Did English ever have a formal version of “you”?
Second person used to be:<p>Singular----|----Plural<p><pre><code>   Thou      Ye, You

   Thee      You

   Thine     Yours

   Thy       Your
</code></pre>
Which correspond to the nominative, objective, and possessive cases accordingly.<p>By the way, the "Ye" is not related to the "Ye" in store signs that say "Ye Olde...". Y was sometimes used by typographers instead of the Old English letter Þ(Thorn),  which makes a "Th" sound, so those store signs should be pronounced as "<i>The</i> Old..."<p>The usage of "You" instead of "Thou" began in the 14th century. It was originally used in token of respect when addressing a superior, and eventually began to be used when addressing equals.<p>EDIT: Removed part about "you all", because some things I said were wrong and others I will have to look up.