apercibieran
-they/you warned
Imperfect subjunctiveellos/ellas/ustedesconjugation ofapercibir.

apercibir

Entonces, nos apoderábamos de ellos por sorpresa sin que se apercibieran.
So We took them by surprise while they perceived not.
Entonces, nos apoderábamos de ellos por sorpresa sin que se apercibieran.
Then We took them by surprise while they did not perceive.
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