kefir

/kefir/

Cases

SingularPluralWhen to use it
nominativekefirthe kefirkefirlethe kefirsthe plain dictionary form — the doer of the sentence
genitivekefirnithe kefir'skefirlenithe kefirs'the owner — whose it is
accusativekefirnithe kefir (as the object)kefirlenithe kefirs (as the object)a specific, known object — whom or what
dativekefirgeto the kefirkefirlegeto the kefirsdirection or recipient — to where, to whom
locativekefirdeat / in the kefirkefirledeat / in the kefirswhere it is; also having — mende bar, "I have it"
ablativekefirdenfrom the kefirkefirledenfrom the kefirswhere 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
mykefirimmy kefirkefirlerimmy kefirs
yourkefiringyour kefirkefirleringyour kefirs
his / herkefirihis / her kefirkefirlerihis / her kefirs
ourkefiribizour kefirkefirleribizour kefirs
you all'skefirigizyou all's kefirkefirlerigizyou all's kefirs
theirkefirleritheir kefirkefirleritheir kefirs

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