I want to give my 5 kopecs. When in English there is 'of' in Russian there will be G. case. in English: by, with - in Russian Instrumental case (Tvoritelnyj padezh)

Genetive case (Родительный падеж): Nouns in this case answer at question "Кого? Чего?" and u can use as helpful word "нет": нет (чего?) дождя; нет (кого?) бабушки. if word in russian ends for "a" - in genetive case, usually, we changa "a" for "и" or "ы" (лунА - лунЫ, собака - собакИ) if "н/м/к/б" and other consonats - add "a" to the end (волк - волкА, дом - домА, шкаф - шкафА, стол - стола) if "o" - change for "a" (окнО - окнА, кресло - креслА) if "ь" - too many variants, depends on genus, letter before "ь" and other... Hope this short rules will help u)) P.S. all this is right only for singular, for plural other rules. U can write me a personal message and we will discuss this more deeper.

In addition to all the useful theory - here's a link to a popular Russian song that you might like, which has a lot of genitive forms - http://www.belovedenemies.com/products/product-1

Hallow!I am Irishka from Ukraine!I speak Russian ,Ukrainian, English ,Arabic languages (my skype- soosoozoozoo2)Welcome your English,my Russian!

: ) I'm not a linguist. But if you need Genitive Case for communication replace with construction well known and save your time for other things. Simplify "Это Анна. А это её книга. This is Ann. And this is her book" against "Это книга Анны - This is Ann's book" "Чай отсутствует - Tea is missing." вместо "Чая нет - There is no tea" " Молоко. Один стакан, пожалуйста. - Milk. One glass, please." and after when you hear "Стакан молока? - A glass of milk?" or other G.C. forms often enough you remember them and understand.