A language's pronominal demonstratives, which replace noun phrases, have different inflectional features than its adnominal demonstratives, which accompany referent nouns.  In Turkish, the proximal demonstrative stem <i>bu</i> appears in both pronominal and adnominal usages, but with different inflections:

<br><br>a) <i>Ali <b>bun-u</b> unut-amÄ±-yor</i> 'Ali <b>this</b>-ACC forget-cannot-PROG' for "Ali is unable to forget <b>this</b>."
<br>b) <i><b>bu</b> gazete yi</i> '<b>this</b> newspaper-ACC' for "<b>this</b> newspaper".

<br><br><b>Reference</b><br>
Diessel, Holger. 2008. Pronominal and Adnominal Demonstratives.
In Haspelmath et al (2008), chapter 42.
Available online at <a href="http://wals.info/feature/42">
http://wals.info/feature/42</a href>.

