Verbal constructions take different numbers of arguments depending on their morpho-syntax context. For example, causative constructions increase the number of arguments, while passive constructions decrease the number of arguments. Nominalization can also affect argument structure in a number of ways. In this talk, I discuss Hawaiian, which expresses argument structure change via productive morphology, including causatives, nominalizers, and passives. I discuss interactions among these morphemes revealed by corpus analysis, and I argue that certain forms which are traditionally considered to be separate morphemes are instead allomorphs, the surface form of which is conditioned by morpho-syntactic context. I model these interactions within the 'syntax all the way down' approach of Distributed Morphology.