Changed Vowels in Thai language Part 2 | อือ อัว เออ December 18, 2020December 18, 2020 by Khruu Naam - Speak Thai Possible Here is the second part of Changed Vowels. In the first video, 4 short vowels that can change their forms were introduced. In this video, the other 3 long vowels will be introduced. Watch this video for further explanation.