
A 'yes' value indicates that the language has non-finite when clauses. An example is the gerund in English <i>When writing, I try to stay awake</i>. These may or may not be introduced by an overt conjunction such as <i>when</i> (Cristofaro 2008). 
<br><br><b>Reference</b><br>Cristofaro, Sonia. 2008. When Clauses.
In Haspelmath et al. (2008), chapter 126. Available online at <a href=â€http://wals.info/feature/126â€> http://wals.info/feature/126</a href>. 
