ISBN-13: 9783330974173 / Angielski / Miękka / 2017 / 84 str.
In order to understand how vowels work, we need to know a little bit about the physical apparatus that are used to produce them. Vowels are formed by giving an outward air stream and vibrating vocal cords, and what distinguishes vowels from each other auditory is the precise shape and volume of the oral cavity, and the main organ involved in adjusting the shape and volume is the tongue. Therefore, this shape and volume of tongue gives vowel phase clarity