Wouldn't 'I boxed' be ok?
dw i wedi... ('I have boxed') is a different tense - the perfect.
gwnes i focsio or bocsiais i ('I boxed') - the simple past (or preterite)
Why isn't "paffio" given as an alternative in the dropdown box
Would "I have been boxing" be an alternative here? I ask because in the present tense "I am boxing" is an alternative to "l box".
I think that'd be a different tense: 'dw i wedi bod yn bocsio'.