The Nominative Case
To mark the subject and to name a thing
The Genitive Case
To show whose anything is and to show whom something pertains.
The Dative Case
To attribute something to someone and to mark the indirect object.
The Accusative Case
To mark the direct object.
The Vocative Case
To call on persons or things.
The Ablative Case
To show something to be taken from another and to use with prepositions.