"How are you Megan?"
Translation:Sut dych chi, Megan?
Would not "Sut dach chi Megan?" be correct? Is "dych" south and "dach" north walian?
dych chi is 'standard', dach chi is common across much of north Wales. Duo should accept both.
In other parts of Wales you would meet dech chi, r'ych chi, ŷch chi, och chi and probably some others as well! Duo doesn't do those...