parus

/parus/

Cases

SingularPluralWhen to use it
nominativeparusthe sailparuslathe sailsthe plain dictionary form — the doer of the sentence
genitiveparusnuthe sail'sparuslanıthe sails'the owner — whose it is
accusativeparusnuthe sail (as the object)paruslanıthe sails (as the object)a specific, known object — whom or what
dativeparushato the sailparuslağato the sailsdirection or recipient — to where, to whom
locativeparusdaat / in the sailparusladaat / in the sailswhere it is; also having — mende bar, "I have it"
ablativeparusdanfrom the sailparusladanfrom the sailswhere 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
myparusummy sailparuslarımmy sails
yourparusungyour sailparuslarıngyour sails
his / herparusuhis / her sailparuslarıhis / her sails
ourparusubuzour sailparuslarıbızour sails
you all'sparusuğuzyou all's sailparuslarığızyou all's sails
theirparuslarıtheir sailparuslarıtheir sails

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