1: Introduction.- 1. Towards a Theory of Mixed Categories.- 1.1. Syntactic Categories and Their Projections.- 1.2. Morphology and Syntax.- 1.3. Case.- 1.4. Movement.- 1.5. Complementation versus Relativization.- 1.6. Nominalizations as Clauses.- 1.7. Modularity and Category Theory.- 2. Overview of the Structure of Quechua.- 2: Syntactic Categories and Their Projections.- 1. Nominalized Clauses versus Main Clauses.- 1.1. Features in Common.- 1.2. Differences between Main Clauses and Nominalized Clauses.- 1.3. The Syntactic Distribution of Nominalized Clauses.- 2. Nominalizations and the Syntactic Categories of Quechua.- 2.1. Nominalized Verbs and the Major Categories of Quechua.- 2.2. Projections from Major Categories and X Syntax.- 2.3. Parallels between N and V Projections in Quechua.- 2.3.1. AGR.- 2.3.2. Subjects in N? and V? Projections.- 2.3.2.1. Obligatoriness.- 2.3.2.2. The Distribution of PRO.- 2.3.2.3. Extraction of Subjects out of NP and S.- 2.3.2.4. Subcategorization.- 2.3.2.5. Small pro.- 2.3.2.6. Idioms.- 2.3.2.7. The Assignment of Thematic Roles.- 2.3.3. Is there a Syntactic VP?.- 2.3.3.1. VP can be Negated as a Separate Constituent.- 2.3.3.2. VP Constitutes a Domain for Case Assignment.- 2.3.3.3. Agreement.- 2.3.3.4. Complements of Perception Verbs.- 2.3.3.5. The Case Marking of Adverbs.- 3. Transcategorial Constructions.- 3.1. Review of Analyses Proposed for Transcategorial Constructions.- 3.1.1. Classical Generative Treatments of the English Gerund.- 3.1.2. The NP Dominating S Analysis.- 3.1.3. Recent Work on Transcategoriality.- 3.2. Our Analysis.- 3.2.1. Categoriality and Case.- 3.2.2. A Minimally Revised X System.- 3.2.3. Results for Nominalized Clauses.- 3.2.4. Results for Postpositional Phrases.- 3.2.5. Local Transcategoriality.- 3.3. Lexicalization of Transcategorial Constructions.- 4. Summary.- 3: Morphology and Syntax.- 1. Quechua Nominalizations and Their Morphology.- 1.1. Nominal Morphology.- 1.2. Verbal Morphology.- 1.3. The Morphology olĂ"