Polish verbs are inflected according to gender as well as person and number, but the tense forms have been simplified through elimination of three old tenses (the aorist, imperfect, and past perfect). The so-called Slavic perfect is the only past tense form used in common speech. In Polish, one distinguishes between three tenses (present, past and future; however, when considering the aspect of the verb, one could detect five tenses, not six, since present perfect forms do not exist in Polish), three moods (indicative, imperative and conditional) and three voices (active, passive and reflexive). Aspect is a grammatical category of the verb, and almost all Polish verbs have two distinct forms, one imperfective and one perfective. A few verbs have two imperfective forms, where the imperfective aspect subdivides into either the indeterminate and determinate aspect (chodzić - iść - pójść (to go)) or the actual and frequentative aspect (pisać - pisywać - napisać (to write)). The perfective verb form is usually an imperfective verb changed with prefixation (robić - zrobić (to make; to do)), suffixation (kichać - kichnąć (to sneeze)), stem alternation (oddychać - odetchnąć (to breathe)) or very rare infixation [5]. A few verbs show suppletion in their aspect formation, like brać - wziąć (to take).

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