gid

/ɡid/

Cases

SingularPluralWhen to use it
nominativegidthe guidegidlethe guidesthe plain dictionary form — the doer of the sentence
genitivegidnithe guide'sgidlenithe guides'the owner — whose it is
accusativegidnithe guide (as the object)gidlenithe guides (as the object)a specific, known object — whom or what
dativegidgeto the guidegidlegeto the guidesdirection or recipient — to where, to whom
locativegiddeat / in the guidegidledeat / in the guideswhere it is; also having — mende bar, "I have it"
ablativegiddenfrom the guidegidledenfrom the guideswhere 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
mygidimmy guidegidlerimmy guides
yourgidingyour guidegidleringyour guides
his / hergidihis / her guidegidlerihis / her guides
ourgidibizour guidegidleribizour guides
you all'sgidigizyou all's guidegidlerigizyou all's guides
theirgidleritheir guidegidleritheir guides

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