karandaş

/karandaʃ/

Cases

SingularPluralWhen to use it
nominativekarandaşthe pencilkarandaşlathe pencilsthe plain dictionary form — the doer of the sentence
genitivekarandaşnıthe pencil'skarandaşlanıthe pencils'the owner — whose it is
accusativekarandaşnıthe pencil (as the object)karandaşlanıthe pencils (as the object)a specific, known object — whom or what
dativekarandaşhato the pencilkarandaşlağato the pencilsdirection or recipient — to where, to whom
locativekarandaşdaat / in the pencilkarandaşladaat / in the pencilswhere it is; also having — mende bar, "I have it"
ablativekarandaşdanfrom the pencilkarandaşladanfrom the pencilswhere 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
mykarandaşımmy pencilkarandaşlarımmy pencils
yourkarandaşıngyour pencilkarandaşlarıngyour pencils
his / herkarandaşıhis / her pencilkarandaşlarıhis / her pencils
ourkarandaşıbızour pencilkarandaşlarıbızour pencils
you all'skarandaşığızyou all's pencilkarandaşlarığızyou all's pencils
theirkarandaşlarıtheir pencilkarandaşlarıtheir pencils

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