In languages like English, predicative adjectives are supported by the copula (or other verb), as in <i>John <b>is</b> tall</i>.<br><br>
A 'yes' value for this property indicates that predicative adjectives can be supported by a copula, regardless of whether Verbal Predicative Adjectives are also possible
(Stassen 2008). 
<br><br><b>Reference</b><br>
Stassen, Leon. 2008. Predicative Adjectives.
In Haspelmath et al. (2008), chapter 118.
Available online at <A href="http://wals.info/feature/118">http://wals.info/feature/118</a href>.