Errors in parallel structure can slip into our writing all too easily—and that’s especially true with correlative, or two-part, conjunctions such as both … and, not … but, not only … but also, neither … nor or either … or. When using one of these two-part conjunctions, we have to be sure to use the same part of speech (noun, verb, etc.) or the same grammatical structure (phrase, clause) after each part.
In each question below, see if you can tell whether the sentence is parallel or not.