This is the 2784th most frequent Spanish word.
mostraba
"Mostraba" means "was showing" or "used to show" (imperfect tense of the verb "mostrar").
In this sentence, 'mostraba' signifies an action of showing or displaying something in the past, often as a repeated action or ongoing in the past.
Ella me mostraba una foto antigua.
She was showing me an old photo.
Here, 'mostraba' is used to convey the idea that the teacher displayed or expressed interest during a certain period in the past.
El profesor mostraba interés en el proyecto de los estudiantes.
The teacher showed interest in the students’ project.
In this context, 'mostraba' works to indicate that the screen exhibited or outputted an error message previously or at some point in the past.