I'm just starting to work my way through Course 3 Northern (sequence has been Level 1; Course 1 skipping every two or 3 lessons, just to fill in different coverage, plus some of the vocab; Level 2; Level 3 1-6).
Because it's the old Course & I've done the Levels, there are some words and constructions that are new on me. In Lesson 3 I've just come across this: I'll say what's been prepared -- Ddida i beth sydd wedi ei baratoi (I think).
Is that right? -- I misheard the "ei baratoi" as some thing like "y" or "yn" baratoi, and was totally puzzled, but now I've listened again to type it here, I think I've got it...
ETA: However, that pronoun reminds me that I really don't get "i'w" versus "i": I've heard things like "Rhywbeth i'w fwyta" plenty of times in the course, but never "i'w yfed" as far as I can tell. However, it might just be the example sentences -- I think that yfed normally comes up as "gormod i yfed", and so I don't know whether it's more that 'gormod' behaves differently to 'rhywbeth', or that 'bwyta' works differently to 'yfed', or that I just haven't listened well enough.