Off the top of my head, Danish "De" (practically never used), German "Sie", Chinese "您", French "vous", Spanish "usted" are formal ways of addressing someone, especially if one isn't familiar with the addressee. Did English ever have this? It sounds as though Proto-Indo-European might have had this (based on my five examples), but perhaps someone can enlighten me?
![Did English ever have a formal version of "you"?](https://cdn-ak-scissors.b.st-hatena.com/image/square/803a07a7a1a316566e407eafa4d4ae2cba3c3fdb/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fenglish%2FImg%2Fapple-touch-icon%402.png%3Fv%3D5bebfd2a0d06)