grib

/ɡrib/

Cases

SingularPluralWhen to use it
nominativegribthe mushroomgriblethe mushroomsthe plain dictionary form — the doer of the sentence
genitivegribnithe mushroom'sgriblenithe mushrooms'the owner — whose it is
accusativegribnithe mushroom (as the object)griblenithe mushrooms (as the object)a specific, known object — whom or what
dativegribgeto the mushroomgriblegeto the mushroomsdirection or recipient — to where, to whom
locativegribdeat / in the mushroomgribledeat / in the mushroomswhere it is; also having — mende bar, "I have it"
ablativegribdenfrom the mushroomgribledenfrom the mushroomswhere 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
mygribimmy mushroomgriblerimmy mushrooms
yourgribingyour mushroomgribleringyour mushrooms
his / hergribihis / her mushroomgriblerihis / her mushrooms
ourgribibizour mushroomgribleribizour mushrooms
you all'sgribigizyou all's mushroomgriblerigizyou all's mushrooms
theirgribleritheir mushroomgribleritheir mushrooms

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