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Parallel structure means that ideas doing the same grammatical job use the same form. The SAT tests that rule in lists, paired conjunctions, comparisons, and sequences of verbs.
For parallel structure on the SAT, identify the matched ideas, underline the repeated frame around them, and make each item fit that frame in the same grammatical form.
Key takeaways
- Items in a series should share a form, such as three nouns or three verbs.
- With paired conjunctions, the words after each half should be grammatically parallel.
- Comparisons must compare like with like, with any necessary possessive or category repeated.
- Verbs describing coordinated actions should match in tense and construction unless the timeline requires a change.
What is parallel structure on the SAT?
Parallel structure is an alignment rule. If a sentence begins a list with to measure and to record, the third item should use another infinitive such as to compare. If it begins with gerunds, use gerunds throughout. The ideas match in function, so their grammar should make that relationship visible.
| Pattern | What must align | Quick test |
|---|---|---|
| Series | Every listed item | Read each item after the shared opening |
| Paired conjunction | The material after each half | Cover both conjunctions and compare the two frames |
| Comparison | The categories being compared | Name the noun on each side |
| Coordinated verbs | Tense and verb construction | Attach each verb to the same subject |
The SAT grammar rules guide is the parent overview across all convention families. This child covers only parallelism. The verb and agreement guide handles whether a verb matches its subject and timeline; here, the issue is whether coordinated verbs or phrases match one another.
How do series and paired conjunctions stay parallel?
- 1
Find the hinge
Circle the commas, coordinating conjunction, or paired conjunction that joins the ideas.
- 2
Expose the frame
Keep the shared opening and read it with each joined item separately.
- 3
Name each form
Label the items noun, infinitive, gerund, clause, or finite verb.
- 4
Repair the outlier
Choose the option that makes the mismatched item follow the established pattern without changing meaning.
Paired conjunctions include both ... and, either ... or, and not only ... but also. The grammatical material after the first half predicts the material after the second. “The device is useful both in the studio and in the field” pairs two prepositional phrases. Moving both before useful would instead demand two parallel complements of useful.
“The role requires patience, accuracy, and to communicate clearly” lists three relevant qualities, but the third item is an infinitive while the first two are nouns. Relevant is not yet parallel.
How do comparisons compare like with like?
A comparison should place equivalent categories on both sides. Compare a writer's essays with another writer's essays, not with the other writer as a person. Repeating a possessive or a category noun often repairs the logic: “Amina's approach differs from Jorge's” compares one approach with another because Jorge's stands for Jorge's approach.
Mismatched comparison
The rainfall in Harbor County was greater than Pine County.
Matched comparison
The rainfall in Harbor County was greater than that in Pine County.
Watch the logic of than and as as well as the grammar. A sentence can be neatly parallel while comparing the wrong populations. Name the exact entity on each side before deciding that the shorter choice is automatically cleaner.
How do parallel verb forms work?
When one subject performs several coordinated actions in the same time frame, the verbs should share tense and construction: “The analyst gathered the samples, recorded the temperatures, and compared the results.” A shift is justified only when the sentence supplies a real change in time or relationship.
The same rule applies to longer phrases. If a sentence says a policy aims to reduce delays and to improve access, keep both infinitives. If to is shared before the first item, read the opening with every later item to confirm that the frame still works.
Can you solve one parallel structure question?
During the field study, the interns cataloged leaf samples, recorded daily temperatures, and .
Which choice completes the text so that it conforms to the conventions of Standard English?
Find the shared frame, label each matched part, and repair the one item that refuses to line up.
Practice parallel structure →Frequently asked questions
- What is parallel structure on the SAT?
- Parallel structure means that words, phrases, or clauses doing the same grammatical job use matching forms so their relationship is clear.
- How do I fix a nonparallel list?
- Identify the grammatical form established by the first items, then revise the outlier so every item fits the same shared sentence frame.
- How do paired conjunctions work with parallelism?
- With both and, either or, and not only but also, the material following each half should have the same grammatical form and function.
- What does comparing like with like mean?
- The two sides of a comparison should name equivalent categories, such as one person's method and another person's method rather than a method and a person.