votre, le votre
French for yours is leur.
I'l be yours and yours only is translated 'je serai à toi et seulement à toi' in French.
this could be yours is translated "ceci / cela pourrait être à vous" in French
To write "truly yours" in Ilocano, you can say "tunay a saan" which means "truly yours" in the language.
To say "I'm yours" in French, you can say "Je suis à toi" or "Je suis tout à toi."
Chez toi (literally: at yours)
tout à vous
to write is "écrire" in French.
pareil comme avec le vôtre
Éternellement à toi (or "à vous").
avec
No. Yours is the possessive form. "Your" used in a sentence can refer to a single person as in "this is your car" or when you are talking to a group of people and say "This is your country".