estaban hirviendo
-they/you were boiling
Imperfect progressive ellos/ellas/ustedes conjugation of hervir.

hervir

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Recuerdo como estaban hirviendo un brebaje seriamente.
I recall how they were seriously boiling the concoction.
Los otros miembros de Odd Squad estaban sentados en una mesa redonda y todos tenían rígidas expresiones que parecían sugerir que en realidad estaban hirviendo por dentro.
The other members of Odd Squad were seated about a round table and all of them wore stiff expressions that seemed to suggest that they were actually seething inwardly.
Mientras que las patatas estaban hirviendo, Empecé a hacer la salsa.
While the potatoes were boiling, I started to make the gravy.
Word of the Day
to boil