not to add 'clutter,' but my question is about the answer i submitted. i wrote 'mae fy nhad yn byw yn abertawe.' my question is twofold: in this instance and others like it, wouldn't both 'fy nhad i'n' and 'fy nhad yn' work? also, how can one phonetically distinguish between 'yn' and 'i'n'? cheers.
Both patterns are correct - fy nhad and fy nhad i are equivalent in meaning, with the second often used to emphasise the 'my'.
The pronunciation of yn and i is quite different, and the course voice shows this. yn is close to the '-un' in southern British English 'bun', while i is the '-i-' in 'bin'.