If "except" is at beginning of the sentence,"except for" is used,it is equal to "apart from".
i.e.
Except for/Apart from this thing,everything else is good.
All students go to cinema except John.
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If "except" is at beginning of the sentence,"except for" is used,it is equal to "apart from".
i.e.
Except for/Apart from this thing,everything else is good.
All students go to cinema except John.