ydw. i am drowning :(
Why do ti and yn not contract as in other sentences (i.e. Wyt ti'n)?
You don't contract yn when it means "in".
Wyt ti'n canu? (Are you singing?)
Wyt ti yn y bath? (Are you in the bath?)
... môr mean both sea and ocean?
Yes, "cefnfor" means "ocean" but "môr" can mean "sea" or "ocean", especially if you're using American English or in phrases like this (Y Môr Tawel).
"if you're using American English"
After all, America has no seas, only oceans.
Maybe that's why US English uses the word "ocean" more than we do in UK English then.
... that was my point :)
Our Lakes are pretty Great, though.
In the US, this would be asking if a person is in the ocean. Does it mean something different outside the US?