"Koji ti je andrak?" (what's the matter with you? what is wrong with you?) ... a blast from the past ! I was so happy when I came across this phrase which I haven't heard for ages :o) Where do words hide when they grow old?
According to the case suffixes, nouns in Serbian can be grouped into three or four declensions (the order and number hasn't been established yet). I'll list the three most commonly presented ones, starting from the most complex one, which is often subdivided, depending on the noun gender and its stem ending:
Masculine nouns ending in a consonant Neuter nouns ending in -o or -e
*Note that Masc. nouns in Sg. Acc. is the same as the Genetive if the noun denotes an 'animate concept', like human being or an animal, while the 'inanimate' ones are objects, but also plants and groups of people or animals (like 'a people'= 'narod' or pack (of wolves)= 'čopor')
** All Neuter nouns have the same form for Nominative, Accusative and Vocative, which is really great :o)
*** With Masc. nouns ending in palatal 'j, lj, nj, č, dž, đ, ć, š, ž' a/ in Sg. Instrumental case it will end in 'em', instead of 'om' b/ in Sg. Vocati…