This is the 16635th most frequent Polish word.
wrócą
"Wrócą" means "they will return" in English.
Here, 'wrócą' is used in future tense to indicate the action of returning to a location.
Wkrótce wrócą do domu.
They will return home soon.
In this sentence, 'wrócą' is again in future tense, showing dependency of returning action on the condition of raining.
Jeśli będzie padać, nie wrócą na czas.
If it rains, they won't return on time.
Here, 'wrócą' is used in a future context within a dependent clause (subordinate) emphasizing the timing of their return.