C, F, H, K, P, Q, S, T, X, Ch, Sh, and Wh.
73. What Combination is both Aspirate and Subvocal?
Th.
74. What are Cognate letters?
Those which are produced by the same organs of speech in a similar position.
75. Give an example of a Cognate letter.
D is a cognate of T.
76. What are Quiescent letters?
Those that are silent.
77. How many uses have Silent letters?