I-X -- Introduction -- Part I Early Generative Grammar, the Rise of Category C and the Categorization of Subordinating Conjunctions -- 1 Subordination in Early Generative Grammar - Recursiveness -- 2 Complementizers -- 3 Subordinating Conjunctions - A Question of Categorization -- Part II Recent Conceptions of Phrase Structure -- 4 Phrase Structure -- 5 Clause Structure -- Part III Lexical Properties of Complementizers, Prepositions and Subordinating Conjunctions -- 6 Lexical Properties of Complementizers and Properties of Category C -- 7 Lexical Properties of Prepositions -- 8 Subordinating Conjunctions Straddle the Dividing Line between the Lexical and the Functional Universe -- 9 Conclusion -- 10 Bibliography