to let me know
Well, you could have warned me.
Aurais-tu au moins pu me prévenir ?
Could you at least have warned me?
Il fallait me prévenir avant d'ouvrir votre gueule.
You should have warned me before opening your mouth.
— Dans ses yeux (2009)
I have just been warned.
Ben, tu aurais pu me prévenir.
Well, you could have warned me.
Tu aurais dû me prévenir à l'avance.
You should have warned me in advance.
Pour me prévenir que Pignon s'était suicidé !
To let me know that Pignon had committed suicide!
— A Pain in the Ass (1973)