Greek accent

[Asterix]

I have a question about greek accent :

The accent of any word: Is it natural (being on a certain syllable like in Russian) or is it on a certain part of the word (like in a stem like in German) or is there any special rule (like in Latin or Spanish) ?

I understood the rules of accent putting and changes by declincion etc., but asked myself how to determine the accent finally in the nominativ for example.

Lógos: why is it Lógos and not Logós, for example ?

Thank you

P.S. Sorry for my bad english, but it's late and I'm tired.

[annis]

I understood the rules of accent putting and changes by declincion etc., but asked myself how to determine the accent finally in the nominativ for example.

Well, there are a few patterns, but most of the time you just have to memorize where the accent goes on nouns and adjectives. Verb accent is always predictable.

[Titus Marius Crispus]

Accents on nouns are called persistent. They try to stay on the same syllable throughout declension. You must simply memorize where the accent on a given noun is.

Verbs' accents, however, are recessive. They go as far back as possible in the word. (i.e. if the ultima is short, the antepenult is accented. If the ultima is long, the penult is accented.)