How do you say I agree in Welsh?

There are a few ways to say "I agree" in Welsh, depending on the context and formality:

Formal:

* Cytunaf i hynny. (This is the most direct and formal translation)

Informal:

* Rwy'n cytuno. (This is a more natural and informal way to say it)

* Yn wir. (This means "indeed" and is a common way to express agreement)

* Ie, wrth gwrs. (This translates to "yes, of course" and shows strong agreement)

Note: In Welsh, "i" is used as a preposition before a noun or pronoun, so you would say "cytunaf i ti" to say "I agree with you".

Hope this helps!