şeker

/ ʃeker /

Cases

SingularPluralWhen to use it
nominative şeker the sugar şekerle the sugar the plain dictionary form — the doer of the sentence
genitive şekerni the sugar's şekerleni the sugar's the owner — whose it is
accusative şekerni the sugar (as the object) şekerleni the sugar (as the object) a specific, known object — whom or what
dative şekerge to the sugar şekerlege to the sugar direction or recipient — to where, to whom
locative şekerde at / in the sugar şekerlede at / in the sugar where it is; also having — mende bar, "I have it"
ablative şekerden from the sugar şekerleden from the sugar 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 şekerim my sugar şekerlerim my sugar
your şekering your sugar şekerlering your sugar
his / her şekeri his / her sugar şekerleri his / her sugar
our şekeribiz our sugar şekerleribiz our sugar
you all's şekerigiz you all's sugar şekerlerigiz you all's sugar
their şekerleri their sugar şekerleri their sugar

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