"No, I do not want chocolate."
Translation:Nac ydw, dw i ddim eisiau siocled.
What's the difference between using ddim yn moyn siocled .. or using ddim eisiau siocled? Is "yn moyn" primarily used in South Wales?
As explained in the 'hints and tips', moyn is used alongside eisiau, more particularly in some parts of south and west Wales, but it is understood all over Wales.
Remember that yn/'n is required with the verb-noun moyn, but not with the noun eisiau.
The correct version of the text displayed on the question page uses "dwi" instead of "dw i" (as above). Is that correct, and if so, why?
The usual version is dw i and that is what we would expect Duo to show in a prompt. Dwi is in the database as an accepted variation - in informal writing, some people often spell it as it is pronounced.
Did dwi come up in a multiple choice question, or as part of a single prompt?
Neither. It appeared in the "this is what you should have typed" message after I made an incorrect answer.