請gooogle slient B, youtube上教有得教,google也找得到規則,可能那個老師來的地區或從小的教育比較特別吧
Silent 'b'
The 'b' is silent in the combination 'mb' at the end of a word. For example:
bom(b)
clim(b)
com(b)
crum(b)
lam(b)
lim(b)
plum(b)er
num(b)
The 'b' is silent in the combination 'bt'. For example:
de(b)t
dou(b)t
su(b)tle
but not in some words, e.g. obtain, unobtrusive
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