had been noticing
Past perfect progressive conjugation of notice. There are other translations for this conjugation.

notice

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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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