"Dw i eisiau ysgol Gymraeg."

Translation: I want a Welsh school.

[raestwick]

I'm guessing that is an example of soft mutation, with the 'c' sound becoming a 'g' sound?

[JakeGriffi2]

Yes it is and it's because the adjective is following the feminine noun 'ysgol'

[raestwick]

Thank you for clarifying!

[Ash473779]

The word exercise for this, where you pick the word boxes was missing the article "a". The sentence was still accepted but it wasn't grammatically correct In English