Here I am again. Going through Level 2, Challenges 13-15, have come across different ways to say “You Said”. I have heard it said…Dwedest Ti, Dwecoch Chi, and I Ti Ddweudd…. Are they interchangeable… Asking for a friend… All the Best
No - tell your friend 
that they’re not interchangeable. Although they can all mean “you said”, there are differences.
dwedest ti - you said - to a single person or ‘familiar form’
dwedoch chi - you said - to more than one person or ‘polite form’
i ti ddweud - you said - when part of a complex sentence, e.g. O’n i’n meddwl i ti ddweud = I thought (that) you said
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