estaban rellenando
-they/you were refilling
Imperfect progressiveellos/ellas/ustedesconjugation ofrellenar.

rellenar

Estaban rellenando las cabezas de los tornillos que servían para asegurar el cartónyeso en las paredes interiores.
They were putting filler compound over the heads of screws that secured sheetrock to the interior walls.
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