A language marks the plurality of a noun by adding a suffix to it.  In English, the plural of <i>dog</i> is formed by adding the suffix <i>-s</i>.

<br><br><b>Reference</b><br>
Dryer, Matthew S.. 2008. Coding of Nominal Plurality.
In Haspelmath et al (2008), chapter 33.
Available online at <a href="http://wals.info/feature/33">
http://wals.info/feature/33</a href>.
