Resultados posibles:
trastocaba
Imperfecto para el sujetoyodel verbotrastocar.
trastocaba
Imperfecto para el sujetoél/ella/usteddel verbotrastocar.

trastocar

Muchos ecólogos se sientiron visceralmente decepcionados porque se trastocaba su idea cómoda de una naturaleza estable.
Ecologists, many ecologists, were almost viscerally upset because it offended that very comfortable idea that nature was stable.
Palabra del día
la capa