Time for me to ask a quick one:
Example: "Sut dwi fod i gogio bo' ni erioed wedi cyfarfod o'r blaen?"*
This is not something I ever recall learning in formal lessons all those years ago, so it's a grammatical construct that I've picked up by osmosis and only really understand from context. To me, although it doesn't translate literally, it runs something along the lines of "I ought to be" or "I'm supposed to be".
Anyone know how this is formally translated? Is it an 'official' part of the language, or is it colloquial?
*Bonus points for identifying where that is from.