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Lip Position
When the front or the back of the tongue is raised high towards the palate the vowel is called close. They are - [ i: I u u:]. When the tongue is in the back part of the mouth but is slightly advanced and the central part of it is raised towards the front part of the soft palate a back-advanced vowel is pronounced. It is - [U]. When the tongue is in the front part of the mouth but slightly retracted and the part of the tongue nearer to the centre than to front is raised, a front-retracted vowel is pronounced. It is - [i]. The stability of articulation All English vowels are divided into 3 groups: monophthongs, diphthongs, diphthongoids. The classification of english vowels - Vowels are normally made with the air stream that meets no obstruction in the mouth, pharyngeal and nasal cavities. - On the articulatory level the description of vowels notes changes:
1. in the stability of articulation 2. in the tongue position 3. in the lip position 4. in their length
Monophthongs are vowels the articulation of which is almost unchanging. In the pronunciation of diphthongs the organs of speech glide from one vowel position to another within one syllable. The starting point, the nucleus, is strong and distinct.
Tongue Position 1. When the tongue is in the front part of the mouth and the front part of the tongue is raised to the hard palate a front vowel is pronounced. 3. When the front of the tongue is raised towards the back part of the hard palate the vowel is called central. 4. When the tongue is in the back part of the mouth and the back of it is raised towards the soft palate a back vowel is pronounced. Moving up and down in the mouth the tongue may be raised to different height towards the roof of the mouth. 2. When the front or the back of the tongue is as low as possible in the mouth open vowels are pronounced. 3. When the highest part of the tongue occupies the position intermediate between the close and the open one mid vowels are pronounced. When the lips are neutral or spread the vowels are called unrounded. When the lips are drawn together so that the opening between them is more or less round the vowel is called rounded.
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