Epistemic modality refers to possibility related to available evidence. van der Auwera and Ammann (2008) provide English examples such as <i>John <b>may</b> have arrived</i> and <i>John <b>must</b> have arrived</i>. <br><br> In these sentences, whether or not John has arrived is established based on available evidence.

A ‘yes’ value to this property indicates that the language expresses this sort of modality with an affix. <br><br>For example, in Koasati, the affix <b><i>-sahá:w</i></b> marks epistemic possibility in words like <i>hó:pa:<b>-sahá:w</b>-ok</i> ‘be.sick<b>-POS</b>—SS.FOC’ for ‘might be sick’ (van der Auwera & Amman 2008). <br><br>

<b>Glossing convention:</b> Such an affix will be glossed <b>POS</b>. <br><br>

<b>Reference</b><br>
van der Auwera, Johan & Ammann, Andreas. 2008. Epistemic Possibility.
In Haspelmath et al. (2008), chapter 75.
Available online at <a href=â€http://wals.info/feature/75â€>http://wals.info/feature/75</a href>.	
