For "finished":
* Fait (masculine)
* Faite (feminine)
* Faits (plural)
* Faites (plural)
For "completed":
* Terminé (masculine)
* Terminée (feminine)
* Terminés (plural)
* Terminées (plural)
For "cooked":
* Cuit (masculine)
* Cuite (feminine)
* Cuits (plural)
* Cuites (plural)
For "over":
* Fini (masculine)
* Finie (feminine)
* Finis (plural)
* Finies (plural)
You would choose the appropriate word based on the specific situation and what "done" means in that context.