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Languages don't die out unless their speakers are all killed off (which happened to a number of tribes in both the Americas and Australia) or they choose or are forced to adopt another language (as happened to other tribes in the Americas and Australia, and a few in Europe, such as Cornish and Livonian).
We call Ancient Greek and Latin "dead" languages, but what happened historically is that they kept evolving and evolving, incorporating new words and shedding old ones, simplifying their grammar or adding new complications, gradually moving away from the old standard, until the time came when ordinary people could no longer understand them.
Greek was widely spoken for inter-ethnic communication all over the Eastern Mediterranean (which is why the New Testament was written in it). Most educated Romans also spoke it. However, the territories that were inhabited by native speakers of Greek were relatively small, consisting mostly of Greece, eastern Turkey, and Cyprus, and as the language lost its influence, especially as Islam spread in much of its former range, native speakers were soon the only speakers.
Latin also evolved. In the home territory of Rome itself, it evolved into the many dialects of Italy. In effect, then, Latin didn't really die. The descendants of the ancient Romans just kept speaking a little bit differently every generation, but until the 13th century, they kept writing in Latin. It was in the 13th century that Dante Aligheri wrote his Divine Comedy and became the first Italian author to write a major literary work in the language that people of his time actually spoke.
Similar evolution occurred in the old Roman territories. The people there were mostly not native speakers, but non-Roman ethnic groups who had assimilated to Roman culture. For example, the "mooshed together" sound system of French is attributed to the fact that most of the people who adopted Latin there were Celtic or Germanic. Spanish and Portuguese were influenced by Arabic, and Romanian by the Slavic languages. But they were all continuous descendants of Latin, with one generation following on another and no break, just gradual changes that kept accruing, until one day, people noticed that they had to learn Latin out of a book.
Hebrew had already evolved into Aramaic by the time of Jesus, and there are still small communities of Aramaic speakers in the Middle East. In that sense, Hebrew was a dead language for everyday use 2,000 years ago. Even so, Jews throughout the world studied Hebrew as a second language for religious purposes during the entire period before the beginnings of the Zionist movement.
In the case of modern Greek, my understanding is that it's written much the same as ancient Greek, especially in the more conservative Katharevousa form, but it's pronounced quite differently.
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