This is the 12830th most frequent Spanish word.
oyendo
"Hearing" or "listening."
The word 'oyendo' is used here as the present participle of 'oír', indicating that the act of hearing is currently happening.
Estoy oyendo una bonita canción.
I am listening to a beautiful song.
Here, 'oyendo' describes the action the teacher was engaged in while another action occurred.
Oímos al profesor cuando estaba oyendo un anuncio importante.
We heard the teacher when he was listening to an important announcement.
In this sentence, 'oyendo' is used to describe an ongoing action that the subject was performing.