A special imperative form for the 1pl exists which is not homophonous with any other non-imperative form. This is sometimes called the <b>hortative</b> (van der Auwera et al. 2008). <br>For example, in Icelandic, the 1pl imperative form is the finite, present indicative, but with no overt subject, as in <i>förum</i> ‘go.1pl’. Since Icelandic is not a <i>pro-</i>drop language, this construction only exists in the 1pl imperative. <br> Similarly, in English, the form <i>Let’s go</i> with the cliticized <i>-’s</i>, cannot be used as a 2 person imperative in the same way <i>Let us out of jail!</i> can, so English can be said to have a special form for the 1pl 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>. 
