They don't really use that expression like we do in English. A literal translation would be je suis de retour or je suis revenu(e), using the "e" at the end if you're a female.
But if you're just announcing yourself as you re-enter a room, I would probably say me voilà, which translates roughly as "here I am."
Come back in french is : reviens
je reviendrai
In French, you would say "Bienvenue de retour à l'école."
quand est-ce que tu reviens (familiar) quand sera-tu de retour ? (quite formal)
You can say "Je viens de rentrer" in French, which translates to "I just got back."
Come back in french is : reviens
be right back
je reviendrai
elle reviendra
rembourser
This is how u say thank you for getting back in french:''Je vous remercie pour se remettre''.
In French, you would say "Bienvenue de retour à l'école."
où est l'arrière?
Je t'aime
Sur mon dos
yamani
Voulez sortir ?