estaban congratulando
-they/you were congratulating
Imperfect progressive ellos/ellas/ustedes conjugation of congratular.

congratular

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Allí, mientras se estaban congratulando de su escape, vieron, a lo lejos en el horizonte, el elevarse de los veloces tallos, debajo del follaje de los cuales, el hielo y la nieve parecían deshacerse en rugientes torrentes.
Here, as they were congratulating themselves on their escape, they saw far-off on the horizon the rearing of the swift stems, beneath whose foliage the ice and snow appeared to melt away in rushing torrents.
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