Lesson 21 - Vowels ( ໄ , ໃ ) 2018-05-12 · 30 words · 1 minute read language Lesson 21 - Vowels ( ໄ , ໃ ) Below: Use the audio and pdf together. Your browser does not support the audio element. This browser does not support PDFs. Please download the PDF to view it: Download PDF. Older Lesson 20 - Vowels ( ຸ , ູ ) Newer Lesson 22 - Vowels (ເ , ເ ະ, ເັ )