The Classification of English Vowel Phonemes
A vowel is a voiced sound produced in the mouth with no obstructions to the
air stream. The English vowel phonemes are divided into two large groups:
monophthongs and diphthongs.
A monophtong is a pure (unchanging) vowel sound. There are 12
monophthongs in English. They are as follows: [i:], [i], [e], hhhhh
Two of them [i:] and [u:] are diphthongized (diphthongoids).
A diphthong is a complex sound consisting of two vowel elements
pronounced so as to form a single syllable. The first element of an English
diphthong is called the nucleus. The second element is called the glide (it is weak).
There are eight diphthongs in English. They are [ei], [ai], [au],hhhhhhh
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