Yes, we were able to determine the Egyptian symbols/words specifically used on the Rosetta Stone, as well as get the gist of the grammatical structure.
But how did/do we determine the meaning of all the other symbols/words/grammar not used on the Stone?
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The Rosetta stone didn’t teach us *everything* about Egyptian, but rather gave us a starting point. Like the language was completely, truly lost and nobody alive could speak any of it. The Rosetta stone gave us enough text with still readable translations that we could understand small bits of Egyptian, and slowly learn more and more through context. Sort of like how high school doesn’t teach you a whole language, but the required classes can make the rest easier.
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