Reading & WritingExpression of IdeasMedium frequency
SAT Reading & Writing: Parallel Structure in Compound Sentences
25+ practice questions in Praczo
What you need to know
The concept, explained
- 1
When linking two clauses with correlative conjunctions (Either/Or, Neither/Nor, Not only/But also), the grammatical structures following each half MUST match.
- 2
If you say "Either TO stay OR TO go" (infinitive/infinitive) it is parallel.
- 3
If you say "Either TO stay OR going" (infinitive/gerund) it is flawed and incorrect.
Common mistakes
- ✗ Ignoring the structure and picking a choice based entirely on how "conversational" it sounds.
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The new software update is designed not only to improve battery life but also _____
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