sır

/sɯr/

Cases

SingularPluralWhen to use it
nominativesırthe secretsırlathe secretsthe plain dictionary form — the doer of the sentence
genitivesırnıthe secret'ssırlanıthe secrets'the owner — whose it is
accusativesırnıthe secret (as the object)sırlanıthe secrets (as the object)a specific, known object — whom or what
dativesırğato the secretsırlağato the secretsdirection or recipient — to where, to whom
locativesırdaat / in the secretsırladaat / in the secretswhere it is; also having — mende bar, "I have it"
ablativesırdanfrom the secretsırladanfrom the secretswhere 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
mysırımmy secretsırlarımmy secrets
yoursırıngyour secretsırlarıngyour secrets
his / hersırıhis / her secretsırlarıhis / her secrets
oursırıbızour secretsırlarıbızour secrets
you all'ssırığızyou all's secretsırlarığızyou all's secrets
theirsırlarıtheir secretsırlarıtheir secrets

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