"Qu" and "Cu" have the same sound... "Gu" has the pronunciation like to guess in english... In linguistic the sound "C" like casa, and "g" like guerra, are two occlusive velar letter actually both are the same letter exceptt that when you pronunciate the sound "g" the vocal chords vibrate but they don't when you pronunciate the sound "C"

qu an cu have the same pronunciation. cu in cuore (cookie in English) gu has a different pronunciation. distinguish in English has the same pronunciation of the gu in Italia

qu =哭（但必须和a，e，i，o，组成读音qua瓜 que乖 qui桂quo酷 gu =姑 cu哭