tennis

/tennis/

Cases

FormWhen to use it
nominativetennisthe tennisthe plain dictionary form — the doer of the sentence
genitivetennisnithe tennis'the owner — whose it is
accusativetennisnithe tennis (as the object)a specific, known object — whom or what
dativetennisgeto the tennisdirection or recipient — to where, to whom
locativetennisdeat / in the tenniswhere it is; also having — mende bar, "I have it"
ablativetennisdenfrom the tenniswhere 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

Owned
mytennisimmy tennis
yourtennisingyour tennis
his / hertennisihis / her tennis
ourtennisibizour tennis
you all'stennisigizyou all's tennis
theirtennisleritheir tennis

There is no plural of this word. The ending would attach like any other — it is the word, not the grammar, that refuses: this is not something Karachay counts.