IN CASE :
In case expresses the possibility of something happening.
It is used to express the idea of doing something to avoid
a possible
problem later on.
It gives the reason for an action.
► Take an umbrella with you in case it rains.
= There is a possibility that it will rain, so it's a good idea to take
an
umbrella.
In case
+ 'of'
In case of = if there is
► In case of emergency, call this number.
= If there is an emergency, call this number.
UNLESS :
Unless means 'except if' or 'only
if''.
Unless replaces 'if' + a negative verb.
► Mary won't come unless you invite Tom.
= Mary won't come except if you invite Tom..
= Mary will only come if you invite Tom.
= If you don't invite Tom, Mary won't come.
► We will have a picnic unless it rains..
= We will have a picnic except if it rains.
= If it doesn't rain, we will have a picnic.
= If it rains, we won't have a picnic.
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