tanış

/ tanɯʃ /

Cases

SingularPluralWhen to use it
nominative tanış the acquaintance tanışla the acquaintances the plain dictionary form — the doer of the sentence
genitive tanışnı the acquaintance's tanışlanı the acquaintances' the owner — whose it is
accusative tanışnı the acquaintance (as the object) tanışlanı the acquaintances (as the object) a specific, known object — whom or what
dative tanışha to the acquaintance tanışlağa to the acquaintances direction or recipient — to where, to whom
locative tanışda at / in the acquaintance tanışlada at / in the acquaintances where it is; also having — mende bar, "I have it"
ablative tanışdan from the acquaintance tanışladan from the acquaintances 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 tanışım my acquaintance tanışlarım my acquaintances
your tanışıŋ your acquaintance tanışlarıŋ your acquaintances
his / her tanışı his / her acquaintance tanışları his / her acquaintances
our tanışıbız our acquaintance tanışlarıbız our acquaintances
you all's tanışığız you all's acquaintance tanışlarığız you all's acquaintances
their tanışları their acquaintance tanışları their acquaintances

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