tefter

/tefter/

Cases

SingularPluralWhen to use it
nominativetefterthe notebooktefterlethe notebooksthe plain dictionary form — the doer of the sentence
genitivetefternithe notebook'stefterlenithe notebooks'the owner — whose it is
accusativetefternithe notebook (as the object)tefterlenithe notebooks (as the object)a specific, known object — whom or what
dativeteftergeto the notebooktefterlegeto the notebooksdirection or recipient — to where, to whom
locativetefterdeat / in the notebooktefterledeat / in the notebookswhere it is; also having — mende bar, "I have it"
ablativetefterdenfrom the notebooktefterledenfrom the notebookswhere 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
mytefterimmy notebooktefterlerimmy notebooks
yourtefteringyour notebooktefterleringyour notebooks
his / hertefterihis / her notebooktefterlerihis / her notebooks
ourtefteribizour notebooktefterleribizour notebooks
you all'stefterigizyou all's notebooktefterlerigizyou all's notebooks
theirtefterleritheir notebooktefterleritheir notebooks

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