estuvimos concentrando
-we were concentrating
Preterite progressive nosotros conjugation of concentrar.

concentrar

Es muy difícil para mí describir nuestra música; cuando estábamos haciendo el álbum nos estuvimos concentrando en hacer música que sentíamos que contenía atmósfera y sentimiento.
It's very hard for me to describe our music, when we were making the album we were concentrating on making music which we felt contained atmosphere and emotion.
Word of the Day
to light