Those "bejah, bejaše, bejaše...." are the imperfect tense forms of verb BITI (to be).
http://en.wikipedia.org/wiki/Imperfect
and here are the suffixes for the imperfect tense
http://sr.wikipedia.org/wiki/%D0%98%...BA%D0%B0%D1%82
On the right side of that page you can find suffixes for other tenses, i think it's very useful. The bad thing is that the explanations are in Serbian... but i could try to translate it if you want.
hehe, i didn't even see your reply, Dangerous&Moving.
Ne bih da mislis da nesto zameram tvom odgovoru..