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Cases

SingularPluralWhen to use it
nominative top the ball topla the balls the plain dictionary form — the doer of the sentence
genitive topnu the ball's toplanı the balls' the owner — whose it is
accusative topnu the ball (as the object) toplanı the balls (as the object) a specific, known object — whom or what
dative topha to the ball toplağa to the balls direction or recipient — to where, to whom
locative topda at / in the ball toplada at / in the balls where it is; also having — mende bar, "I have it"
ablative topdan from the ball topladan from the balls 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
my tobum my ball toplarım my balls
your tobuŋ your ball toplarıŋ your balls
his / her tobu his / her ball topları his / her balls
our tobubuz our ball toplarıbız our balls
you all's tobuğuz you all's ball toplarığız you all's balls
their topları their ball topları their balls

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