Many languages use different 2nd person pronouns to express varying degrees of familiarity or respect toward addressees.  These pronouns may be bound or independent.  Consider German, which has <i>du</i> 'you.SG.FAMILIAR,' <i>ihr</i> 'you.PL.FAMILIAR,' and <i>Sie</i> 'you.HONORIFIC,' which does not denote number.

<br><br><b>Reference</b><br>
Helmbrecht, Johannes. 2008. Politeness Distinctions in Pronouns.
In Haspelmath et al (2008), chapter 45. Available online at <a href="http://wals.info/feature/45">
http://wals.info/feature/45</a href>.

