Modifiers & Parallelism
Master ACT modifiers and parallelism: fix dangling and misplaced modifiers and keep lists, comparisons, and verbs in matching grammatical form.
What you'll do in this lesson
A voice-first session with the Crimsora tutor on Modifiers & Parallelism, then targeted practice and FRQs — with the tutor adapting to where you get stuck.
What this lesson covers
On the ACT English test, some of the trickiest usage questions never mention grammar rules at all — they just underline a phrase and expect you to hear what sounds wrong. Two of the most commonly tested patterns are modifier placement and parallel structure. A misplaced word can accidentally claim that a chandelier was walking down the stairs, and a broken list can make a smooth sentence collapse.
This lesson teaches you to spot when a describing phrase attaches to the wrong noun and when items in a series, comparison, or paired construction fail to match. You will learn the fixes the ACT rewards, the traps in the answer choices, and a fast checking routine you can run on test day.
This lesson teaches you to spot when a describing phrase attaches to the wrong noun and when items in a series, comparison, or paired construction fail to match. You will learn the fixes the ACT rewards, the traps in the answer choices, and a fast checking routine you can run on test day.
How Modifiers Work — and Fail
A modifier is a word or phrase that describes something else in the sentence. The core rule the ACT tests is simple: a modifier must sit next to the word it describes. When it does not, you get one of two errors.
A misplaced modifier is positioned so it seems to describe the wrong noun. Consider: "She served sandwiches to the children on paper plates." Were the children on paper plates? Moving the phrase fixes it: "She served sandwiches on paper plates to the children."
A dangling modifier describes a noun that isn't even in the sentence. This happens most often with introductory phrases. "Walking to school, the rain soaked my jacket." The rain wasn't walking — but no walker appears as the subject. The ACT almost always fixes danglers by changing the subject that follows the comma: "Walking to school, I got my jacket soaked by the rain."
The key insight: whatever noun immediately follows an introductory modifier is what that modifier describes. On the ACT, when a sentence opens with an -ing or -ed phrase followed by a comma, immediately check that the first noun after the comma is the thing performing or receiving that action. If the answer choices swap out that subject, that's your signal a dangling modifier is being tested.
A misplaced modifier is positioned so it seems to describe the wrong noun. Consider: "She served sandwiches to the children on paper plates." Were the children on paper plates? Moving the phrase fixes it: "She served sandwiches on paper plates to the children."
A dangling modifier describes a noun that isn't even in the sentence. This happens most often with introductory phrases. "Walking to school, the rain soaked my jacket." The rain wasn't walking — but no walker appears as the subject. The ACT almost always fixes danglers by changing the subject that follows the comma: "Walking to school, I got my jacket soaked by the rain."
The key insight: whatever noun immediately follows an introductory modifier is what that modifier describes. On the ACT, when a sentence opens with an -ing or -ed phrase followed by a comma, immediately check that the first noun after the comma is the thing performing or receiving that action. If the answer choices swap out that subject, that's your signal a dangling modifier is being tested.
Parallel Structure Essentials
Parallelism means that items playing the same grammatical role in a sentence share the same grammatical form. When you join elements with a coordinating conjunction (and, or, but), a list, or a comparison, each element must match.
The ACT tests parallelism most often in three structures: a list of three or more items, a pair joined by a conjunction, and comparisons using "than" or "as." It also tests correlative conjunctions — the paired words "not only...but also," "either...or," "neither...nor," and "both...and." The grammatical form following the first half must match the form following the second half. "She not only sings but also she dances" is wrong; "She not only sings but also dances" is right.
When you see a list underlined, identify the first item's form (a gerund? an infinitive? a noun?) and force every other item to copy it. The correct answer choice is usually the one that repeats a consistent grammatical pattern.
| Element | Not parallel | Parallel |
|---|---|---|
| List of verbs | hiking, to swim, and biked | hiking, swimming, and biking |
| Noun phrases | for speed, accuracy, and being efficient | for speed, accuracy, and efficiency |
| Clauses | that he was tired and needing rest | that he was tired and that he needed rest |
When you see a list underlined, identify the first item's form (a gerund? an infinitive? a noun?) and force every other item to copy it. The correct answer choice is usually the one that repeats a consistent grammatical pattern.
How the ACT Disguises These Questions
These questions rarely announce themselves. You will see an underlined portion and four choices, with no instruction telling you what's being tested. That means you must recognize the trigger structures yourself.
