This is the 984th most frequent Ukrainian word.
школі
The Ukrainian word "школі" translates to "school" in English (in the dative or locative case).
In this sentence, 'школі' is the locative case of 'школа', meaning 'school', indicating the place where the children are.
Діти займаються спортом у школі.
Children are doing sports at school.
Here, 'школі' is again in the locative case, emphasizing the school as the location of the library.
У школі є велика бібліотека.
There is a large library at the school.
In this sentence, 'школі' refers to the identical concept, being in the locative case, indicating the site of action or study.