Dear Sir, can you explain : What are the differencies between old greek (bizantine) language and new grek language?
The Greek language and culture is a complicated case,
we see start of Mycenean (proto-Greek) culture from Vatin mainly and Vucocar after (Serbia Croatia) after the IE 'invasion'
while Cotofeni which near yamnaa might be of Thracians,
Start point of more clear Greek/Mycanean culture is lake Lychnitis (Ohrid) and south,
Linguistic comes from Greco-Aryan LPIE (Greek-Medes) which is the first centum-satem split known.
Greek follows also the evolution of P and Q celtic (Ikkos/ippos)
Ancient Greek was isotones with Thracian, at least the Brygian/Phrygian branch,
the proto Greek languages we know are Mycenean and Homeric,
Greek aspirations might come from the mix of IE that came from Vatin or Minor Asia with previous Pelasgians, or with Anatolian IE brances (the case of Arzawa/assuwa is something that discussed)
Greek was divided to amny dialects, but 3 major
the Mycenean
the Hellenic Dorian and last Makedonian
the Pelasgian Ionian Aeolian
from Homer and Mycaenae we have a pause due to Sea paoples, (could be another wave of pelasgians)
then we see the restart in a language called Archaic by Hesiodos
and evolution of dialects to more common forms,
at 4rth century Attic (part of Ionian) is the most common
but the expand of Makedonians enter and change that common to Koine (common language, above all dialects)
Koine is a mix but mostly Attic, Ionian and Makedonian,
Koine is the language of times called Hellenistic,
then come the Romans but language is still koine although evolutes according the area of writer, (Alexandrine, Pergamos etc) influence of latin etc etc
Koine 2 is the later language an evolution of koine to the East Roman Empire status,
After Flavian Dynasty start new dynasties, and we see decrease of Latin and increase of Greek of that time,
Roman influenced a lot, and we see new elements, after 8-9th century we see also some Slavic elements,
After 1204 and the first fall of Con/polis to latin rulers, we see new centers of Greek language, which input their own sounds, elements, vocabulary, these are called modern Greek idioms,
except the Pontic Greek of Trapezous which stayed and kept forms in speech that are so ancient which even modern scientists wonder how and what,
after the 1821 independence scholars provide an artificial language to unite all these idioms and turn language back to Attic and Koine 1.
it lasted a century and more, but cdollapse due its difficulties, yet Attic and koine was more easy understable than the artifcial ones,
so from 1925 they used δημωδη and idioms,
modern Greek is based upon the Thracian idiom, (Greek from area North of Con/polis to Black sea) the most simple of all,
reject the dative case etc etc
yet this is not a solution cause creates linguistic problems, but is something.