Diphthongs occur when an unstressed "i", "u", or "y-ending" appears next to another vowel in the same syllable. Their vowel sounds do not change, but they blend together to form a single syllable.
One such vowel combination, "io", is pronounced like the "eo" in the English word "video," except that it is a somewhat shorter sound. Note that when there is a written accent over the letter "i", the diphthong is "broken" and the two vowels are pronounced separately.
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