je dois te dire quelque chose
I have to tell you something important!
Je dois vous dire quelque chose d'important !
— Life Is Beautiful (1997)
Guys, I have to tell you something.
Les gars, je dois vous dire quelque chose.
I have to tell you something right now.
Je dois vous dire quelque chose maintenant.
— Divorce Italian Style (1961)
You know, I have to tell you something, Bhai.
Tu sais, je dois te dire quelque chose, Bhai.
— The Big Sick (2017)