naja = well or like:"im not satisfied but ok" ...... Are you still hungry ??? naja, nicht wirklich - well not really. also = so: Also ging ich nach Hause - so i went home..... so = so: es its so cool - its so cool OR so = like/around: So in 5 minuten habe ich Zeit - i got time in "like" 5 minutes. tja is a bit more complicated.^^ Tja, so ist es halt - well it is how it is tja, selber schuld - well your own fault tja, pech gehabt. - well bad luck I hate people which always use that word. It sounds that they dont care about anything and that they dont give a thing about anything.... Hope i could help you =)

There are no rules in using this kind of words (in German they are called 'Füllwörter'). Generally said should you avoid them :) Regarding 'tja': http://de.wiktionary.org/wiki/tja Es heißt übrigens korrekt 'na ja' ;)

As far as I understood it should be like that: "naja" is a kind of non secure "yes" or an annoyed "yes" "also" is like the english "well" at the beginning of a phrase "so" is like the german "also" at the beginning of a phrase or is a kind of exhortation when it follows a phrase and it has a question mark.

,Im not german, but try to guess. So and also should be and is same as english. Exept pronounciation. Na ja = like well yes, yes sure.