sinon ils… / ou bien ils…
So just don't get any fatter or they'll eat you!
Alors, ne grossis surtout pas davantage, sinon ils te mangeront !
— Spirited Away (2001)
Or they'll break down the door.
Sinon, ils enfonceront la porte.
— The Irony of Fate, or Enjoy Your Bath! (1976)
And don't make any noise, or they'll send us away.
Et ne fais pas de bruit, sinon ils nous feront partir.
— The Thief (1997)
Tell Mother to leave the cash, or they'll kill me.
Dis à maman de laisser l’argent liquide, sinon ils me tueront.
— Happy as Lazzaro (2018)
Il faut qu’on parte, sinon ils vont parler.
— Raise the Red Lantern (1991)
Don't forget, or they'll smell.
N’oublie pas, sinon ils sentiront mauvais.
— Memories of Murder (2003)
I have to go now or they'll find me.
Je dois partir maintenant, sinon ils me retrouveront.
— Life Is Beautiful (1997)