Why does: I am not feeling strong today use dw i ddim yn instead of Sai ?
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Hi @geoffreyallen,
They are equivalent or alternatives - so you could use either.
SSIW covers these sort of variations so that you are not thrown if someone says them to you…but of course you can use the one you feel the most comfortable with.
Rich 
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Sa/So is mainly used in the South, I think. I always use it in S Ceredigion
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For your info, it is a contraction of “Nid oes dim ohona i”
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For your info, it is a contraction of “Nid oes dim ohona i”
Yn wir. Jiw, jiw? 
I’d never have guessed that. 
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