(no offense) Suddenly I have this question in my mind, what language did they say to each other in the Garden of Eden? That said Hebrew? Latin? or just Blah Blah blah? What would you think?
Assuming you believe that Adam and Eve even existed at one point (I personally do), it's hard to know. If I had to guess I'd say maybe Hebrew- but that's totally blind guess. There's instances in the Bible where other languages created and cultures split though.
Maybe they didn't need to speak to each other, maybe they just knew what they needed to communicate to each other just by looking at each other.