Turns out that during filming, Peter Mayhew (the man in the Wookiee suit) just interacts in English.
The Shyriiwook chat only gets added in post-production. Mind blown!
Check this clip of Chewie rowing with Hans Solo in The Empire Strikes Back -
https://twitter.com/TheWookieeRoars/stat...5454024706
"Where the Hell have you been?"