The Genitive

The genitive case of a noun is used in the following circumstances:-
(1) When the nouns are combined in a possesive context...
Examples
Bus na sgoile - The School bus
Cas a' bhùird - The leg of the table
(2) When a noun is preceeded by certain compound prepositions of which the most common are as follows:-
a' chum - for the purpose of
air muin - on top of
air beulaibh - in front of
a dh' ionnsaigh - towards
an aghaidh - against
airson - for (on account of)
air cùlaibh - behind
am measg - amongst
Còmhla ri(s) - along with
cuidhe ri(s) - along with
an àite - in place of
mu choinneamh - opposite
mun cuairt - around
os cionn - above
an dèidh - after
an làthair - in the presence of
mu thimicheall - about regarding
mu dheidhinn - about concerning
Examples
mu thimicheall an taighe - regarding the house
air beulaibh an rathaid -- in front of the road
an dèidh na dìnneir - after the dinner
am measg nan Gaidheal - amongst the Gaels
(3) When a noun is preceeded by certain prepositions which are:-
thar - across over
rè - during
chun - towards
trid - on account of
Examples
thar na mara - across the sea
rè na h-oidhche - during the night
chun a' bhùird - to the table
trid na h-eaglaise - on account of the church