This is the 16800th most frequent Polish word.
wyjaśniać
"Wyjaśniać" means "to explain."
The word 'wyjaśnia' here means 'explains,' and it's used in the context of providing clarification or understanding about a specific topic, namely grammar rules.
Nauczyciel wyjaśnia zasady gramatyki.
The teacher explains grammar rules.
In this sentence, 'wyjaśniać' is an imperfective verb form, indicating an ongoing action of clarifying details of the events to the witnesses.
Policjant starał się wyjaśniać świadkom przebieg wydarzeń.
The policeman tried to explain the sequence of events to the witnesses.
Here, 'wyjaśniać' is used to describe the action of resolving or clarifying concerns in a general sense.