fontan

/fontan/

Cases

SingularPluralWhen to use it
nominativefontanthe fountainfontanlathe fountainsthe plain dictionary form — the doer of the sentence
genitivefontannıthe fountain'sfontanlanıthe fountains'the owner — whose it is
accusativefontannıthe fountain (as the object)fontanlanıthe fountains (as the object)a specific, known object — whom or what
dativefontangato the fountainfontanlağato the fountainsdirection or recipient — to where, to whom
locativefontandaat / in the fountainfontanladaat / in the fountainswhere it is; also having — mende bar, "I have it"
ablativefontandanfrom the fountainfontanladanfrom the fountainswhere 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
myfontanımmy fountainfontanlarımmy fountains
yourfontanıngyour fountainfontanlarıngyour fountains
his / herfontanıhis / her fountainfontanlarıhis / her fountains
ourfontanıbızour fountainfontanlarıbızour fountains
you all'sfontanığızyou all's fountainfontanlarığızyou all's fountains
theirfontanlarıtheir fountainfontanlarıtheir fountains

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