Here are some ways to say "sorry" in French:

1. Je suis désolé/e — I am sorry
2. Je suis vraiment désolé/e — I am very sorry
3. Désolé/e — Sorry
4. Je regrette — I am sorry
5. Je suis au regret de vous informer — I regret to inform you
6. Pardon — Pardon
7. Pardonnez-moi — Forgive me
8. Excusez-moi — Excuse me

You can choose the appropriate French expression for “sorry” depending on what occurred. The proper kind of error must be chosen in the first step of the situation.