erin

/ erin /

Cases

SingularPluralWhen to use it
nominative erin the lip erinle the lips the plain dictionary form — the doer of the sentence
genitive erinni the lip's erinleni the lips' the owner — whose it is
accusative erinni the lip (as the object) erinleni the lips (as the object) a specific, known object — whom or what
dative eringe to the lip erinlege to the lips direction or recipient — to where, to whom
locative erinde at / in the lip erinlede at / in the lips where it is; also having — mende bar, "I have it"
ablative erinden from the lip erinleden from the lips 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 erinim my lip erinlerim my lips
your erining your lip erinlering your lips
his / her erini his / her lip erinleri his / her lips
our erinibiz our lip erinleribiz our lips
you all's erinigiz you all's lip erinlerigiz you all's lips
their erinleri their lip erinleri their lips

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