estuvimos construyendo
-we were building
Preterite progressive nosotros conjugation of construir.

construir

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Durante 20 años, estuvimos construyendo edificios como este porque no teníamos ni idea de cuánto los detestaban.
For 20 years, we were producing buildings like this because we had no idea how much you hated it.
Y en los últimos años, estuvimos construyendo estas nuevas tecnologías que se basan en el seguimiento ocular.
And so in the past many years we've been building these new technologies that are based on eye tracking.
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