This is the 767th most frequent Czech word.
probíhá
"Probíhá" means "is taking place" or "is in progress."
In this sentence, 'probíhá' is used to indicate an ongoing process or activity, specifically the reconstruction work occurring in the school.
V naší škole probíhá rekonstrukce.
Reconstruction is taking place in our school.
Here, 'probíhá' emphasizes the active progress of preparations currently happening toward an event.
Probíhá důkladná příprava na zítřejší konferenci.
Thorough preparation for tomorrow's conference is underway.
This usage of 'probíhá' shows continuity and that the discussion has not yet concluded.