"Beth dych chi'n gallu wneud yn eitha da?"

Translation: What are you able to do quite well?

[DIngvarsson]

The second 'yn', is that a kind of adverb indicator?

[rmcode]

Yes, it links the verb to the adverb.

[deactivated user]

Surely you wouldn't actually say this? It's so insulting. You would likely find out that what I do "Quite well" is a right uppercut.

[MrGWallCymraeg]

The Cymraeg Duolingo course would never encourage violence! Maybe your answer could be, "A Martini, but I'd like to do it better" - something like this :P But in all seriousness, practising the sentence pattern is better than 100% rainbow and giggles sentences :P

[deactivated user]

I do so agree that practising the sentence pattern is important. I wasn't being serious, but REALLY........ :D

[MrGWallCymraeg]

Hahahahaha