çerek

/ tʃerek /

Cases

SingularPluralWhen to use it
nominative çerek the river çerekle the rivers the plain dictionary form — the doer of the sentence
genitive çerekni the river's çerekleni the rivers' the owner — whose it is
accusative çerekni the river (as the object) çerekleni the rivers (as the object) a specific, known object — whom or what
dative çerekge to the river çereklege to the rivers direction or recipient — to where, to whom
locative çerekde at / in the river çereklede at / in the rivers where it is; also having — mende bar, "I have it"
ablative çerekden from the river çerekleden from the rivers 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 çeregim my river çereklerim my rivers
your çeregiŋ your river çerekleriŋ your rivers
his / her çeregi his / her river çerekleri his / her rivers
our çeregibiz our river çerekleribiz our rivers
you all's çeregigiz you all's river çereklerigiz you all's rivers
their çerekleri their river çerekleri their rivers

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