tin

/ tin /

Cases

SingularPluralWhen to use it
nominative tin the spirit tinle the spirits the plain dictionary form — the doer of the sentence
genitive tinni the spirit's tinleni the spirits' the owner — whose it is
accusative tinni the spirit (as the object) tinleni the spirits (as the object) a specific, known object — whom or what
dative tinge to the spirit tinlege to the spirits direction or recipient — to where, to whom
locative tinde at / in the spirit tinlede at / in the spirits where it is; also having — mende bar, "I have it"
ablative tinden from the spirit tinleden from the spirits 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 tinim my spirit tinlerim my spirits
your tiniŋ your spirit tinleriŋ your spirits
his / her tini his / her spirit tinleri his / her spirits
our tinibiz our spirit tinleribiz our spirits
you all's tinigiz you all's spirit tinlerigiz you all's spirits
their tinleri their spirit tinleri their spirits

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