comprobaban
-they were checking
The word comprobaban is the imperfect form of comprobar in the third person plural.
See the full comprobar conjugation

comprobar

Cada diez minutos, día y noche, comprobaban el pulso.
Every ten minutes, day and night they took his pulse.
Por si lo comprobaban. Quería que me tomaran en serio.
In case they checked it out I wanted them to take me seriously.
Dos equipos de fisioterapeutas comprobaban y personalizaban cada asistencia de acuerdo a las necesidades de los pacientes.
Two teams of physiotherapists checked and customized every aid according to the needs of patients.
Los funcionarios de las Naciones Unidas, antes de facilitar el pase, comprobaban que se cumplieran esos requisitos.
Before delivering the pass, United Nations officers checked that those requirements were met.
Los profesores comentaban los manuales y comprobaban, a través de frecuentes exámenes, que los alumnos los habían asimilado.
The professors used manuals and commented on them and, by frequent exams, checked to see that the students had assimilated the matter taught.
Hatem (34 años de edad) y Mahmoud (23 años) fueron apartados hacia un lado por los soldados mientras se comprobaban sus documentos de identidad.
Hatem (34 years of age) and Mahmoud (23), were taken aside by soldiers and their identity papers were checked.
Antes los carpinteros lo comprobaban así. Echaban el cristal, en las pliegues vertían el agua, y el agua no debía pasar entre el cristal y la pliegue.
Earlier joiners checked it so. Stacked glass, in folds poured water, and water should not proceed between glass and a fold.
Algunos Estados Miembros informaron de que, cuando realizaban inspecciones ordinarias, sus organismos de supervisión también comprobaban la observancia de la congelación de activos impuesta por el Consejo de Seguridad.
Some Member States reported that when their supervisory authorities conduct their regular inspections, they also check compliance with the Assets Freeze imposed by the Security Council.
He estado en Mellunmäki, en Helsinki, para hablar de euroobligaciones, y cuando expliqué lo que eran las mujeres agarraban sus bolsos con fuerza y los hombres comprobaban si todavía conservaban sus carteras.
I went to Mellunmäki in Helsinki to talk about eurobonds, and when I said what they were the women clutched their handbags tightly and the men wondered whether they still had their wallets on them.
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