sort

/sort/

Cases

SingularPluralWhen to use it
nominativesortthe gradesortlathe gradesthe plain dictionary form — the doer of the sentence
genitivesortnuthe grade'ssortlanıthe grades'the owner — whose it is
accusativesortnuthe grade (as the object)sortlanıthe grades (as the object)a specific, known object — whom or what
dativesorthato the gradesortlağato the gradesdirection or recipient — to where, to whom
locativesortdaat / in the gradesortladaat / in the gradeswhere it is; also having — mende bar, "I have it"
ablativesortdanfrom the gradesortladanfrom the gradeswhere 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
mysortummy gradesortlarımmy grades
yoursortungyour gradesortlarıngyour grades
his / hersortuhis / her gradesortlarıhis / her grades
oursortubuzour gradesortlarıbızour grades
you all'ssortuğuzyou all's gradesortlarığızyou all's grades
theirsortlarıtheir gradesortlarıtheir grades

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