VOWELS
by Ngân Trần Thanh
1. CLASSIFICATION
1.1. TONGUE HEIGHT
1.1.1. High vowels
1.1.2. Low vowels
1.1.3. Mid vowels
1.2. PART OF THE TOUNGE
1.2.1. Front vowels
1.2.2. Back vowels
1.2.3. Central vowels
1.3. LIP ROUNDING
1.3.1. Rounded vowels
1.3.2. Unrounded vowels
1.3.3. Neutral vowels
2. Length
2.1. Long vowels
2.2. Short vowels
3. DIPHTHONGS
3.1. CLOSING
3.1.1. Ending in [ ɪ ]
3.1.2. Ending in [ ʊ ]
3.2. CENTRING
3.2.1. Ending in [ ə ]