are divided into two groups: stops and semi-vowels. The more pure consonants
are given the label Stops and the less pure consonants given the label
Semi-Vowels. A stop requires a full restriction of air before the sound
Pronounce the letters 'p' (a stop), 'm' (a semi-vowel) and 'e' a vowel. It
will be clear why the term 'Stop' is used for a letter like 'p.' Air must
be restricted (or stopped) before the sound can be created, unlike the letters
called Semi-vowel and Vowels.