bet

/bet/

Cases

SingularPluralWhen to use it
nominativebetthe facebetlethe facesthe plain dictionary form — the doer of the sentence
genitivebetnithe face'sbetlenithe faces'the owner — whose it is
accusativebetnithe face (as the object)betlenithe faces (as the object)a specific, known object — whom or what
dativebetgeto the facebetlegeto the facesdirection or recipient — to where, to whom
locativebetdeat / in the facebetledeat / in the faceswhere it is; also having — mende bar, "I have it"
ablativebetdenfrom the facebetledenfrom the faceswhere 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
mybetimmy facebetlerimmy faces
yourbetingyour facebetleringyour faces
his / herbetihis / her facebetlerihis / her faces
ourbetibizour facebetleribizour faces
you all'sbetigizyou all's facebetlerigizyou all's faces
theirbetleritheir facebetleritheir faces

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