Hi reema, have a look at these 3 websites
The Russian Noun Case System
Remember: in Russian all prepositions are associated with a case which is attached to their objects. Since only nouns can express case, this means that only ...
www.alphadictionary.com/rusgrammar/case.html - Cached - Similar
Cases of Russian Nouns - Russian Language
This lesson will introduce you into six cases of a noun.
masterrussian.com/aa071600a.shtml - Cached - Similar
Russian Nouns - Basic to Advanced Lessons
Lessons on nouns in Russian language. Learn about declension of Russian nouns, cases, gender, number, suffixes and more.