SAT Parallel Structure: Matching Form in Lists, Series, and Comparisons

Parallel structure means items in a list or comparison use the same grammatical form. Instead of "The candidate is intelligent, hardworking, and someone who listens," correct parallel structure is "The candidate is intelligent, hardworking, and attentive." All three adjectives match in form and grammatical role. Breaking parallelism confuses readers and creates awkwardness. The SAT frequently tests this rule in grammar questions.

Parallel structure appears in lists (using commas), comparisons (using "as...as," "more...than," "both...and," "either...or"), and series with coordinating conjunctions. Once you understand the principle (match the form), recognizing errors becomes fast and identifying corrections becomes obvious.

When you see a list or comparison, check whether all items match grammatically. For example, "The team practices tackling, passing, and to communicate strategies" breaks parallelism: "tackling" and "passing" are gerunds, but "to communicate" is an infinitive. Correct it to "The team practices tackling, passing, and communicating strategies." The correction matches all three forms.

Practice identifying non-parallel items in 10 sample sentences. Mark where parallelism breaks and rewrite to match forms. Build the habit of checking lists and comparisons for consistency. Most students catch parallelism errors quickly once they understand the principle.

To fix parallelism, identify which form dominates the list. If two items use gerunds (noun-ing) and one uses an infinitive (to verb), change the infinitive to a gerund to match. If two items are nouns and one is an adjective, change the adjective to a noun. The principle is always the same: make all items in the series match the dominant form.

Build the correction habit by practicing rewrites. Take five non-parallel sentences and correct them to match forms throughout. After correcting 20-30 sentences, your brain learns the pattern and you will spot errors automatically on test day.

Spend five minutes daily correcting sentences that break parallel structure. Start with sentences that break parallelism obviously (like the examples above), then move to subtle breaks (matching tense, matching voice, matching structure in complex comparisons). After two weeks of daily practice, spotting and correcting parallelism errors becomes automatic.

Once automaticity is built, integrate parallel structure checking into your normal passage review. When you edit any written passage during practice, check every list and comparison for parallel structure. This habit prevents parallelism errors from appearing in your own writing and helps you catch them in multiple-choice grammar questions.