Which word is what? I thought that Beth meant what. Is this from the North?
Here, "what" means "which", standing as it does before a noun.
That's not quite the same as "what" which stands by itself.
Welsh has different words: beth is "what" (standing on its own) and pa X is "which X, what X" (before a noun asking to identify a particular such noun from a group of possible similar nouns, e.g. which colour out of those that exist or which book out of those on the table).
Hmm I personally wouldn't use "Sy" here but I can't think what rules there is to it.
https://www.duolingo.com/comment/13404102 is probably a sentence you are thinking of?
I have the impression that sy is a relative "...which is", so there you have "what colour hair is it that is with you" whereas here it is simply "what colour is the little tortoise" rather than something like "what colour is it that the little tortoise has?" so it takes the normal "is" verb.
Yeah, that's the sentence i was thinking of. I guess i'll just have to see it more in context before it really makes sense.