had to / were supposed to
Ils ont appelé le psychiatre et ont demandé ce qu'ils devaient faire.
They called the psychiatrist and asked what they should do.
Ils savaient qu'ils devaient combattre ensemble pour défaire l'ennemi commun.
They knew they had to fight together to defeat their common enemy.
They were supposed to leave this morning.
— Maman, j'ai raté l'avion ! (1990)
Ils devaient être en train de lire ou alors ils s'étaient endormis.
They must have been reading, or else they had fallen asleep.
— Die My Love (2025)
Mais ils devaient tous savoir.
But they all had to know.
— Wake Up Dead Man : Une histoire à couteaux tirés (2025)