As I said, Portuguese is a mystery to me! But I always love to learn. Although G and R may be pronounced differently nowadays, there is a reason they are the letters 'g' and 'r', because far back enough they came from latin, and indo-european roots before that. (I'm about 50 episodes into the History of English Podcast, if you like language, you might enjoy it too. Check out Ep. 5 on the letter 'C' (which is closely related to the letter 'G', as well as 'K'))