By rules of modern Russian the nouns have six cases: imenitelny, genitive, accusative, dative, instrumental and prepositional. Change on them, or inducement, is defined by a context.
Instruction
1. Before definition ask a question to a noun. The noun in the Nominative case answers questions: "Who? What?".
2. Questions of an accusative case – "Whom? What?". The nouns answering this question if before them there is no pretext, are a direct object. In other cases and in other cases (except some cases genitive) objects are indirect.
3. The noun in a genitive case answers a question "Whom? What?". If before a noun there is no pretext, and before a predicate there is a denial (an example: "I do not wear socks"), the noun is direct.
4. Question of a dative case "to the Lump? To what?".
5. Nouns in an instrumental case answer a question "with Whom? Than?".
6. The prepositional case differs in the fact that before it the pretext is always put. His questions: "About whom? About what?".