estuvieron formulando
-they/you were formulating
Preterite progressiveellos/ellas/ustedesconjugation offormular.

formular

Tanto en foros públicos como en sesiones privadas que se desarrollaron mientras duró su asamblea en el corazón de Silicon Valley, los líderes políticos estuvieron formulando la estrategia.
In public forums and closed-door sessions at their meeting here in the heart of Silicon Valley, party leaders are formulating strategy.
Además, haré mención de la observación de cómo estuvieron formulando esta pregunta, a medida que estuvieron buscando esta respuesta fueron capaces de encontrar aquello que buscaban.
Also, I will make mention of the observation that as you were formulating this very question, as you were seeking for this answer you were able to find that which you sought.
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