英语单词中不发音的辅音字母(silent consonant in words)
1-. kn, gn, pn 开头的单词，只有n 发音。
Know /n/ Knapsack, knave, knead, knee, kneel, knelt, knife, knight, knit, knob, knock knowledge, knuckle
Gnaw /n/ Gnarl, gnash, gnat, gnome, gnu
Pneumonia /n/ Pheumatic, pneumonic
2-. wr, rh 开头的单词，只有r 发音
Write /r/ Wrack, wrangle, wrap, wrath, wreck, wrench, wrestle, wretched, wring, wrinkle, wrist. write, wrong, wrung
Rhyme /r/ Rhapsody, rhetorical, rheumatic, rhinestone, rhinoceros, rhododendron, rhombus, Rhubarb, rhythm
3-. wh 开头的的三个单词，只有h 发音。
Who/h/ whom, whose
4-. ps开头的单词，只有s 发音
Psychic /s/ Psalm, pseudo, pseudonym, psoriasis, psyche, psychedelic, psychiatrist, psychic, psychoanalysis, psychoanalyze, psychological, psychologist, psychopathic, psychosis, psychosomatic, psychotherapy
5-. h 开头，e, o 紧跟的单词（ho,he）,h 不发音
Hour /h 不发音/ Heir, herb, honest, honesty, honorable, hour
6-. mb, mn 结尾的单词，只有m 发音
Climb /m/ Comb, crumb, dumb, lamb, limb, numb, plumber, thumb
Autumn /m/ Condemn, solemn, column,
7-. lk 结尾，跟着元音a 或o后面的单词（alk, olk），只有k 发音
Folk /k/ Balk, caulk, chalk, polka, stalk, talk, walk, yolk
8-. stle 结尾的单词，t不发音，只有sle 发音。
Castle /sl/ Rustle, Thistle, Whistle, Wrestle,
9-. st 在词中间的时候，只有s 发音。
Listen /s/ Fasten, glisten, Christmas
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