arka

/arka/

Cases

SingularPluralWhen to use it
nominativearkathe archarkalathe archesthe plain dictionary form — the doer of the sentence
genitivearkanıthe arch'sarkalanıthe arches'the owner — whose it is
accusativearkanıthe arch (as the object)arkalanıthe arches (as the object)a specific, known object — whom or what
dativearkağato the archarkalağato the archesdirection or recipient — to where, to whom
locativearkadaat / in the archarkaladaat / in the archeswhere it is; also having — mende bar, "I have it"
ablativearkadanfrom the archarkaladanfrom the archeswhere 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
myarkammy archarkalarımmy arches
yourarkangyour archarkalarıngyour arches
his / herarkasıhis / her archarkalarıhis / her arches
ourarkabızour archarkalarıbızour arches
you all'sarkağızyou all's archarkalarığızyou all's arches
theirarkalarıtheir archarkalarıtheir arches

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