hubieran colapsado
Past perfect subjunctiveellos/ellas/ustedesconjugation ofcolapsar.
Si el nivel de las aguas subterráneas hubiera diminuido demasiado, el terreno turboso entre Leiden, Rotterdam y Breukelen se hubiera hundido y muchos edificios de la zona hubieran colapsado.
If the groundwater level had become too low, the peaty soil between Leiden, Rotterdam, and Breukelen would have settled by compaction, and buildings in the area could have collapsed.
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