This is actually a bone of some contention. An abstract of a journal article on the 'problem' concludes: both " 'except' and 'except for' can be used to mean 'with the exception of', but when it is used to mean 'if it were not for' only 'except for' can be used. ' " Several dictionaries treat the phrase as an idiom: Idiom: except for: Were it not for: 'I would join you except for my cold' .
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