See Nominative case. Many English grammarians prefer the term subjective case, but it is the same case. Generally, when the term subjective case is used, the accusative and dative are collectively labelled as the objective case. (This is possible in English because the two have merged; there are no surviving examples where the accusative and the dative are distinct in form, though their functions are still distinct.) The genetive is then usually called the possessive form and often is not considered as a noun case per se; English is then said to have two cases, the subjective and the objective. This view is an oversimplification, but it is didactically useful.
