had been forming
Past perfect progressiveconjugation ofform.There are other translations for this conjugation.

form

The sight of aerowright Sana's empty workstation dissolved any spirit of comradery that had been forming between the fair winners.
El taller vacío que había ocupado la aerocreadora Sana disipaba cualquier espíritu de camaradería que se hubiera formado entre los ganadores de la Feria.
Meanwhile, the electron pair that had been forming the alkene-metal complex shifts to form an outright bond between the zirconium and one of the propylene carbons.
Entre tanto, el par electrónico que había participado del enlace alqueno-complejo metálico se desplaza para formar un enlace entre el zirconio y uno de los carbonos del propileno.
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