Imperfecto para el sujetoellos/ellas/ustedesdel verbodesparecer.

desparecer

Tuvieron la sensación de que sus cuerpos y sus mentes desparecían y que solo eran sentimientos dentro de sensaciones.
They had the impressions that their bodies were disappearing as well as their minds, and that they were but feelings and sensations.
Palabra del día
la medianoche