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In this paper, we propose a uniform motivation for subject case alternations that align with distinctions in tense and aspect and those that align with a distinction between stage- and individual-level predication. We argue that both follow from an economical use of case marking that is made possible by grounding. If the argument function of an event participant can be determined on the basis of information available in the here and now, the use of case marking can be judged redundant and suspended because of economy. [ABSTRACT FROM AUTHOR]

Abstract: The aim of this article is to account for tense/aspect and mood based differential subject and object marking. We propose an analysis in terms of an optimization procedure between two general potentially conflicting constraints, the faithfulness constraint Identify, which requires the A and the P argument to be identified, either by case or by the context, and the markedness constraint Economy, which penalizes case marking. [ABSTRACT FROM AUTHOR]