"Please"

Translation: Os gwelwch chi'n dda

[NeilDwi]

Is 'plis' used commonly throughout Wales because it is shorter and quicker to say, or is it avoided because of wanting to use the full welsh ways of saying please?

[ibisc]

It is largely a matter of personal preference. Plîs is very common in informal registers of Welsh.

[LeeRoka]

Bit confused about when to use:
- os gwelwch chi'n dda
- os gwelwch yn dda
- os gweli di'n dda

I think from below - os gwelwch chi'n dda = 2nd pers form/pl; os gweli di'n dda = 2nd pers inform sing, but not sure what - os gwelwch yn dda - is meant to represent. Help and clarification very much appreciated...!

[ibisc]

os gwelwch chi'n dda and os gwelwch yn dda are exactly equivalent.