"We had a party before we retired."
Translation:Gaethon ni barti cyn i ni ymddeol.
OK, thanks. Do all nouns that start with a "p" change to "b" in the accusative, then?
Modern Welsh does not have cases such as nominative, accusative, etc. In this pattern it is better to remember that 'the object of a conjugated verb takes a soft mutation'.
(I think that the Welsh noun case system might have vanished in the change from Old Welsh to Middle Welsh sometime in the Middle Ages, but I am not certain.)