SAT / ACT Prep Online Guides and Tips

The 8 Most Common SAT Writing Mistakes Students Make


I’ve worked with dozens of students as they studied for the SAT, and the writing section is often the most confusing for them. It tests a lot of grammar concepts you may not have learned in school or else haven’t studied in many years—even if you're an A student in English class, there are probably some rules tested on the SAT that you aren't familiar with.

Happily, the test asks about the same few concepts over and over again, so there aren't that many topics you really need to know. Avoiding just a few of the most common mistakes students often make can really help your score.

Let’s go through these common mistakes one at a time:

  1. Trying to listen for errors
  2. Not looking at all of the choices
  3. Misusing gerunds
  4. Allowing unclear antecedents for pronouns
  5. Fixing the original error but creating another
  6. Mixing up idioms
  7. Missing dangling modifiers
  8. Comparing non-equivalent nouns

Feature image: Terrance Heath/Flickr


#1: Trying to "Listen" for the Error

The single biggest mistake students make on SAT Writing is assuming they'll be able to catch errors by ear. However, SAT English is very different than day-to-day spoken English: SAT Writing questions routinely contain phrases that sound fine but are actually wrong or sound weird but are actually correct.

Avoid falling into this trap by making sure you know the key grammar rules you'll be tested on and how to approach the questions systematically. Check out our post on the secret to SAT writing for more details.


#2: Not Looking at All of the Answer Choices

Many students forget to check every answer choice before picking one, and this oversight really hurts their scores.

SAT Writing questions often include more than one answer that seem like they could be correct, but there will be something significantly off about all but one of them (or, in the case of Identifying Sentence Errors, only one will include a real error, even if some of the other choices seem weird). 

On SAT writing questions, make sure to always read the entire sentence, the question (for Improving Paragraphs), and all of the answer choices


body_bothwaysImage: thisisbossi/Flickr


#3: Misusing Gerunds

Gerund (-ing verbs) errors are some of the most common on the SAT Writing, and most students don't understand how to use them correctly. Let's clear up some gerund-related misconceptions:

  • Gerunds aren't actually verbs, they're nouns. Gerunds represent the action that the verb describes.
  • Gerunds seem correct, but they often indicate an error. Watch out especially for "being," which is almost always wrong when it appears.
  • Gerunds errors on SAT writing are much more common than you might think. A lot of SAT writing advice treats gerund issues as relatively rare, but they are actually quite common, because gerunds are involved in so many different types of questions.

Here are the three major types of SAT writing questions that involve gerunds:

  • Wordiness. Gerund use in Improving Sentences questions often indicates overly wordy constructions. Consider whether there's a more straightforward way to phrase the sentence.
  • Parallelism. A list of gerunds often indicates a parallelism error—check to make sure all the items in the list are the same form.
  • Fragments. Sometimes you'll see a gerund used in place of a main verb, creating a fragment.

You can find more general info about gerunds in our guide to verb forms and tenses.


#4: Allowing Unclear Antecedents for Pronouns

Pronoun agreement issues are another extremely common error. The simpler ones are easy to spot: you'll probably notice something's wrong if a sentence uses "him" to refer to "Mrs. Smith."

Slightly more complicated, and much more common, are the questions that test you on whether you can recognize if a pronoun should be plural or singular. For example, is "Every child must bring their own notebook" or "Every child must bring his or her own notebook" correct? It's the latter because "child" is singular and "their" is plural.

The trickiest pronoun agreement questions, however, deal with absent or ambiguous antecedents. (Antecedents are the nouns that pronouns take the place of.) These errors occur when it isn't clear what noun a pronoun is referring to. For example:

Incorrect: Jose and his dad were concerned about whether he could finish his project.

Correct: Jose and his dad were concerned about whether Jose could finish his project.

The first sentence is incorrect because it's unclear who he is (it could be either Jose or his dad), and the second one fixes the error by specifying that it's Jose's project.

The key rule to remember for pronoun questions is that every pronoun—including words like which and that—must have a clear noun antecedent. 

