"Where did he go on Tuesday?"
Translation:Lle aeth o ddydd Mawrth?
How come both of these are correct? I should have thought that dydd ought to either mutate or not mutate.
The d should correctly mutate to dd as it's on(ar) Tuesday but the ar(on) is not inserted before ddydd when pronounced. However, often people don't bother to mutate the d to dd- I understand that either way is acceptable.