Case markers often distinguish between the various arguments of a predicate, such as the Agent and Patient. Three basic types of arguments are generally distinguished: the subject of a transitive clause, the object of a transitive clause, and the subject of an intransitive clause.

<br><br>Some languages use prefixes to express these case markings.  Consider the Krongo construction <i>àpá-ŋ ìʔìŋ <b>á</b>-kùufì</i> 'm.PERF.hit-TR 3SG.m <b>INSTR</b>-baton' for "He hit him with the baton."

<br><br><b>Reference</b><br>
Dryer, Matthew S.. 2008. Position of Case Affixes.
In Haspelmath et al (2008), chapter 51. Available online at <a href="http://wals.info/feature/51">
http://wals.info/feature/51</a href>.
