cumuş

/ dʒumuʃ /

Cases

SingularPluralWhen to use it
nominative cumuş the errand cumuşla the errands the plain dictionary form — the doer of the sentence
genitive cumuşnu the errand's cumuşlanı the errands' the owner — whose it is
accusative cumuşnu the errand (as the object) cumuşlanı the errands (as the object) a specific, known object — whom or what
dative cumuşha to the errand cumuşlağa to the errands direction or recipient — to where, to whom
locative cumuşda at / in the errand cumuşlada at / in the errands where it is; also having — mende bar, "I have it"
ablative cumuşdan from the errand cumuşladan from the errands 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 cumuşum my errand cumuşlarım my errands
your cumuşung your errand cumuşlarıng your errands
his / her cumuşu his / her errand cumuşları his / her errands
our cumuşubuz our errand cumuşlarıbız our errands
you all's cumuşuğuz you all's errand cumuşlarığız you all's errands
their cumuşları their errand cumuşları their errands

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