In French, you can say "Au revoir" to say goodbye to an adult.
You can say "Au revoir, mon ami" or you can say "Au revoir _______" The blank is the name of your friend.
That is usually "Adiuex" or "Au revoir"
You say "au revoir"
au revoir
au revoir
Au revoir
au revoir
Au revoir.
Au revoir
goodbye is "revoir" or "au revoir" see you soon is "à bientôt"
Au revoir, je pars!orAu revoir, je m'en vais!