Watch for these signals. An introductory phrase set off by a comma almost always cues a modifier check — verify the subject. A sentence containing "and," "or," or a comma-separated series cues a parallelism check. The words "than," "as," and correlative pairs cue comparison parallelism.
A common misconception is that the shortest answer is always best. Conciseness matters elsewhere, but a parallelism fix sometimes requires adding a word, such as repeating "to" or "that." Don't reject a longer choice just for length if the shorter ones break the pattern.
Another trap: the ACT offers choices that fix one problem while sounding awkward or introducing a new one. Read the whole sentence with your chosen answer plugged in. For danglers, the wrong answers typically just rearrange words without supplying the missing actor. The right answer changes the subject so the introductory phrase finally has something logical to describe. Training your eye to expect a subject change after an intro phrase gives you a huge edge.
Watch for these signals. An introductory phrase set off by a comma almost always cues a modifier check — verify the subject. A sentence containing "and," "or," or a comma-separated series cues a parallelism check. The words "than," "as," and correlative pairs cue comparison parallelism.
A common misconception is that the shortest answer is always best. Conciseness matters elsewhere, but a parallelism fix sometimes requires adding a word, such as repeating "to" or "that." Don't reject a longer choice just for length if the shorter ones break the pattern.
Another trap: the ACT offers choices that fix one problem while sounding awkward or introducing a new one. Read the whole sentence with your chosen answer plugged in. For danglers, the wrong answers typically just rearrange words without supplying the missing actor. The right answer changes the subject so the introductory phrase finally has something logical to describe. Training your eye to expect a subject change after an intro phrase gives you a huge edge.
A Reliable Fixing Routine
Use a two-step routine whenever you suspect these errors.
Step one, for modifiers: locate any introductory or inserted descriptive phrase, then ask "Who or what is doing this?" If the nearest noun can't logically do it, the modifier is dangling or misplaced. Choose the answer that puts the correct doer right beside the phrase.
Step two, for parallelism: find the conjunction or comparison word, then list out the items it connects. Underline the first word of each item and compare their forms. If one is a gerund and another is an infinitive, or one is a noun and another a full clause, they clash. Pick the choice that harmonizes them.
Here is the quick comparison of the two error types:
Practice makes these automatic. Once you can name the trigger, the correct answer usually stands out because it is the only one that keeps every part logically connected and grammatically consistent.
Step one, for modifiers: locate any introductory or inserted descriptive phrase, then ask "Who or what is doing this?" If the nearest noun can't logically do it, the modifier is dangling or misplaced. Choose the answer that puts the correct doer right beside the phrase.
Step two, for parallelism: find the conjunction or comparison word, then list out the items it connects. Underline the first word of each item and compare their forms. If one is a gerund and another is an infinitive, or one is a noun and another a full clause, they clash. Pick the choice that harmonizes them.
Here is the quick comparison of the two error types:
| Feature | Modifier error | Parallelism error |
|---|---|---|
| Trigger | intro phrase + comma, or a describing phrase | and/or, lists, than/as, correlatives |
| Question | Does the phrase describe the right noun? | Do joined items share one form? |
| Typical fix | change the subject after the comma | match every item's grammatical form |
Key terms
- Modifier.
- A word or phrase that describes or limits another word in the sentence; it must sit next to what it describes.
- Misplaced modifier.
- A modifier positioned so that it appears to describe the wrong word, creating an illogical meaning.
- Dangling modifier.
- A modifier, usually an introductory phrase, whose intended subject is missing from the sentence entirely.
- Parallel structure.
- The principle that items serving the same grammatical role must share the same grammatical form.
- Correlative conjunctions.
- Paired connectors such as not only...but also, either...or, and both...and that require matching forms after each half.
- Gerund.
- An -ing verb form used as a noun, such as 'swimming'; must match other gerunds in a parallel list.
- Coordinating conjunction.
- A joining word (and, but, or, nor, for, so, yet) that links elements which should be parallel.
Worked example
Choose the best version of the underlined portion: "Rushing to finish the project before midnight, the deadline was met by Maria with only seconds to spare."
First, spot the trigger. The sentence opens with an introductory phrase, "Rushing to finish the project before midnight," followed by a comma. This cues a modifier check.
