"Dych chi wedi mynd i'r parc?"

Translation: Have you gone to the park?

[josiruot]

Could "Did you go to the park?" also be accepted?

[ibisc]

No, that would be a different tense, the simple past, rather than the present perfect:

• Est ti i'r parc ddoe? Did you go to the park yesterday?

• Aethoch chi i'r parc ddoe?

• Wyt ti wedi mynd i'r parc yn ddiweddar? Have you been to the park recently?

• Dych chi wedi mynd i'r parc yn ddiweddar?