nar

/nar/

Cases

SingularPluralWhen to use it
nominativenarthe plank bednarlathe plank bedsthe plain dictionary form — the doer of the sentence
genitivenarnıthe plank bed'snarlanıthe plank beds'the owner — whose it is
accusativenarnıthe plank bed (as the object)narlanıthe plank beds (as the object)a specific, known object — whom or what
dativenarğato the plank bednarlağato the plank bedsdirection or recipient — to where, to whom
locativenardaat / in the plank bednarladaat / in the plank bedswhere it is; also having — mende bar, "I have it"
ablativenardanfrom the plank bednarladanfrom the plank bedswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
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
mynarımmy plank bednarlarımmy plank beds
yournarıngyour plank bednarlarıngyour plank beds
his / hernarıhis / her plank bednarlarıhis / her plank beds
ournarıbızour plank bednarlarıbızour plank beds
you all'snarığızyou all's plank bednarlarığızyou all's plank beds
theirnarlarıtheir plank bednarlarıtheir plank beds

The overlap in the last rows is real, not a mistake: narları can mean "his / her plank beds", "their plank bed", or "their plank beds" — context decides.