estuvieron colocando
-they/you were placing
Preterite progressive ellos/ellas/ustedes conjugation of colocar.

colocar

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Estuvieron colocando volantes por toda la ciudad avisando que estaría dando una presentación de la conciencia de Krishna.
Flyers had been put up all over town advertising that I would be giving a presentation on Krishna consciousness.
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owl