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⑴ 前元音：[i:] [i] [e] [æ]
前元音发音要领：舌尖抵下齿，舌前部向硬颚抬起，双唇不要收圆。
[i:]①舌尖抵下齿，舌前部尽量向硬颚抬起。②嘴唇向两旁伸开，成扁平形。
注意：[i:]是长元音，发长元音时要比发短元音长两倍以上。
She tea easy teach sleep agree three weeks, green tea, team leaders
Seeing is believing. Jean is as busy as a bee.
[i] ①舌尖抵下齿，舌前部向硬颚抬起，比[i:]低,比[e]高。②唇形扁平，牙床开得比[i:]宽，比[e]窄。③可从发[i:]出发，将小指尖放在上下齿之间，舌前部也随之稍稍下降，即可发出[i]。
It this pig city coffee begin a big ship, bit by bit, little by litte
A little learning is a dangerous thing.
His six-year old sister is as fit as a fiddle.
[e] ①舌尖抵下齿，舌前部稍抬起，比[i:]低。②唇形中常，牙床开得比[i:]宽，上下齿间可容纳一个食指。
Egg else dress best again energy seven beds, ten desks, the next lessen
Let’s get ready for the test.
All’s well that ends well.
[æ] ①舌尖抵下齿。 ②双唇向两旁平伸，成扁平形，两齿间可以容纳食指和中指。
中元音：[ʌ] [ǝ:] [ǝ]
中元音发音要领：舌尖抵住下齿，但不如发前元音时抵得那样紧。舌身的中部隆起，扁唇（双唇不要收圆）。
[ǝ:]①舌身平放，舌中部稍抬起。②牙床开得较窗窄，双唇和发[i:]时相似。
③注意长度，不要发得太短。
Her girl first turn work prefer a dirty shirt, the third world, the worst person
The German girl prefers a purple shirt to a blue one.
The early bird catches the worm.
[ǝ] ①舌中部抬起。②牙床半开半合，唇形扁或中常。③这个音和汉语普通话轻声的“么（me）”及 “了(le)”中的短促元音“e”相似，但英语的[ǝ]在词末时发音比普通话的“e”长。
About polite forget river woman potato bread and butter, salt and pepper, again and again
The teachers will get together tomorrow.
Do you prefer the cinema or theatre?
[ʌ] ①舌中部稍抬起。②开口程度和[æ]相似，唇形扁。
③从元音[ɔ]出发，将圆唇改为扁唇，即可发出[ʌ]。
Up under cut does young enough much money, lucky in love, just for fun
Well begun is half done.
Mother told the funny story just for fun.
⑴ 后元音：[ɑ:] [ɔ] [ɔ:] [u] [u:]
后元音发音要领：①舌尖不触下齿，舌身后缩，舌后部向软颚抬起，除[ɑ:]外，双唇要收圆。
②发[ɑ:][ɔ:][u:]时要注意长度，不要发得太短。
[ɑ:] 舌尖不触下齿，口张大，舌身平放后缩。
Art army star father garden tomato a large car, half a jar, after the bath
I like to pass through the garden park.
Far from eye, far from heart.
[ɔ] ①舌尖不触下齿，口张大，舌身尽量降低并后缩。②双唇稍稍收圆。③可先发[ɑ:]，然后将舌身再稍稍向后缩，双唇稍稍收圆（不要突出）即可发出[ɔ]。
On off hot want doctor foreign cotton socks, borrow a clock, a pocket watch
The coffee is top quality.
When the shop was robbed, everybody was shocked.
[ɔ:] ①舌后部比发[ɔ]时抬得略高。②双唇也收得更圆更小，并须用力向前突出。
Always or law before caused daughter all in all, more and more, a short story
Paul’s four and can walk and talk.
The storm draws near---we ought to go indoors.
[u] ①舌尖不触下齿, 舌后部向软颚抬起,舌身后缩。 ②双唇收圆，稍向前突出。
Full look wood foot woman sugar push and pull, good books, by hook or by crook
The cook cooks good food.
The woman stood for as long as she could.
[u:] 双唇比发[u]时收得更圆更小，向前突出，舌后部比发[u]时抬得更高。
To who lose group music fruit a blue balloon, an afternoon in June, huge rooms
The news is too good to be true.
That rule is useful once in a blue moon.
参考资料：http://zhidao.baidu.com/question/181630152.html