到今天，所有单元音练习完毕，英语里，所有元音的发音是最难，也是最重要的，接下来一起看看双元音/ai/, /ei/, /oi/
发双元音要注意的是口型和舌位上有一个渐变的过程，由第一个元音滑倒第二个，通常第一个相对重读。
/ai/从a滑倒i，注意这里i偏向长音/i：/，试一试I think so. 刚开始练习，一定尽量夸张。渐变要明显，否则就会发音不标准了。试一试I, like, night, sky, wife.
/ei/也是一样，所有双元音的重点是渐变，第一个元音重读。注意第二个音不能省略。试一试name, age, eight, late, hate. 这里注意一下/e/的发音准确。
/oi/发音规则相同，注意第二个音/i/的口型，和/e/区分开。试一试boy, toy, noise, choice, point.
强化训练
/ei/ /ai/ /oi/
Bay buy boy
Tay tie toy
Ray right Roy
Fail file foil
Cane kind coin
I would like to make it a little later.
I would like to make it a little lighter.
I came for my toys.
I came for my ties.
Who is going to sell the boat?
Who is going to sail the boat?
词组练习
Straight to the point
Hide and seek
Day by day
It’s a pay day today.
I enjoyed her fine voice.
名言
It might take a year. It might take a day. But what’s meant to be will always find its way.