The study of adverbial clauses in Portuguese is related to the fact that the Portuguese speaker may chose between three different structures, i.e. the adverbial clause may contain the plain infinitive, the inflected infinitive or a finite verb form. In the field of Portuguese Linguistics, the analysis of these structures has traditionally been conducted from a Generative Grammar perspective postulating abstract rules and transformations in order to explain the variation between these structures. As a result, focus has been put on purely structural aspects, while conceptual differences have...