¨_Cumprimento (greeting) Here the sound of "c" is the same "k"  _Comprimento (length) Here the sound "c" is the same "k" too _ Campanha (campaign) Here the sound of "c" is the same "k" too. In others word, the vowels ( the letter "c" followed by a,o and u has the sound "k"), but when the letter "c" is this way "ç", it has sound like "s". E.g -açucar (sugar) -coçar (itch) and - março (march). And when (the letter "c" is followed by i and e it has sound like "s" too. E.g -cimento (cement) - -concertar (fix).