Thanks. I was wondering because I could see situations in English where, even though grammatically they aren't the same, you could say either one and the intended meaning is the same. I'm just starting Welsh and have no idea how far the grammatical lines bend. It already seems very different from other languages I've studied.

But if "How did you go" is acceptable as a translation of "Sut dach chi wedi mynd" which it is, how come "did you go to the park" isn't accepted here? There would be very few circumstances in which you would say "Have you gone to the park" in English whereas I suspect it is more natural and used in a wider context in Welsh