English Sounds - AI [aɪ] Diphthong - How to make the AI as in BUY Diphthong

In this American English pronunciation video we're  

going to learn how to pronounce the AI as in buy diphthong.

Diphthongs are a combination of two sounds so  they have a starting position and an ending  

position. In the first position the jaw is more  dropped than in the second position. The back  

of the tongue stretches up a little bit as  the mouth moves into the second position, the  

jaw drops less as the front part of the tongue  arches up towards the roof of the mouth for both  

the beginning and the end of this diphthong the  tongue tip touches the back of the bottom front  

teeth. Let's watch up close and in slow motion  where you can really see the front part of the  

tongue arching up. The jaw drops and the front part  of the tongue stays down with the tip touching the  

back of the bottom front teeth. Immediately, the  tongue moves into the second position the top  

front arching up towards the roof of the mouth. As  the tongue arches up there's less jaw drop here's  

the word high. Jaw drops with the front of the  tongue down then the jaw lifts as the front of  

the tongue arches towards the roof of the mouth.  In a stressed syllable the I diphthong curves up  

then down. High, I. In an unstressed syllable it's  lower and flatter and pitch as well as quicker  

and quieter. I, I. The diphthong is unstressed in  the word idea. I. let's take a look at this word. 

The jaw drops but just a little bit less than  it would in a stressed syllable. Then the tongue  

arches up towards the roof of the mouth before  the tip goes to the roof of the mouth for the D.

The Ai diphthong stressed. Hi, I. The I diphthong unstressed. Idea

Ai

Example words repeat with me

exercise 

wine

bright

guy

allies

sky