caş

/ dʒaʃ /

Cases

SingularPluralWhen to use it
nominative caş the boy caşla the boys the plain dictionary form — the doer of the sentence
genitive caşnı the boy's caşlanı the boys' the owner — whose it is
accusative caşnı the boy (as the object) caşlanı the boys (as the object) a specific, known object — whom or what
dative caşha to the boy caşlağa to the boys direction or recipient — to where, to whom
locative caşda at / in the boy caşlada at / in the boys where it is; also having — mende bar, "I have it"
ablative caşdan from the boy caşladan from the boys where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
my caşım my boy caşlarım my boys
your caşıng your boy caşlarıng your boys
his / her caşı his / her boy caşları his / her boys
our caşıbız our boy caşlarıbız our boys
you all's caşığız you all's boy caşlarığız you all's boys
their caşları their boy caşları their boys

The overlap in the last rows is real, not a mistake: caşları can mean "his / her boys", "their boy", or "their boys" — context decides.