That's some Serbic language, right? It would be easier to answer if you gave the expression in English, because a lot more Germans understand English than Serbic languages. :-) With a little help of Google Translate: Do you have beer (asking in a restaurant) = Haben Sie (auch) Bier? (Usually every restaurant will have beer) Ja sam Srbin = Ich bin ein Serbe (if you are male). Ne lazi me = Lügen Sie mich nicht an. (polite address) I'm not sure about the rest.

Why are you writing the expressions you want to know in Serbian and not in English if English is your mother tongue??