"Did you have supper last night?"
Translation:Gaethoch chi swper neithiwr?
Just to check - S.W. gest ti swper neithiwr N.W. Wnest ti gael swper neithiwr I wrote the N.W. variant and gave me an error - it's ok I just want to check whether I got it in both dialects... ^__^
Both of your suggestions are correct as variants. The WJEC courses use the same form in both North and South Wales courses so we didn't have your suggested North Wales variant, that's been added now, thanks for the suggestion.