The origional language has not changed. In fact the Hebrew section of the Bible only uses 5000 words. The Greek is a lot more exacting of a language. It was a military language used to conquer the world. For example in the Greek there are over 32 words that are translated into the English word: "GO". go up, go down, go around, go though, go over, go under and so on.
We know that the Hebrew Bible has not changed because they found the dead sea scrolls from over 2500 years ago, so they can verify that it has not changed. The Hebrew scribes were very exacting not to make errors or changes in the sacred scriptures.