11. Ask the students to do more practice after class and get ready for presentation during the next session Notes for Teachers Front Vowels Central Vowels In this unit, we will learn the front vowels and central vowels in English Vowels are sounds in which there is no obstruction to the flow of air as it passes from the larynx to the lips. There are 20 vowels in English, among which 12 are pure vowels and 8 are diphthongs. The English pure vowels can be classified according to 1)the height of the raised part of the tongue 2)the part of the tongue raised, and 3)the position of the lips, i.e. whether they are rounded or unrounded There are four front vowels in English: /i: //v//e/ and /8/. The reason these are called front vowels is that the tongue body is shifted forward, causing the vowels to be produced in the front of the mouth. In addition, the front vowels may be subdivided into those that are high(or close), like /i: /and //, mid like /e/, and low (or open ) like //. For the two vowels in the high front space, /i and//, the tongue is close to the hard palate. Likewise, for the low vowel /8/ the tongue is nearly flat and the lower jaw more open than for the other front vowels There are two central vowels in English: /3: and /o/ They are called central owes because they tend to be produced at a point midway between the front and back vowels and between the high and low vowels It has become traditional to locate vowels on a four-sided figure. The following is a description of the four English front vowels and two central vowels /i:/&/e, /1 / is a very common sound in the world's languages. It is made by raising the body of the tongue from its rest position and shifting it forward. The //sound is made by lowering the tongue slightly from the high-front position for /i: / Besides /i: is a much more tense sound than/v/. The fact that English has these two high front vowels, differentiated by muscle tension in the root of the tongue, sets it apart from Chinese and many languages of the world. Both /i /and /6/ can occur in initial medial, and final position in words11. Ask the students to do more practice after class and get ready for presentation during the next session. Notes for Teachers Front Vowels & Central Vowels In this unit, we will learn the front vowels and central vowels in English. Vowels are sounds in which there is no obstruction to the flow of air as it passes from the larynx to the lips. There are 20 vowels in English, among which 12 are pure vowels and 8 are diphthongs. The English pure vowels can be classified according to 1) the height of the raised part of the tongue; 2) the part of the tongue raised, and 3) the position of the lips, i.e. whether they are rounded or unrounded. There are four front vowels in English: /i:/, //, /e/ and //. The reason these are called front vowels is that the tongue body is shifted forward, causing the vowels to be produced in the front of the mouth. In addition, the front vowels may be subdivided into those that are high (or close), like /i:/ and //, mid, like /e/, and low (or open), like //. For the two vowels in the high front space, /i:/ and //, the tongue is close to the hard palate. Likewise, for the low vowel // the tongue is nearly flat and the lower jaw more open than for the other front vowels. There are two central vowels in English: /з:/ and // They are called central vowels because they tend to be produced at a point midway between the front and back vowels and between the high and low vowels. It has become traditional to locate vowels on a four-sided figure. The following is a description of the four English front vowels and two central vowels. i: /i:/ & //, /i:/ is a very common sound in the world's languages. It is made by raising the body of the tongue from its rest position and shifting it forward. The // sound is made by lowering the tongue slightly from the high-front position for /i:/. Besides, /i:/ is a much more tense sound than //. The fact that English has these two high front vowels, differentiated by muscle tension in the root of the tongue, sets it apart from Chinese and many languages of the world. Both /i:/ and // can occur in initial, medial, and final position in words. e