had been noticing
Past perfect progressiveconjugation ofnotice.There are other translations for this conjugation.

notice

Parents became involved by letting us know that their children had been noticing cracks and holes everywhere!
Los padres de familia empezaron a participar en el proyecto al informarnos que ¡sus hijos notaban grietas y hoyos en todas partes!
For some time I had been noticing a man standing by a table where four men sat.
Desde hacía un rato, yo estaba observando a un hombre de pie junto a una mesa ocupada por cuatro individuos.
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