开合双元音（也有人叫做合口双元音）有/eɪ/ /aɪ/ /ɔɪ/ /aʊ/ /əʊ/发音时舌位从第一个元音（前元音/e/、中元音/ə/、后元音/a/、/ɔ/分别滑向第二个元音/ɪ/ /ʊ/）。因为这五个双元音的第二元音/ɪ/、/ʊ/是合口元音，因此我们把这五个双元音叫做合口双元音。其发单特点是口型由开口滑到合口。开口，合口的意思简单的说就是嘴巴张开，收拢的意思。
开合双元音(1) /eɪ/
发音要点：
发双元音/eɪ/时，口型由/e/向/ɪ/滑动，下巴向上合拢，舌位随之抬高。注意双元音的发音特点是前重后轻、前长后短。
音标体验：
a table a plate
a cake a radio
对话演练(Dialogues)
A:What abeautiful cake!
B:yes,it's Kate's birthday cake.
A:How old is she?
B:She is eighteen today.
A:Happy birthday to Kate.
发[eɪ]这个音的字母和字母组合a,ai,ay
a: cake make name game snake gate lazy
ai: rain train wait
ay: day May play taday way
根据发音规则，圈出下列单词中发音不一样的单词。
1. face wave sheep tail
2. grape plane name coat
3. time tape train snake
4.rain soap cake train
开合双元音(2) /aɪ/
发音要点：
发双元音/aɪ/时，由舌位低、口形大的前元音/a/向舌位高、口形小的/ɪ/滑动。发音时舌尖要抵住下齿。
音标体验：
a kite a knife
对话演练(Dialogues)
A:It's not easy to make a dinner for six,including Mike.
B:Don't worry.I could give you a hand.My meat pies are terrific.
A:Ok. You could make six meat pies for us as the main dish.
B:That would be my pleasure.
发/aɪ/这个音的字母和字母组合i,y,ie,uy
i:kite bike nice tiger write knife
y:by cry fly my sky try why
ie:tie pie
uy:buy
根据发音规则，找出每组中发/aɪ/的2个单词。
1.rice good jam right
2.ship mine ice-cream mouse
3.cloud sit tie eye
4.write small tennis kite
开合双元音(3) /ɔɪ/
发音要点：发双元音/ɔɪ/时，由后、低元音/ɔ/向前、高元音/ɪ/滑动，口形由开、圆逐渐变为合、扁，尾音短促。
音标体验：
a boy; a toy;
a gold coin; a bottle of oil;
a boild egg; a lot of noise;
对话演练(Dialogues)
A: I want to buy a toy for Roy.
B: For Roy? You want to buy him another toy?
A: Why not? He enjoys playing with toys。
B: He enjoys destroying toys. You'd better not to spoil the boy.
朗读下列语句，注意发好双元音/ɔɪ/
1) Come and enjoy the toys.
2) Let us join hands in friendship.
3) It's a joy to watch the boy playing with his toy.
发/ɔɪ/这个音的字母和字母组合oi,oy
oi: oil boil coin
oy: boy toy
根据发音规则，长出每组中发/ɔɪ/ 的2个单词.
1. soil hear soy cold
2. rabbit bed boy noise
3. walk voise boil word
4. tea enjoy toy milk
开合双元音(4) /aʊ/
发音要点： 发双元音/aʊ/时，由舌位低，口形大的前元音/a/向舌位高、口形小的后元音/ʊ/滑动，结束时双唇收圆稍向前突。
音标体验：
a cow; a mouse; a house;
对话演练(Dialogues)
A:Nice to meet you ,Mrs. Brown.
B:Nice to meet you ,too. Mr. Howa
A:Listen! Who's shouting?
B:That's my son singing. But he sounds like he's shouting.
朗读下列语句，注意发好双元音/aʊ/
1）Brown spends hour after hour among his flowers.
2) Get out of my house now.
3) How about going downtown,now?
发/aʊ/这个音的字母和字母组合ou,ow
ou: house mouse mouth trousers
ow: flower cow how now down
根据发音规则，选出不发/aʊ/的单词
1. mouse cloud arm clown
2. teacher trousers cow mouth
3. town dance flower house
开合双元音(5) /əʊ/
发音要点： 发双元音/əʊ/时，口型由中元音/ə/向/ʊ/滑动，双唇由扁平变为合圆形，到/ʊ/的位置就停止发音。
音素体验:
a nose a potato
a home a tomato a boat
对话演练(Dialogues)
A:Joe,today you make supper for us,I've got a little headache.
B:Ok,Rose.Where're the potatoes,I can't find them.
A:They are in the bag under the table
B:Oh,here they are.But where are the tomatoes Rose?
A:The tomatoes?They're in the bowl in the cupboard.
朗读下列语句，注意发好双元音/əʊ/。
1) Don't go home alone,Joan.
2) I hope nothing is wrong.
3) I know what you know.
发/əʊ/这个音的字母和字母组合o,oa,ow
o:nose rose poen over
oa:boat coat soap goat
ow:show window snow bowl
根据发音规则，圈出每组中发/əʊ/的2个单词。
1、coat goat tree river
2、make window knife road
3、your white row coat
4、boat hen nose lamp