pianino

/pianino/

Cases

SingularPluralWhen to use it
nominativepianinothe upright pianopianinolathe upright pianosthe plain dictionary form — the doer of the sentence
genitivepianinonuthe upright piano'spianinolanıthe upright pianos'the owner — whose it is
accusativepianinonuthe upright piano (as the object)pianinolanıthe upright pianos (as the object)a specific, known object — whom or what
dativepianinoğato the upright pianopianinolağato the upright pianosdirection or recipient — to where, to whom
locativepianinodaat / in the upright pianopianinoladaat / in the upright pianoswhere it is; also having — mende bar, "I have it"
ablativepianinodanfrom the upright pianopianinoladanfrom the upright pianoswhere 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
mypianinommy upright pianopianinolarımmy upright pianos
yourpianinongyour upright pianopianinolarıngyour upright pianos
his / herpianinosuhis / her upright pianopianinolarıhis / her upright pianos
ourpianinobuzour upright pianopianinolarıbızour upright pianos
you all'spianinoğuzyou all's upright pianopianinolarığızyou all's upright pianos
theirpianinolarıtheir upright pianopianinolarıtheir upright pianos

The overlap in the last rows is real, not a mistake: pianinoları can mean "his / her upright pianos", "their upright piano", or "their upright pianos" — context decides.