will have been building
-habré estado construyendo
Future perfect progressiveconjugation ofbuild.There are other translations for this conjugation.

build

Younger children will simply stack a few objects; as they near 36 months of age, children will have been building increasingly complex structures, and these activities are often intertwined with pretend play.
Los niños más pequeños simplemente apilan algunos objetos unos encima de otros; mientras se acercan a los 36 meses de edad, van construyendo estructuras cada vez más complejas, y estas actividades a menudo se entrelazan al juego de fantasía.
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