selpi

/selpi/

Cases

SingularPluralWhen to use it
nominativeselpithe first swarmselpilethe first swarmsthe plain dictionary form — the doer of the sentence
genitiveselpinithe first swarm'sselpilenithe first swarms'the owner — whose it is
accusativeselpinithe first swarm (as the object)selpilenithe first swarms (as the object)a specific, known object — whom or what
dativeselpigeto the first swarmselpilegeto the first swarmsdirection or recipient — to where, to whom
locativeselpideat / in the first swarmselpiledeat / in the first swarmswhere it is; also having — mende bar, "I have it"
ablativeselpidenfrom the first swarmselpiledenfrom the first swarmswhere 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
myselpimmy first swarmselpilerimmy first swarms
yourselpingyour first swarmselpileringyour first swarms
his / herselpisihis / her first swarmselpilerihis / her first swarms
ourselpibizour first swarmselpileribizour first swarms
you all'sselpigizyou all's first swarmselpilerigizyou all's first swarms
theirselpileritheir first swarmselpileritheir first swarms

The overlap in the last rows is real, not a mistake: selpileri can mean "his / her first swarms", "their first swarm", or "their first swarms" — context decides.