The paper offers an analysis of selected uses of the Polish perfective and imperfective in the non-past indicative and in the imperative construction. In uses under consideration, both the perfective and the imperfective refer to a single complete occurrence of a telic process and, hence, the semantic contrast between them is not a matter of distinctions such as boundedness/unboundedness, completion/non-completion, telicity/atelicity, punctuality/durativity, etc. The paper presents a qualitative analysis of selected corpus examples which is aimed at elucidating the nature of the relevant contrast. The claim advocated in the course of the discussion is that the perfective/imperfective contrast may play a role in the system of clausal grounding in Polish, as it may convey the idea of, respectively, epistemic and/or effective non-immediacy/immediacy of the profiled process relative to the ground.
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