The Russian Language has six cases. Each one of these cases performs its own function.
1. The Nominative Case: is the standard case. The words that you find in dictionaries and in word lists are all in the nominative case. This case answers the questions RNJ? Who and XNJ? What? In this case the masculine nouns will end in consonants and sometimes in the soft sign ( M ), the feminine nouns will end in ( F or Z) and sometimes in the soft sign ( M ) and the neuter nouns will end in ( J or T )
Important: After the Nominative Case, the endings of masculine, feminine and neuter nouns start changing.
2. The Genitive Case: answers the questions RJUJ? Of whom? And XTUJ? Of what? It serves to indicate the possession of something or the negation of something. You also use this case to tell age. The ending for masculine nouns will be ( F or Z ), for feminine ( S or B ) and for neuter ( F or Z ).