1. Its most salient feature is its diphthongization ( rising diphthongs ). 2. Spanish has six falling diphthongs and eight rising diphthongs . 3. All of these are rising diphthong similar to the beginning of English " yule ". 4. In the majority of accents, however, the falling diphthong turned into a rising diphthong , which became the sequence. 5. Unlike the other falling diphthongs ( that is, falling from higher to lower sonority ), and are rising diphthongs . 6. Even so, those vowels should be considered " rising diphthongs " on a par with those in the next diagram. 7. Rising diphthongs like or are ambiguous, since the glide may be interpreted as either a feature of the initial or of the vowel.8. There are also a certain number of rising diphthongs , but they are not characteristic of the language and tend to be pronounced as hiatus. 9. The English word " yes ", for example, consists of a palatal glide followed by a monophthong rather than a rising diphthong . 10. It's just as easy to imagine that there is one and is more open when a monophthong and more close when part of a rising diphthong .