The Government and Binding Framework -- 1.2. Null Arguments -- 1.2.1. Previous Analyses -- 1.2.2. Zero-Topic Languages -- 1.2.3. A Theory of pro -- 1.3. On Empty Categories -- 1.4. Summary -- 2 NULL ARGUMENTS IN ROMANCE LANGUAGES -- 2.0. Introduction -- 2.1. A Generalization -- 2.2. Pro and Clitics -- 2.2.1. On pro -- 2.2.2. On Agreement -- 2.2.3. Subject Clitics and Object Clitics -- 2.2.4. Base Generation of Clitics -- 2.2.5. Case and θ-Role -- 2.3. On the Non-Existence of the Null Subject Parameter -- 2.4. Free Inversion -- 2.5. Causatives -- 2.6. Summary -- 3 ON CLITIC DOUBLING -- 3.0. Introduction -- 3.1. Subject Doubling -- 3.1.1. Northern Italian Dialects -- 3.1.2. Previous Analyses -- 3.1.3. French Dialects -- 3.1.4. Analysis -- 3.2. Object Doubling and Subject Doubling -- 3.2.1. Structures -- 3.2.2. Case Assignment -- 3.3. Extractions -- 3.3.1. The Facts -- 3.3.2. Summary -- 3.3.3. Previous Accounts -- 3.3.4. C-Chains -- 3.4. A Note on Complex Inversion -- 3.5. A Note on Reflexive se -- 3.6. Summary -- 4 CLITICS AND AGREEMENT MARKERS -- 4.0. Introduction -- 4.1. Subject Cliticization -- 4.1.1. Internal Structure of INFL -- 4.1.2. Verb Raising or INFL Lowering? -- 4.1.3. Coordination -- 4.2. Agreement Markers vs. Clitics -- 4.2.1. Coordination -- 4.2.2. Doubling -- 4.2.3. Extractions -- 4.2.4. Obligatoriness -- 4.2.5. Morphology -- 4.2.6. Conclusion -- 4.3. Historical Speculations -- 4.4. Summary -- Conclusion -- Notes -- Bibliography -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- X -- Y -- Z.