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

”完成体和未完成体之间的对立见斯拉夫语。

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

我去查希腊文的动词时，是有里面讲的现在持续式，(Imperfective aspect) 讲的是一个现在开始持续不断的动作。