11. Ask the students to do more practice after class and get ready for presentation during the next session Notes for Teachers Back Vowels In this unit. we will learn the back vowels in english There are six back vowels in English. The back vowels are produced by shifting the body of the tongue back from its central position. The tip of the tongue remains at the level of the lower teeth. The front and back vowels have several features in common as well as some differences Unlike the front vowels that are made with a fairly neutral lip posture, four of the back vowels are rounded. The back vowels may also be subdivided into those that are high(u: /and /), mid(0: /and/D), and low (4 /and/+/). The following is the description of the six English back vowels /u: /and /0/ /u: / and /@/ are both high, back, rounded vowels The /u: /marks the highest boundary for the back vowels, as /i: / does for the front vowels. Therefore, the tongue is retracted from its rest position and raised toward the soft palate. This vowel is quite common in the languages of the world and appears without problem in most Chinese learners. Along with /u / /e/ completes the vowels in the high back space on the vowels chart. Its corresponding front vowel is //. When making the sound, the tongue is retracted as for /u: /but not elevated to the same extent In add ition, the// vowel is not made with as much tension in the root of the tongue as /u: / The same tense/lax contrast is also seen for /i: and/&/. This sound is not found very frequently as a phoneme in the languages of the world, certainly not in Chinese Putonghua. In English, it is not very common despite the fact that it appears in some frequently used words,such as should, good, and book /u. occurs at all the three positions of a word while /@/occurs only in the middle position of a word, like book and hook. To ensure correct pronunciation, it is important to make the following distinction between /u: and /O/11. Ask the students to do more practice after class and get ready for presentation during the next session. Notes for Teachers Back Vowels In this unit, we will learn the back vowels in English. There are six back vowels in English. The back vowels are produced by shifting the body of the tongue back from its central position. The tip of the tongue remains at the level of the lower teeth. The front and back vowels have several features in common as well as some differences. Unlike the front vowels that are made with a fairly neutral lip posture, four of the back vowels are rounded. The back vowels may also be subdivided into those that are high (/u:/ and /☺/), mid (/:/ and / ɒ/), and low (/:/ and //). The following is the description of the six English back vowels. U: :  : /u:/ and /☺/ /u:/ and /☺/ are both high, back, rounded vowels. The /u:/ marks the highest boundary for the back vowels, as /i:/ does for the front vowels. Therefore, the tongue is retracted from its rest position and raised toward the soft palate. This vowel is quite common in the languages of the world and appears without problem in most Chinese learners. Along with /u:/, /☺/ completes the vowels in the high back space on the vowels chart. Its corresponding front vowel is //. When making the sound, the tongue is retracted as for /u:/ but not elevated to the same extent. In addition, the /☺/ vowel is not made with as much tension in the root of the tongue as /u:/. The same tense/lax contrast is also seen for /i:/ and //. This sound is not found very frequently as a phoneme in the languages of the world, certainly not in Chinese Putonghua. In English, it is not very common despite the fact that it appears in some frequently used words, such as should, good, and book. /u:/ occurs at all the three positions of a word while /☺/ occurs only in the middle position of a word, like book and hook. To ensure correct pronunciation, it is important to make the following distinction between /u:/ and /☺/: ɒ   ☺