depuis ce matin
I've been sitting here since this morning.
Je suis assis ici depuis ce matin.
— Wings of Desire (1987)
Snow has been falling steadily since this morning.
La neige tombe sans discontinuer depuis ce matin.
He has been busy since this morning.
Il est occupé depuis ce matin.
The lines were busy since this morning.
Les files d'attente étaient longues depuis ce matin.
— Train to Busan (2016)
The power has been cut off since this morning.
Le courant est coupé depuis ce matin.
My sister has been studying in her room since this morning.
Ma sœur étudie dans sa chambre depuis ce matin.
I've been very busy since this morning.
Je suis très occupé(e) depuis ce matin.