A special imperative form for the 2pl exists which is not homophonous with any other non-imperative form. This may apply to syntactic constructions or specialized morphemes. See van der Auwera (2008).
<br>For example, in English, the form <i>Go!</i> without any overt subject is only allowed in the 2sg or 2pl imperative. 
<br><br><b>Reference</b><br>
van der Auwera, Johan, Nina Dobrushina, and Valentin Goussev. 2008. Imperative-Hortative Systems. In Haspelmath et al. (2008), chapter 72. Available online at <a href=â€http://wals.info/feature/39â€> http://wals.info/feature/39 </a href>. 

