Historical Context & Motivation
The study of modifiers and parallel structure has deep roots in the Western rhetorical tradition. Ancient Greek and Roman orators recognized that the placement of descriptive words and the balance of grammatical forms could dramatically affect both the clarity and persuasive power of speech. Over the centuries, grammarians formalized these observations into the prescriptive rules we study today, and these rules remain central to standardized English proficiency assessments such as the ACCUPLACER ESL Language Use test. Understanding why these conventions developed helps you internalize them as logical tools rather than arbitrary regulations.
The central question these conventions address is straightforward: How do we arrange words so that every modifier clearly describes the right noun or verb, and every list or comparison uses matching grammatical forms? When writers violate these principles, sentences become ambiguous, awkward, or illogical. The ACCUPLACER ESL test asks you to detect and fix precisely these errors, so mastering this material is both a practical grammar skill and a test-preparation strategy.
Core Principles & Definitions
Before tackling specific error types, you need a firm grasp of the foundational concepts. A modifier is any word, phrase, or clause that provides additional information about another element in the sentence—functioning as an adjective or adverb. Parallel structure (also called parallelism) is the principle that items joined by coordinating conjunctions, correlative conjunctions, or comparison words must share the same grammatical form. Together, these two concepts govern how English sentences maintain clarity and balance.
Misplaced Modifier
Dangling Modifier
Squinting Modifier
Faulty Parallelism
Correlative Conjunction Parallelism
Visual Explanation — Modifier Placement
The visual principle illustrated here is the proximity rule: readers instinctively attach a modifier to the nearest grammatically eligible word. When you begin a sentence with a participial phrase (a verb form ending in -ing or -ed), the subject of the main clause must be the entity performing that action. If it is not, you have a dangling modifier. This is one of the most frequently tested patterns on the ACCUPLACER ESL Language Use section, so train your eye to check the subject immediately after every introductory modifier.
How It Works — Rules and Patterns
Modifier Rules
Modifier errors arise from three basic violations. First, a misplaced modifier occurs when an adjective, adverb, or modifying phrase is positioned next to the wrong word, leading to ambiguity or absurdity. Second, a dangling modifier occurs when the word the modifier is supposed to describe does not appear in the sentence at all, leaving the modifier 'dangling' without a logical subject. Third, a squinting modifier sits between two possible targets so that the reader cannot determine which word it modifies. Each type demands a specific correction strategy.
Parallel Structure Rules
Parallel structure requires that all elements joined by a conjunction share the same grammatical form. The rule applies in three primary contexts: lists (items connected by and or or), correlative conjunctions (both…and, either…or, neither…nor, not only…but also), and comparisons (more…than, as…as). The principle is simple: if the first item in a paired or listed construction is a gerund, every subsequent item must also be a gerund; if the first item is a noun phrase, every subsequent item must be a noun phrase, and so on.
| Pattern | Incorrect | Correct |
|---|---|---|
| List with and | She likes reading, to swim, and biking. | She likes reading, swimming, and biking. |
| Correlative: not only…but also | He not only plays guitar but also is singing. | He not only plays guitar but also sings. |
| Comparison: more…than | Running is more tiring than to walk. | Running is more tiring than walking. |
| Correlative: either…or | You can either take the bus or walking. | You can either take the bus or walk. |
Detailed Breakdown — Error Classification
Common Modifier Errors by Type
| Error Type | Signal Phrase | What to Check |
|---|---|---|
| Dangling Participle | Sentence starts with -ing or -ed phrase | Does the subject after the comma perform the action in the phrase? |
| Misplaced Adverb | only, almost, nearly, even, just | Is the adverb next to the word it limits? |
| Squinting Modifier | Adverb between two verbs or two clauses | Could the modifier logically describe either side? Move it. |
| Misplaced Relative Clause | who, which, that placed far from antecedent | Does the clause immediately follow the noun it modifies? |
On the ACCUPLACER ESL test, these error types frequently appear in sentence-completion and error-identification formats. The test may present a sentence with one underlined portion and ask you to select the revision that fixes the modifier or parallelism error. Recognizing the signal phrases in the table above—especially introductory participial phrases and limiting adverbs like only and almost—will help you quickly identify which error type you are dealing with and apply the appropriate fix.
Worked Example — Identifying and Correcting Errors
Common Pitfalls & How to Avoid Them
| Pitfall | Why It Happens | How to Fix It |
|---|---|---|
| Fixing a dangle by adding a word to the phrase instead of the clause | Writers try to edit the modifier phrase itself rather than rewriting the main clause. | Always check the main-clause subject first; it must match the implied doer in the modifier. |
| Mixing infinitives and gerunds in a list | In casual speech, mixing forms sounds natural, so writers don't hear the error. | Identify the form of the first item, then ensure every subsequent item matches. |
| Ignoring parallelism with correlative conjunctions | Writers focus on the meaning and forget that the grammar after each part of the pair must match. | Draw a line from each part of the pair to its complement; the complements must be identical forms. |
| Misplacing "only" in everyday speech patterns | In spoken English, "only" often floats freely without causing confusion. | In formal writing and on the test, place "only" directly before the word it restricts. |
Connection to Advanced Writing & Academic Contexts
Mastering modifiers and parallel structure on the ACCUPLACER is a gateway to the more complex syntactic demands of academic writing at the college level. In research papers, proper modifier placement ensures that complex noun phrases with multiple prepositional attachments remain unambiguous. In persuasive essays, parallel structure becomes a rhetorical tool that lends rhythmic emphasis and logical force to your arguments—consider the lasting power of constructions like "government of the people, by the people, for the people." What begins as error correction on a placement test evolves into a hallmark of polished academic prose.
| ACCUPLACER Level | Academic Writing Level |
|---|---|
| Correct a dangling participle in a single sentence. | Manage modifier placement across multi-clause sentences with appositives, relative clauses, and participial phrases. |
| Fix a three-item list with mixed forms. | Sustain parallel structure across an entire paragraph when outlining a multi-point argument. |
| Place "only" or "nearly" next to the right word. | Use adverb placement strategically to control emphasis, tone, and nuance in formal registers. |
| Recognize errors in correlative conjunction pairs. | Deploy correlative conjunctions as rhetorical devices for balance and emphasis in thesis statements. |
As you progress into college-level composition courses, you will encounter style guides and writing handbooks that treat modifier precision and structural parallelism as non-negotiable features of clear academic communication. The skills you build now serve as the grammatical scaffolding for everything from lab reports and literary analyses to graduate-level research proposals.
Practice Problems
Lesson Summary
This lesson covered the two major grammar concepts tested in the ACCUPLACER ESL Language Use section under the Meaning domain: modifier errors and parallel structure. You learned to distinguish three types of modifier problems— misplaced modifiers (too far from the target word), dangling modifiers (target word missing from the sentence), and squinting modifiers (ambiguously placed between two possible targets)—and to correct each by repositioning the modifier or rewriting the main clause. You also learned the proximity rule: readers attach a modifier to the nearest grammatically eligible word, so placement is everything.
For parallel structure, you practiced the core rule: all items in a list, correlative conjunction pair, or comparison must share the same grammatical form—whether gerunds, infinitives, noun phrases, or clauses. The worked example demonstrated how to diagnose and fix both a dangling modifier and a parallelism error in a single sentence, reflecting the kind of combined-error questions you may encounter on the test. Use the signal phrases and the decision flowchart from this lesson as quick-reference tools during your ACCUPLACER preparation.