estuvieron colocando
-they/you were placing
Preterite progressiveellos/ellas/ustedesconjugation ofcolocar.

colocar

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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