In Russian, in the nominative case, you make a plural by using the letters "и", "ы", "я" or "а". For masculine nouns: If the word ends in a consonant, add “ы”. Replace “й” with “и” Replace “ь” with “и” студент (student) - студентЫ (students) конЬ (horse) - конИ (horses) For feminine nouns: Replace “я” with “и” Replace “ь” with “и” Replace “а” with “ы” (unless previous consonant is Г, К, Х, Ж, Ч, Ш, Щ then replace with "и" as per the spelling rules.) лошадЬ (horse) - лошадИ (horses) газетА (newspaper) - газетЫ (newspapers) For neuter nouns: Replace “о” with “а” Replace “е” with “я” (don't forget the spelling rules) зданиЕ (building) - зданиЯ (buildings)

Here it is: http://www.italki.com/groups/4151/topic/44728.htm

Well, it is just addition to... declination case? There is examples on the site: http://www.italki.com/groups/4151/topic/44586.htm http://www.italki.com/groups/4151/topic/44728.htm and more about it: http://www.italki.com/groups/4151/topic/44597.htm http://www.italki.com/groups/4151/topic/44595.htm