Italian vowels are A, E, I, O, U as in English, but pronounced differently. In Italian vowels are pronounced clearly, and also when grouped together, they are always pronounced separately, maintaining the sounds of the individual vowels, as in English 'Australia' [a-u-stra-li-a].

Pronunciation errors made by English speakers are predictable and the 80% of them involves the vowels pronunciation. Because of that, it's essencial to learn how to pronounce vowels correctly in order to avoid fossilization, the process in which mistakes become a habit and difficult to be corrected.