must, have to
Dev'esserlo.
It must be.
— Fa' la cosa giusta (1989)
Dev'esser buio.
It must be dark.
— Mommy (2014)
Miharu dev'essersi svegliata qui.
Miharu must have woken up here.
— Il buco (2019)
Tom dev'essere più specifico.
Tom needs to be more specific.
Dev'essersi trascinato fin qui.
He must have dragged himself all the way here.
— Aguirre, furore di Dio (1972)