Questions regarding the various words, particles, inflections, and constructions employed to negate a word or sentence from its positive form.

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How can I use できない and しまう? I'd like to apologize for not being able to do something

I'd like to apologize for not being able to do xyz. Rather than just saying 「すみません、何々ができません。」, could I say something like: 何々ができなくてしまいます。 Or is しまう always used with a positive te-form verb?