you'll regret it
Si tu ne le fais pas maintenant, tu le regretteras toute ta vie.
If you don't do it now, you'll regret it for the rest of your life.
Arrivera un jour où tu le regretteras.
One day, you'll regret it.
Essaye maintenant, sinon tu le regretteras plus tard.
Try it now, or you'll regret it later.
Ne passe pas ta jeunesse à glander ou tu le regretteras plus tard.
Don't spend your youth lazing around or you'll regret it later.
You'll regret that!
Il arrivera un moment où tu le regretteras.
There will come a time when you will regret it.