Use of 'y' between words

I’m enjoying going back to basics with AutoMagic but it seems like S. Welsh eg moyn instead of isio and nawr instead of rhwan. Is there a North version?[quote=“Hendrik, post:4, topic:39456, full:true”]

In these instances it should be an i, not y:
Mae gyda fi rhywbeth i ddweud.

This usage of prepositions is a point of confusion that pops up from time to time, so instead of trying to reinvent the wheel, I’m linking to an older thread containg excellent explanations:

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