This dissertation is a study of Arguments and Clausal Relations of Pima Bajo within the framework of Categorial Unification Grammar. The theoretical framework explored assumes the existence of three major categories--the Argument Categorizing Element, The Propositional Radical, and the Proposition--and studies the structure building mechanisms which account for those categories. The major categories are taken to be feature-value complexes which combine, via unification, with different type of pronominal forms. It is shown that the notion of arguments as feature-values and the application of a categorial unification grammar accounts for the structure of simple as well as for complex constructions. The final part of the dissertation discusses a phonological algebra which accounts for the linear order of elements.