Parallelism is the use of similar structure in related words, clauses, or phrases. It creates a sense of rhythm and balance within a sentence. As readers, we often correct faulty parallelism—a lack of parallel structure—intuitively because an unbalanced sentence sounds awkward and poorly constructed. Read the following sentences aloud:
Faulty parallelism: Kelly had to iron, do the washing, and shopping before her parents arrived.
Faulty parallelism: Driving a car requires coordination, patience, and to have good eyesight.
Faulty parallelism: Ali prefers jeans to wearing a suit.
All of these sentences contain faulty parallelism. Although they are factually correct, the construction is clunky and confusing. In the first example, three different verb forms are used. In the second and third examples, the writer begins each sentence by using a noun (coordination, jeans), but ends with a phrase (to have good eyesight, wearing a suit). Now read the same three sentences that have correct parallelism.
Correct parallelism: Kelly had to do the ironing, washing, and shopping before her parents arrived.
Correct parallelism: Driving a car requires coordination, patience, and good eyesight.
Correct parallelism: Ali prefers wearing jeans to wearing a suit.
When these sentences are written using a parallel structure, they sound more aesthetically pleasing because they are balanced. Repetition of grammatical construction also minimizes the amount of work the reader has to do to decode the sentence. This enables the reader to focus on the main idea in the sentence and not on how the sentence is put together.
Tip
A simple way to check for parallelism in your writing is to make sure you have paired nouns with nouns, verbs with verbs, prepositional phrases with prepositional phrases, and so on. Underline each element in a sentence and check that the corresponding element uses the same grammatical form.
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