下列字母在其後所列的單字 (當然不只這些字) 中是不發音的：
D – sandwich, Wednesday
G – sign, foreign
GH – daughter, light, right
H – why, honest, hour
K – know, knight, knob
L – should, walk, half
P – cupboard, psychology
S – island
T – whistle, listen, fasten
U – guess, guitar
W – who, write, wrong