Lack of Parallel Structure
Sentences that lack Parallel Structure must be revised so that actions or items in a pair or list have the same grammatical structure.
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--The surgeon operated quickly and with care.
--The surgeon operated quickly and carefully.
This sentence is parallel because both items are adverbs.
--The surgeon operated with speed and with care.
This sentence is parallel because both items are prepositional phrases.
--The surgeon operated withspeed and care.