|Prepositions Governing the Nominative Case|
Only two Russian prepositions are used with the Nominative case and those are used semi-idiomatically.
1. The preposition за+Nom is used only in questions with the interrogative pronoun что, where it is a synonym of the adjectival pronoun какой in the sense of 'what kind of', as the following examples illustrate.
|Что она за женщина?|
What kind of woman is she?
|Какая она женщина?|
|Что Володя за студент?|
What kind of student is Volodya?
|Какой студент Володя?|
2. The other preposition which governs the nominative case is в+Nom, used exclusively with plural objects to indicate joining an organization of some type, as illustrated in the following examples.
|Маша недавно вышла в рабочие.||Masha recently became worker.|
|Дима пошёл в политики.||Dima has become a politician.|
Otherwise, the nominative case is used only to mark the subject of the clause or sentence. (Of course, it also is used to mark the citation form of a noun or adjective listed in the dictionary or used as a label on an object in the real world.)