Sentence fragments and run-ons are two sides of the same coin. Fragments are incomplete thoughts — sentences missing a critical piece that leave the reader stranded mid-idea. Run-ons are the opposite: two or more complete thoughts crammed together without proper punctuation, forcing the reader to untangle where one idea ends and the next begins. Together, they account for 5 to 8 questions on every ACT English test. The good news is that the test makers rely on the same patterns repeatedly. Once you learn to recognize them, these questions become some of the most predictable and reliable points available to you.
Sentence fragments and run-ons are two sides of the same coin. Fragments are incomplete thoughts — sentences missing a critical piece that leave the reader stranded mid-idea. Run-ons are the opposite: two or more complete thoughts crammed together without proper punctuation, forcing the reader to untangle where one idea ends and the next begins. Together, they account for 5 to 8 questions on every ACT English test. The good news is that the test makers rely on the same patterns repeatedly. Once you learn to recognize them, these questions become some of the most predictable and reliable points available to you.
A fragment is a group of words punctuated like a sentence that fails to actually be one. It trips up test takers because fragments often sound perfectly fine when read quickly — your brain naturally fills in the missing pieces without you noticing.
Every complete sentence needs three things. First, a subject: the who or what the sentence is about. Second, a main verb: what the subject does or is. Third, a complete thought: an idea that stands on its own without leaving the reader waiting for more. Think of these as the three legs of a stool. Remove any leg and the whole thing collapses. Take away the subject and the action floats with no actor. Take away the verb and the subject sits inert. Keep both but start with a subordinating word like "because," and the thought leans on a wall that is not there.
The ACT draws from six fragment patterns. Learning to recognize each one by sight is the fastest path to easy points.
Type 1, the missing subject: The fragment describes an action but never says who performs it. "Ran to the store before it closed" has a verb but no actor. Fix: "She ran to the store before it closed."
Type 2, the missing verb: The fragment names something but never says what it does. "The brilliant student with the highest score in the entire class" paints a picture, but nothing happens. Fix: "The brilliant student with the highest score in the entire class won the scholarship."
Type 3, the dependent clause standing alone: This is the most frequently tested pattern. A dependent clause has a subject and a verb, so it looks complete. But a subordinating word at the front, something like "because," "although," "when," or "if," makes the thought incomplete. "Because it was raining heavily outside" has a subject and verb, but the word "because" leaves you asking, "What happened?" Fix: "Because it was raining heavily outside, the game was postponed." Key subordinating words to memorize: because, although, though, even though, while, when, whenever, since, until, unless, before, after, if, as, where, whether, once, and so that.
Type 4, the participial phrase: An -ing or -ed verb form cannot serve as the main verb without a helping verb. "Students studying for hours in the library" looks like it has a verb, but "studying" is functioning as a modifier, not the main verb. Fix: "Students were studying for hours in the library" or "Students studying for hours in the library earned top marks."
Type 5, the list fragment: Phrases beginning with "such as," "for example," or "including" provide details but contain no independent clause. "Such as biology, chemistry, and advanced physics" needs a home: "She enrolled in several science courses, such as biology, chemistry, and advanced physics."
Type 6, the appositive fragment: An appositive renames or describes a noun, and long ones get mistaken for sentences. "A gifted surgeon known for pioneering minimally invasive techniques" has no main verb. Fix: "Dr. Patel, a gifted surgeon known for pioneering minimally invasive techniques, led the operation."
Deep in the Sahara Desert, the ancient city of Timbuktu holds a treasure more valuable than gold: hundreds of thousands of manuscripts dating back to the thirteenth century. These texts, they contain knowledge on subjects ranging from astronomy and mathematics to poetry and Islamic law. For centuries, families have guarded these manuscripts, passing them down through generations despite wars, droughts, and political upheaval.
In 2012, when extremist groups threatened to destroy these irreplaceable documents, a group of librarians and archivists launched on a daring rescue mission. Working in secret, they smuggled over 350,000 manuscripts out of Timbuktu. Transporting them by donkey cart, canoe, and truck to the capital city of Bamako. The operation, which it took months to complete, saved centuries of African intellectual heritage from destruction.
Today, efforts to preserve these manuscripts continue. Digital archivists work tirelessly to scan and catalog each document, however the task is monumental. Many manuscripts suffer from damage caused by sand, insects, and the passage of time. Conservators, applying techniques both ancient and modern, carefully restore fragile pages that might otherwise crumble at a touch. Their work ensures that future generations will have access to this remarkable collection of human knowledge.
Here is a secret about verb tense questions on the ACT: you already use perfect verb tenses every day without thinking about it. You will say something like "She had been talking to him before they were dating, and now they are together" without breaking a sweat. That sentence contains past perfect, simple past, and present tense all in one breath. The ACT is not testing whether you know how verb tenses work. It is testing whether you can spot when a tense is wrong in a formal passage where casual speech habits might mislead you. These questions show up 5 to 8 times per test, making up roughly 10 to 16 percent of your English score. The patterns are predictable, the rules are learnable, and once you see how the test constructs its traps, you will answer them quickly and confidently.
The dead giveaway: an underlined verb appears in the passage, and the four answer choices offer different tenses of the same verb. If the underlined word is "launches," the choices might be "launches," "launched," "had launched," and "will launch." Three or four different tenses of one verb is the ACT's neon sign saying this is a tense question.
