depuis ce matin
Rani, you haven't eaten anything since morning.
Rani, tu n’as rien mangé depuis ce matin.
— Queen (2014)
It's been raining since morning.
Il pleut depuis ce matin.
We had been waiting since morning, but he didn't come after all.
Nous l’attendions depuis le matin, mais finalement, il n’est pas venu.
She has been practicing the piano since morning.
Elle pratique le piano depuis ce matin.