işek

/ iʃek /

Cases

SingularPluralWhen to use it
nominative işek the doubt işekle the doubts the plain dictionary form — the doer of the sentence
genitive işekni the doubt's işekleni the doubts' the owner — whose it is
accusative işekni the doubt (as the object) işekleni the doubts (as the object) a specific, known object — whom or what
dative işekge to the doubt işeklege to the doubts direction or recipient — to where, to whom
locative işekde at / in the doubt işeklede at / in the doubts where it is; also having — mende bar, "I have it"
ablative işekden from the doubt işekleden from the doubts 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 işegim my doubt işeklerim my doubts
your işegiŋ your doubt işekleriŋ your doubts
his / her işegi his / her doubt işekleri his / her doubts
our işegibiz our doubt işekleribiz our doubts
you all's işegigiz you all's doubt işeklerigiz you all's doubts
their işekleri their doubt işekleri their doubts

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