Ask: who is rushing? Logically, Maria is rushing. But the noun immediately after the comma is "the deadline." A deadline cannot rush to finish a project, so this is a dangling modifier — the true actor is buried later in the passive construction "was met by Maria."
To fix a dangling modifier, make the doer of the introductory action the subject that follows the comma. Rewrite so "Maria" comes right after the comma: "Rushing to finish the project before midnight, Maria met the deadline with only seconds to spare."
Now the introductory phrase correctly describes Maria, the sentence is active and clear, and no words dangle. On the ACT, the correct choice would be the one that begins the main clause with "Maria," while the wrong choices would keep "the deadline" or "it" as the subject or merely reshuffle words without supplying the actor.
Ask: who is rushing? Logically, Maria is rushing. But the noun immediately after the comma is "the deadline." A deadline cannot rush to finish a project, so this is a dangling modifier — the true actor is buried later in the passive construction "was met by Maria."
To fix a dangling modifier, make the doer of the introductory action the subject that follows the comma. Rewrite so "Maria" comes right after the comma: "Rushing to finish the project before midnight, Maria met the deadline with only seconds to spare."
Now the introductory phrase correctly describes Maria, the sentence is active and clear, and no words dangle. On the ACT, the correct choice would be the one that begins the main clause with "Maria," while the wrong choices would keep "the deadline" or "it" as the subject or merely reshuffle words without supplying the actor.
Practice questions
Which choice keeps the sentence parallel? "The internship taught her to research thoroughly, to write clearly, and ______."
- communicating with confidence
- to communicate with confidence
- that she communicated with confidence
- confident communication
Answer: to communicate with confidence
The list uses infinitive phrases: 'to research thoroughly' and 'to write clearly.' The third item must copy that form, so 'to communicate with confidence' matches. The gerund 'communicating,' the clause 'that she communicated,' and the noun phrase 'confident communication' all break the established infinitive pattern.
Explain what is wrong with this sentence and how to fix it: "Covered in fresh snow, the hikers admired the mountain peak."
Answer: The modifier 'Covered in fresh snow' dangles because it appears to describe the hikers, but the snow-covered thing is the mountain peak. Fix it by making the peak the subject: 'Covered in fresh snow, the mountain peak was admired by the hikers,' or better, 'The hikers admired the mountain peak, which was covered in fresh snow.'
The introductory phrase must describe the noun right after the comma. Since 'the hikers' follows, the sentence literally says the hikers are covered in snow. Relocating the description to the peak restores the intended meaning while keeping the sentence clear and logical.
Which revision corrects the parallelism error? "The committee valued not only creativity but also that members worked hard."
- not only creativity but also that members worked hard
- not only creativity but also hard work
- not only being creative but also members worked hard
- creativity not only but also hard work
Answer: not only creativity but also hard work
Correlative conjunctions require matching forms after each half. 'Not only' is followed by the noun 'creativity,' so 'but also' should be followed by a matching noun phrase, 'hard work.' The clause 'that members worked hard' does not match a single noun, and the other choices either mix forms or misplace the conjunctions.
FAQ
- How do I quickly tell if an ACT sentence has a dangling modifier?
- Look for a sentence that opens with a descriptive phrase followed by a comma, especially an -ing or -ed phrase. Then check the first noun after the comma. If that noun cannot logically perform the action in the phrase, the modifier dangles, and the correct answer will change the subject to the true actor.
- Does parallelism only apply to lists?
- No. Parallelism applies to any elements playing the same role: lists of three or more, pairs joined by 'and' or 'or,' comparisons using 'than' or 'as,' and correlative pairs like 'not only...but also.' Whenever items are grammatically linked, they must share the same form.
- Is the shortest answer choice always correct on these questions?
- Not for parallelism. Conciseness helps on redundancy questions, but a correct parallel structure sometimes requires repeating a word like 'to' or 'that.' Judge each choice by whether it keeps the grammar consistent and the meaning logical, not just by length.
- Will the ACT tell me which grammar rule a question tests?
- No. The questions simply underline part of the passage and offer four choices with no label. You must recognize the trigger yourself — an introductory phrase signals a modifier check, and conjunctions, lists, or comparisons signal a parallelism check.
Learn this with a teacher, not a page
The Crimsora tutor teaches Modifiers & Parallelism live — explaining on a whiteboard, asking you questions, and adapting to where you get stuck.