Parallelism

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In English, series of two or more items (be they clauses, phrases, or single words) like to be similar. In other words, when lining up multiple items, line up apples with apples, not apples with baseball bats. Aim to express similar ideas in similar grammatical manners. This is what we call parallelism.

You should have parallel structure in three instances:

When using coordinating conjunctions (For, And, Nor, But, Or, Yet, So)

When using correlative conjunctions (not only... but also; neither... nor; either... or; both... and)

Note! For your sentence to be parallel, the correlative and coordinating conjunctions should go directly before the parallel terms.

When comparing or contrasting

Implicit in comparisons or contrasts or lists is a need for consistency of subject and verb (tense, number, mood).

Adapted from Lydia Fash, University Writing Program, 2009, 2020.