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i think this sentence doesn't accept by the academic readers as some phrases are repeating so that looking for some modifications.

Alternatively, users can decide for which application this approach is sufficient and for which application is not sufficient.

any suggestion for a case like this... thanks

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closed as off topic by simchona Nov 8 '12 at 17:58

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The repeated phrase is not a problem, but the grammar is deficient. The final "is not sufficient" is missing a required subject. –  Mark Beadles Nov 8 '12 at 18:23
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@Carlo_R. In this particular case you do need at least the dummy subject it. You could elide the predicate adjective as: "and for which application it is not (sufficient)" but you need to keep the subject, otherwise the "is" wants to bind to "application". –  Mark Beadles Nov 8 '12 at 18:56
    
thanks for both of you. the comments made me clear. –  gnp Nov 8 '12 at 21:05
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"Users can decide for which application this approach is or is not sufficient." Brevity. –  RegDwigнt Nov 8 '12 at 21:56
    
@ RegDwighт: thanks.. it is fine –  gnp Nov 8 '12 at 22:35