jelpek

/dʒelpek/

Cases

SingularPluralWhen to use it
nominativejelpekthe sailjelpeklethe sailsthe plain dictionary form — the doer of the sentence
genitivejelpeknithe sail'sjelpeklenithe sails'the owner — whose it is
accusativejelpeknithe sail (as the object)jelpeklenithe sails (as the object)a specific, known object — whom or what
dativejelpekgeto the sailjelpeklegeto the sailsdirection or recipient — to where, to whom
locativejelpekdeat / in the sailjelpekledeat / in the sailswhere it is; also having — mende bar, "I have it"
ablativejelpekdenfrom the sailjelpekledenfrom the sailswhere 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
myjelpegimmy sailjelpeklerimmy sails
yourjelpegingyour sailjelpekleringyour sails
his / herjelpegihis / her sailjelpeklerihis / her sails
ourjelpegibizour sailjelpekleribizour sails
you all'sjelpegigizyou all's sailjelpeklerigizyou all's sails
theirjelpekleritheir sailjelpekleritheir sails

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