Yes, I've noticed Han understand what the wookies say, but the thing is, how come he can identify sentences from it?? I mean, how can you comunicate a complex sentence by just grunting like that? It's not like huttese, a language that actually sounds like it means something, with words and everything... OK maybe the wookies can comunicate by extreme complex combinations of fast sounds, but there's NO way a human could understand it!