Once you identify the question type, your approach is systematic. Do not rely on what "sounds right" — casual speech habits can mislead you. Instead, look at the evidence in the passage. Read the full sentence and the sentences directly before and after the underlined verb. Identify the dominant tense of the paragraph by checking the other verbs. Look for time markers — specific words or phrases within about ten words of the underlined verb that signal a particular time frame. The correct answer will be the tense that maintains logical consistency with the rest of the passage.
The simple tenses form the backbone of English verb usage and account for the largest share of ACT verb questions. Think of them as the time travel trio — each one places an action at a specific point on the timeline.
Simple present captures actions happening now or general truths that are always valid. "She writes poetry" describes a habitual action. "Water boils at 100 degrees Celsius" states a scientific fact that never changes. On the ACT, present tense appears in passages discussing current situations, general observations, or universal truths. Even within a passage about historical events, a sentence stating a permanent fact should use present tense: "Galileo discovered that the Earth revolves around the sun" — the discovering is past, but the revolving is an eternal truth.
Simple past records completed actions that happened at a specific time. "She wrote a poem yesterday" tells us the writing is finished. Past tense is the most commonly tested tense on the ACT, appearing in roughly 25 percent of all verb tense questions. When a passage narrates historical events, biographical information, or completed research, simple past is almost always correct.
Simple future projects actions forward. "She will write tomorrow" predicts an upcoming action. Future tense appears less frequently, but when it does, the markers are usually obvious — words like "tomorrow," "next year," "soon," or "in the future."
Deep in the Sahara Desert, the ancient city of Timbuktu holds a treasure more valuable than gold: hundreds of thousands of manuscripts dating back to the thirteenth century. These texts, they contain knowledge on subjects ranging from astronomy and mathematics to poetry and Islamic law. For centuries, families have guarded these manuscripts, passing them down through generations despite wars, droughts, and political upheaval.
In 2012, when extremist groups threatened to destroy these irreplaceable documents, a group of librarians and archivists launches a daring rescue mission. Working in secret, they smuggled over 350,000 manuscripts out of Timbuktu, transporting them by donkey cart, canoe, and truck to the capital city of Bamako. The operation, which it took months to complete, saved centuries of African intellectual heritage from destruction.
Today, efforts to preserve these manuscripts continue. Digital archivists work tirelessly to scan and catalog each document, however the task is monumental. Many manuscripts suffer from damage caused by sand, insects, and the passage of time. Conservators, applying techniques both ancient and modern, carefully restore fragile pages that might otherwise crumble at a touch. Their work ensures that future generations will have access to this remarkable collection of human knowledge.
Imagine you are writing the ACT and you need to create the sneakiest grammar trap possible. What would you pick? Plot twist: the test makers chose parallel structure because it sounds right even when it is wrong. Think about it. When you say "I enjoy swimming, to run, and biking," your mouth does not explode. No grammar police sirens go off. It just feels slightly off. That is the genius trap, and it catches roughly 60 percent of test takers every single time. But here is where you flip the script and become the test maker's worst nightmare. These parallelism questions show up 3 to 5 times per test, making up about 6 to 10 percent of your English score. They are banking on you missing that tiny voice saying "something's weird here." What they did not count on? You learning their formula. Every parallelism error follows the same predictable patterns. Lists that do not match. Comparisons with mismatched sides. Correlative conjunctions breaking their own rules. Once you see the blueprint, you cannot unsee it. You will spot these errors like typos in your friend's text messages. Ready to think like a test maker and beat them at their own game?
Parallel structure, also called parallelism, is the principle that words, phrases, or clauses joined by a conjunction or used in a series should share the same grammatical form. Think of it like a team uniform: every player on the field wears the same jersey. If one player shows up in a basketball uniform while the rest wear football gear, something is clearly wrong. Grammatical parallelism works the same way. When you connect ideas with words like "and," "or," or "but," each idea needs to wear the same grammatical outfit.
At its core, this rule exists because matching forms create rhythm, clarity, and balance. When a sentence breaks parallelism, it forces the reader's brain to stumble mid-sentence. On the ACT, that stumble is exactly what the test is measuring.
Here is the simplest way to understand the concept:
Parallel: She likes hiking, swimming, and cycling. (all -ing forms) Not parallel: She likes hiking, swimming, and to cycle. (third item switches to infinitive)
Both sentences are understandable, but only the first one is grammatically correct.
The ACT English section tests parallelism because it sits at the intersection of grammar knowledge and reading comprehension. A student who understands parallelism demonstrates that they can analyze sentence structure, recognize patterns, and evaluate whether ideas are expressed with logical consistency.
Parallelism questions are among the most predictable on the entire test. They follow a small set of patterns, and the wrong answers almost always make the same kinds of mistakes. This predictability is your advantage. Once you learn to recognize the four main categories of parallelism errors, lists, comparisons, correlative conjunctions, and compound elements, you can answer these questions in under 30 seconds each.
Here is what makes these questions tricky: unlike a subject-verb agreement error, which often sounds obviously wrong, a parallelism error can sound perfectly natural in casual speech. "I came, I saw, and then I was conquering" does not sound terrible out loud, but it breaks parallelism because the third verb shifts from simple past tense to past progressive. The correct version, "I came, I saw, and I conquered," maintains the same verb form throughout. Training your ear to catch these subtle shifts is the single most important skill for this question type.