Basque declensions

In basque grammar, there is about 20 declensions, among with 5 can be considered as fondamental cases :

		Singular	Plural		Examples
Nominative	NOR	-A	-AK	Used with untransitive verbs subjects.	Gizona etorri da (the man has come)
Active	NORK	-AK	-EK	Used with transitive verbs subjects.	Gizonak erran du (the man has told)
Dative	NORI	-ARI	-EI		Gizonak zaldiari belara eman du (the man has given some grass to the horse).
Possessive genitive	NOREN	-AREN	-EN	Whose, What	Gizonaren zaldia (man's horse)
Inessive (inert objects)	NON	-(e)AN	-ETAN		Gizonak etxean da (the man is in the house)

Following cases also exist :

		Singular	Plural		Examples
Inessive (living beings)	NORENGAN	-A(REN)GAN	-ENGAN
Elative (inert objects)	NON + TIK (NONDIK)	-(e)TIK	-ETATIK	From, since.	Gizona etxetik etorri da (The man has come from the house)
Elative (living beings)	NOREN + GANDIK	-A(REN)GANDIK	-ENGANDIK	From (who)	Ene maitearengandik gutun bat irakurtsen dut (I read a letter from my girlfriend)
	NON + KO (NONGO)	-(e)KO	-ETAKO	From	Baionetako exteak (Bayonne's houses)
Adlative (inert objects)	NO(N) + RA (NORA)	-(e)RA	-ETARA	to, towards	Etxetara joan da (He has gone towards the houses)
Unitive	NOREKIN	-AREKIN	-EKIN	With (who)	Bere amarekin etorri da (He has come with his mother)
	NORENGATIK	-A(REN)GATIK	-ENGATIK	Because
Prolative	NORENTZAT	-ARENTZAT	-ENTZAT	For (who)	Zaldi hori zure aitarentzat erosi dugu (We have bought this horse for your father)
Approximative	NO(N) + RAINO	-(e)RAINO	-ETARAINO	Up to, until
	NO(N) + RAKO	-(e)RAKO	-ETARAKO	to go where
	NO(N) + RANTZ	-(e)RANTZ	-ETARANTZ
Mediative (modality, transport, ...)	ZERTAZ ZEREZ	-AZ	-EZ		Treinaz etorri naiz (I came by train)
Partitive		-IK	-IK

Declensions elaboration must also take into account the following rules :

	Rule Nr 1 : When a word ends by a consonnant, an "e" has to be added (Ex : mutil + k = mutilek) When a word ends by a vowel, an "r" has to be added (Ex : seme + i = semeri)
	Rule Nr 2 : When two vowels succeeds, the following rules have to be applied : A + A = A (Ex : neskA + AREN = neskAren) A + E = E (Ex : neskA + EN = neskEn) E + A = EA (Ex : semE + AREN = semEAren) E + E = EE (Ex : semE + EN = semEEn)