This is the 13497th most frequent Spanish word.
regresan
"They return" or "they come back."
In this sentence, 'regresan' is used to indicate a habitual action in the present, describing the students going back home after classes daily or regularly.
Los estudiantes regresan a sus casas al terminar las clases.
The students return to their homes after finishing classes.
Here, 'regresan' is part of a conditional-structured sentence, where the subject performs the action upon a certain temporal occurrence.
Cuando los exploradores regresan de su expedición, comparten sus hallazgos.
When the explorers return from their expedition, they share their findings.
In this example, 'regresen' is in the subjunctive mood, expressing a wish or hope about the action in question.