The aspectual contrast between perfective and imperfective is found in many Slavic languages.

”完和未完间对立见于许多斯拉夫语。

Imperfective aspect: indicating a present, ongoing, continuous, or recurrent action.The present and the imperfect tense convey this aspect.

我去查希腊文动词时态，确实是有里面讲持续式，(Imperfective aspect) 讲是一个开始持续不断动作。