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There are two cases. The Common one and The Genitive
There are no cases at all, the form `s is optional because the same relations may be expressed by the ‘of-phrase’: the doctor’s arrival – the arrival of the doctor
There are three cases: the Nominative, the Genitive, the Objective due to the existence of objective pronouns me, him, whom
Case Grammar. Ch.Fillmore introduced syntactic-semantic classification of cases. They show relations in the so-called deep structure of the sentence. According to him, verbs may stand to different relations to nouns.