ıyıq kün

/ɯjɯq kyn/

Cases

SingularPluralWhen to use it
nominativeıyıq künthe Sundayıyıq künlethe Sundaysthe plain dictionary form — the doer of the sentence
genitiveıyıq künnüthe Sunday'sıyıq künlenithe Sundays'the owner — whose it is
accusativeıyıq künnüthe Sunday (as the object)ıyıq künlenithe Sundays (as the object)a specific, known object — whom or what
dativeıyıq küngeto the Sundayıyıq künlegeto the Sundaysdirection or recipient — to where, to whom
locativeıyıq kündeat / in the Sundayıyıq künledeat / in the Sundayswhere it is; also having — mende bar, "I have it"
ablativeıyıq kündenfrom the Sundayıyıq künledenfrom the Sundayswhere 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
myıyıq künümmy Sundayıyıq künlerimmy Sundays
yourıyıq kününgyour Sundayıyıq künleringyour Sundays
his / herıyıq künühis / her Sundayıyıq künlerihis / her Sundays
ourıyıq künübüzour Sundayıyıq künleribizour Sundays
you all'sıyıq künügüzyou all's Sundayıyıq künlerigizyou all's Sundays
theirıyıq künleritheir Sundayıyıq künleritheir Sundays

The overlap in the last rows is real, not a mistake: ıyıq künleri can mean "his / her Sundays", "their Sunday", or "their Sundays" — context decides.