if provided providing assuming等词都有如果的意思，都可引导条件状语从句；
in case以防；lest以免；unless除非；as long as只要；once一旦；as soon as只要……就……
不知道这些够不够？
if
if ....not
unless
in case
lest
provided
as long as
addition
except
as long as
unless
in case of
once......
if
in case
lest
provided
as long as
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