Here is a list of common letter combinations with silent letters. This list contains most of the silent letters that give English as a second language students difficulties.
Silent B
B is not pronounced when following M at the end of a word. climb
crumb
dumb
comb
Silent C
C is not pronounced in the ending "scle"
muscle
Silent D
D is not pronounced in the following common words: handkerchief
sandwich
Wednesday
Silent E
E is not pronounced at the end of words and usually makes the vowel long. hope
drive
gave
write
site
Silent G
G is not often not pronounced when followed by an N champagne
foreign
sign
feign
Silent GH
GH is not pronounced before T and at the end of many words thought
through
daughter
light
might
right
fight
weigh
Silent H
H is not pronounced when following W. Some speakers whisper the H before the W. what
when
where
whether
why
Silent H
H is not pronounced at the beginning of many words. Use the article "an" with unvoiced H. Here are some of the most common: hour
honest
honor
heir
herb
Pronounced H
H is pronounced at the beginning of these common words. Use the article "a" with voiced H. hill
history
height
happy
hangover
Silent K
K is not pronounced when followed by N at the beginning of a word. knife
knee
know
knock
knowledge
Silent L
L is often not pronounced before L, D, F, M, K. calm
half
salmon
talk
balk
would
should
Silent N
N is not pronounced following M at the end of a word. autumn
hymn
Silent P
P is not pronounced at the beginning of many words using the suffix "psych" and "pneu". psychiatrist
pneumonia
psychotherapy
psychotic
Silent S
S is not pronounced before L in the following words: island
isle
Silent T
T is not pronounced in these common words: castle
Christmas
fasten
listen
often
whistle
thistle
Silent U
U is not pronounced before after G and before a vowel. guess
guidance
guitar
guest
Silent W
W is not pronounced at the beginning of a word followed by an R. wrap
write
wrong
Silent W
W is not pronounced with these three pronouns: