(As in I don’t etc)
My Welsh speaking workmate (Swansea) uses Nagyw.
Nagyw i’n gywbod - I don’t know.
Os ngyw ti’n neud goffee - If you don’t make a coffee.
Nagyw ni’n weld y plant - We don’t see the kids.
Etc, etc.
Oh, sorry John! It seems that no one came back to you with this question. 
Are you still struggling with this variant? I’m not going to attempt to clarify myself as I’m northern dialect. But let us know if you need any further help. 
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Hi Catrin.
Wow, observant. Thanks so much - I think there were some other questions at the same time so I was happy to wait. Anthony helped me out on the SSiW FB page.
So glad you got it sorted!
Shwmae,
It is a common variant of the negative in the present tense used mainly in the Swansea Valley area (Cwm Tawe) :
Nagw i - dw i ddim
Nag wyt ti - dwyt ti ddim
Nag yw e/hi - dyw e/hi ddim
Nag yn ni - dyn ni ddim
Nag ych chi - dych chi ddim
Nag yn nhw - dyn nhw ddim (‘h’ dropped in speach)
Dai
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Thanks so much, Catrin & Dai. You’ve encouraged me to use this more. Also you are reminding me that I have been speaking Welsh most days now, for 4 months. 
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