Ever since the character was introduced I struggled to understand how Chewbacca communicates with everyone. His grunts sound more or less the same every time but somehow everyone seems to "know" what he is trying say?
As per this wikipedia article,
Wookiees are capable of understanding Galactic Basic, but generally none are able to speak it because of the structure of Wookiee vocal cords
His human partner, Han Solo, also shows knowledge of Shyriiwook, or can at least understand Chewbacca
If Chewbacca is a wookie and can't speak Shyriiwook, how is Han able to understand him?