grob

/ɡrob/

Cases

SingularPluralWhen to use it
nominativegrobthe coffingroblathe coffinsthe plain dictionary form — the doer of the sentence
genitivegrobnuthe coffin'sgroblanıthe coffins'the owner — whose it is
accusativegrobnuthe coffin (as the object)groblanıthe coffins (as the object)a specific, known object — whom or what
dativegrobhato the coffingroblağato the coffinsdirection or recipient — to where, to whom
locativegrobdaat / in the coffingrobladaat / in the coffinswhere it is; also having — mende bar, "I have it"
ablativegrobdanfrom the coffingrobladanfrom the coffinswhere 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
mygrobummy coffingroblarımmy coffins
yourgrobungyour coffingroblarıngyour coffins
his / hergrobuhis / her coffingroblarıhis / her coffins
ourgrobubuzour coffingroblarıbızour coffins
you all'sgrobuğuzyou all's coffingroblarığızyou all's coffins
theirgroblarıtheir coffingroblarıtheir coffins

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