If you're confused about these concepts, you should read this full breakdown of everything you need to know about pronouns for SAT writing.


body_mistakes Image: Topher McCulloch/Flickr


#5: Fixing the Original Error but Creating Another

On Improving Sentences questions, you need to make sure that you don't inadvertently create a new issue when you solve the original error. Two key points:

  • Make sure to read all of the choices and pick the best answer, not just whichever one seems acceptable.
  • Avoid overly complicated or wordy answers—the right answer is generally the shortest grammatically correct option.

For a more in depth discussion of how to systematically approach these questions, take a look at our guide to Improving Sentences questions.


#6: Mixing Up Idioms

Idiom questions are tricky because they're the one exception to rule number one: you usually have to judge them based on what sounds right

However, idiom questions only test specific types of constructions: matching verb and preposition pairs and choosing between gerunds and infinitives (to + verb). Let's look at an example of the first type:

Incorrect: Isabella wants to go at Disneyland to ride the Space Mountain coaster.

Correct: Isabella wants to go to Disneyland to ride the Space Mountain coaster.

"Go to," not "go at," is the correct expression. Here's the same example sentence but with a gerund versus infinitive issue:

Incorrect: Isabella wants going to Disneyland to ride the Space Mountain coaster.

Correct: Isabella wants to go to Disneyland to ride the Space Mountain coaster.

Keep in mind that questions about idiomatic expressions are limited to these two types of phrases. If you see a weird-seeming word or phrase that doesn't fall into either category, it's probably correct (unless, of course, you can find another specific problem with it).

You can find more details on idioms, including a full list of common ones, here.


body_spacemountain.jpgImage: Andy/Flickr


#7: Missing Faulty Modifiers

Dangling modifiers are a relatively common topic on SAT Writing that can be very tricky to spot because they aren't obviously incorrect. This type of error occurs when a descriptive phrase at the beginning of a sentence isn't immediately followed by the noun it's modifying. For example:

While tending to the garden, a snake appeared, startling Lola.

This sentence may seem fine, but it implies that the snake is tending the garden, which doesn't make much sense. Modifiers must always be next to the thing that they're modifying. Let's look at a corrected version of the sentence:

While tending to the garden, Lola was startled by the appearance of a snake.

Now the modifier "while tending to the garden" is appropriately placed next to Lola, the person it's describing. 

Most faulty modifier questions are structured like this example, but for further exploration of modifier errors, see our full post on the topic.


#8: Comparing Non-Equivalent Nouns

Illogical comparisons are challenging because like dangling modifiers they don't come up that much outside of SAT Writing. Luckily, these questions follow a single basic rule: you can only compare equivalent things. 

For example, you can compare a golden retriever and a pug, because they're both types of dogs, but not a golden retriever and a pug's face, because one if a type of dog and the other is a dog's face. Let's look at a sentence:

Boulder High's track team is much faster than Fairview High.

What is the comparison between? "Boulder High's track team" and "Fairview High." That comparison doesn't actually make sense: the sentence is trying to say that Boulder High's track team is faster than Fairview High's track team, not faster than Fairview High.  The correct version of the sentence specifies this fact:

Boulder High's track team is much faster than Fairview High's.

Now it's clear that we're comparing the two teams.

Since you're likely to see at least one of these questions on the SAT, take a few minutes to read the complete explanation.


What's Next?

If you're worried about grammar rules, check out our guides to some of the other commonly tested topics like subject-verb agreement, pronoun case, and confusion of adjectives and adverbs.

The Improving Paragraphs are a small but important part of SAT Writing. Make sure you know the best way to approach them.

Do you often find yourself confused about the "No error" option? Learn how often it's correct and when you should pick it with our full analysis.


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Alex Heimbach
About the Author

Alex is an experienced tutor and writer. Over the past five years, she has worked with almost a hundred students and written about pop culture for a wide range of publications. She graduated with honors from University of Chicago, receiving a BA in English and Anthropology, and then went on to earn an MA at NYU in Cultural Reporting and Criticism. In high school, she was a National Merit Scholar, took 12 AP tests and scored 99 percentile scores on the SAT and ACT.

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