Why is "Rydw i eisiau" oren not accepted here?
Maybe "Rydw" is too formal for this situation?
When I should use "dw" or "rydw"?
Both are equivalent. I think duolingo use "dw" because this is spoken welsh. "Rydw" is correct though, and duolingo is gradually accepting rydw as an acceptable answer :)
Does the verb always come before the subject like in Irish, or is this something special with the verb 'bon'?