They are all Semi-vowels.
48. What letters are called Nasals?
M, N, and Ng.
49. What other term is often applied to the Semi-vowels?
Loose Consonant.
50. What letters are called Liquids?
L, M, N, and R.
51. Why are the Liquids so called?
Because of their flowing sound, which readily unites with the sound of other letters.
52. What are Sibilants?