estaban sumando
-they/you were adding
Imperfect progressiveellos/ellas/ustedesconjugation ofsumar.

sumar

Durante algunos años previos a 2013, Treeline había estado comprando muchos equipos usados y las máquinas estaban sumando demasiadas horas de trabajo.
For a few years leading up to 2013, Treeline had been buying lots of used equipment and the machines were getting really houred up.
El Dr. Touré dijo que, por vez primera en los 40 años de historia de ITU Telecom, decenas de miles de personas procedentes de todo el mundo se estaban sumando al evento utilizando toda la serie de tecnologías conectadas.
Dr Touré noted how, for the first time in ITU Telecom's 40-year history, tens of thousands of people from around the world were joining the event using the full range of connected technologies.
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