Answer (10). Both Shem and Noah spoke the language of Adam and Eve. We have no evidence that this language was anything other than Hebrew, the language of the oldest Biblical manuscripts. (Shem was the great-grandfather of Eber, from whom we get the name “Hebrew.” He naturally would speak the same language as his great-grandson. Eber was the great-great-great-great-grandfather of Abraham.) Certainly neither of these righteous men had anything to do with building a pagan Tower of Babel. Not having been there and involved in this rebellion, their Hebrew language would not have been affected by the confounding of languages at Babel. We can trace the lineage of the patriarchs and see how their Hebrew language continued from the beginning.
Abraham lived to see his grandchild Jacob (Israel). Abraham was alive in the days of Shem, who was born before the flood. Obviously Abraham would have spoken the same language that his family line used before and after the flood: pure Hebrew.