ıyık

/ ɯjɯq /

Cases

SingularPluralWhen to use it
nominative ıyık the week ıyıkla the weeks the plain dictionary form — the doer of the sentence
genitive ıyıknı the week's ıyıklanı the weeks' the owner — whose it is
accusative ıyıknı the week (as the object) ıyıklanı the weeks (as the object) a specific, known object — whom or what
dative ıyıkğa to the week ıyıklağa to the weeks direction or recipient — to where, to whom
locative ıyıkda at / in the week ıyıklada at / in the weeks where it is; also having — mende bar, "I have it"
ablative ıyıkdan from the week ıyıkladan from the weeks 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 ıyığım my week ıyıklarım my weeks
your ıyığıng your week ıyıklarıng your weeks
his / her ıyığı his / her week ıyıkları his / her weeks
our ıyığıbız our week ıyıklarıbız our weeks
you all's ıyığığız you all's week ıyıklarığız you all's weeks
their ıyıkları their week ıyıkları their weeks

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