estaban lloviendo
-they were raining
Imperfect progressive ellos/ellas/ustedes conjugation of llover.

llover

¿Estaban lloviendo carros y no me llamaste?
It was raining cars and you didn't call me?
Estaban lloviendo chuzos de punta y, de vez en cuando, se veía un relámpago.
It was raining cats and dogs, and now and then, there was a flash of lightning.
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