I have wondered for a long time about the difference between "except" and "except for" . I would appreciate if you could tell me.
'Except (for)'-- that is, either form, is used anywhere except before infinitives, conjunctions and prepositions-- when 'except' is normally used.
can we say it is like "apart from" or "other than" ?
or is there any difference between them?
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They all seem to work in the sentences I can imagine, Seyf-- let us know if you find any questionable cases.
"apart from being colleagues, we spend most of our time together".

"apart from its title, this book has a lot to offer."

here apart from is closer in meaning to "in addition to".

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Yes, it does. And yet another meaning in 'keeping mothers apart from their children is cruel'.
Thank you Mr.Micawber and Seyfihoca for your help. I have another question. Is there any difference in meaning apart from that in usage?
Example, He did very well on the exam except (for) a few mistakes. Does "except for" has the meaning of "only", or "just"?
Example: Everyone except (for) David is going to the party. Does "except" mean "David is exceptional"?
Thank you for your help.
Well, for one thing, you have hit upon an example for which only 'except for' is possible:

'He did very well on the exam except for a few mistakes.' The 'for' seems to be required because 'mistakes' requires a different verb: not 'do' but 'make'-- 'He did very well on the exam except for (making) a few mistakes.' Having said that, 'except for' means 'not including', not 'just/only'.

'Everyone except (for) David is going to the party.' -- here, 'except (for)' means merely that David is not among those who are going. The adjective 'exceptional' is normally used to mean 'out of the ordinary'.
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