"Fyddwn i ddim yn gwneud hwnna."

Translation: I would not do that.

[tachwedd]

Doesn't this also mean 'I will not do that'? This is getting confusing

[ibisc]

In the colloquial language, the same word byddwn/fyddwn is used in two different tenses, but for different persons - is that perhaps the source of the confusion? And of course they sound very, very similar:

• Fyddwn i ddim... - I would not....
• Fyddwn ni ddim... - We will not...

[tachwedd]

Thanks for making this clear.

[mennarempt]

Why doesn't 'gwneud' undergo soft mutation here?

[ibisc]

The linking yn here does not cause a mutation of a following verb-noun such as gwneud. There is nothing else in this particular pattern that would cause a mutation.

[mennarempt]

Thanks! I thought it was the same as the adverbial particle yn, which would cause soft mutation... Plus I'm cruising on my grammatical knowledge of medieval Welsh, which doesn't always translate correctly. Though right now I can't remember if it does mutate in medieval welsh, since the only sentence I can remember with this yn has a verbal noun starting with an h... go figure.

[ibisc]

The summary here may help -
https://www.duolingo.com/comment/13844144