This is the 844th most frequent Polish word.
usłyszał
"He heard."
Here, 'usłyszał' is used as the past tense of 'słyszeć', meaning 'heard', indicating an action of perceiving a sound.
On usłyszał dźwięk fletu dochodzący z lasu.
He heard the sound of a flute coming from the forest.
'Usłyszałem' denotes the individual's realization or perceiving of the singing sound during their movement.
Gdy przechodziliśmy obok, usłyszałem jak ktoś śpiewał.
As we were passing by, I heard someone singing.
In this case, 'usłyszała' conveys that the action of hearing occurred and enabled the student to respond.