Imperfective verbs may be durative, iterative, or frequentative
Durative: Alena jde do skoly. - Alena is going to school (jiti - to be going- immediate continuous action) Iterative: alena chodi do skoly. Alena goes to school = Alena is a pupil (choditi to g ohabitually) Frequentative: alena chodiiva do cirkusu (chodivati - to go accasionally, irregularily, or rather ofter)