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Our school [not only is] unique in its emphasis on promoting respect, [but also unusual] in its commitment to providing a healthy physical environment.

 

To

Our school [is not only unique] in its emphasis on promoting respect, [but also unusual] in its commitment to providing a healthy physical environment.

 

Nonparallel structure:

When two elements in a sentence are introduced by correlative expressions (not only . . . but also; both . . . and; either . . . or), both elements must have the same grammatical structure.

 

In the first sentence above, not only is followed by a verb, whereas but also is followed by an adjective.  For parallel structure to be maintained, both expressions must be followed by adjectives.

 

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See Error Checklist for a compilation of 75 common writing errors.

For more exercises in identifying common errors,
take the M.B.A. exam and
the Punctuation and Grammar Challenges.