kit

/kit/

Cases

SingularPluralWhen to use it
nominativekitthe whalekitlethe whalesthe plain dictionary form — the doer of the sentence
genitivekitnithe whale'skitlenithe whales'the owner — whose it is
accusativekitnithe whale (as the object)kitlenithe whales (as the object)a specific, known object — whom or what
dativekitgeto the whalekitlegeto the whalesdirection or recipient — to where, to whom
locativekitdeat / in the whalekitledeat / in the whaleswhere it is; also having — mende bar, "I have it"
ablativekitdenfrom the whalekitledenfrom the whaleswhere 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
mykitimmy whalekitlerimmy whales
yourkitingyour whalekitleringyour whales
his / herkitihis / her whalekitlerihis / her whales
ourkitibizour whalekitleribizour whales
you all'skitigizyou all's whalekitlerigizyou all's whales
theirkitleritheir whalekitleritheir whales

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