Abstract
In this article the author proposes to use the Czech National Corpus to investigate the use of the factual imperfective in comparison with the perfective aspect in a very specific context, but at the same time frequent, because of common use: ráno jsem vstával (a) vs vstal (a) 'the / this morning I got up'. The results show that the perfective is used predominantly in sequences of events and the factual imperfective in argumentative discourses (in both cases in the measure of 80%).
While the exceptions are functional for the imperfective in the narration, the presence of the perfective in the argumentative contexts appears random and testifies to the existence of a "gray area" in which the aspects are almost interchangeable.
