10 Digital SAT Grammar Mistakes & How to Avoid Them

The Digital SAT Reading and Writing section includes questions that test your understanding of grammar, sentence structure, usage, and punctuation. These skills fall under Standard English Conventions, which accounts for approximately 26% of the section. (SAT Suite)

Many students lose points not because they don't know the grammar rule, but because they rush, overlook sentence structure, or choose an answer based on what sounds right. Common traps include comma splices, subject-verb agreement errors, inconsistent verb tenses, misplaced modifiers, and incorrect parallel structure.

This guide covers the most common Digital SAT grammar mistakes and simple ways to avoid them. Use these strategies with targeted practice to improve your accuracy and confidence before test day.
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Common Mistakes to Avoid in Digital SAT Grammar

•  Misinterpreting subject verb agreement
•  Ignoring verb tense consistency
•  Misusing punctuation marks
•  Confusing pronoun references
•  Overlooking parallel structure
•  Misplacing modifiers
•  Failing to recognize idiomatic expressions
•  Ignoring sentence structure errors
•  Overusing passive voice
•  Neglecting vocabulary and word choice

1. Misinterpreting SubjectVerb Agreement

One of the most common errors students make is overlooking subject verb agreement. This occurs when the subject of a sentence doesn’t agree with the verb in number, leading to grammatical inconsistencies.

Solution: Practice identifying the subject in each sentence and ensuring it matches the verb in number. For example, “The group of students are preparing for the test” should be corrected to “The group of students is preparing for the test” . Familiarize yourself with common patterns to help avoid these mistakes.

2. Ignoring Verb Tense Consistency

The Digital SAT often includes questions that test your ability to maintain consistent verb tenses. Switching tenses within a sentence or paragraph can confuse readers and disrupt the sentence's flow.

Solution: Keep an eye on the main tense used in each passage or sentence and make sure all verbs align with that tense. For instance, if a sentence starts in the past tense, maintain the past tense unless there’s a clear shift in time. Practicing with sample questions can improve your sense of tense consistency.

3. Misusing Punctuation Marks

Punctuation plays a crucial role in clarifying meaning, but many students misuse commas, semicolons, and apostrophes. Incorrect punctuation can change the meaning of a sentence or make it hard to understand.

Solution: Familiarize yourself with the most common punctuation rules:

•  Use commas to separate elements in a list or to offset nonessential information.
  
  
•  Semicolons can link related independent clauses, while apostrophes show possession or form contractions.
  
  
•  Avoid comma splices (joining two complete sentences with only a comma).

• By practicing these rules, you can confidently handle punctuation questions on the SAT.

4. Confusing Pronoun References

Pronouns should clearly refer to a specific noun in a sentence. Ambiguity in pronoun reference can confuse the reader and result in grammatical errors.

Solution: Identify the noun each pronoun refers to in a sentence. For example, “When Sarah met Emily, she was excited” could be ambiguous. Instead, “Sarah was excited when she met Emily” clarifies the pronoun reference. Practicing with ambiguous sentences can help you spot and correct unclear pronouns.

5. Overlooking Parallel Structure

Parallel structure means using consistent grammatical forms within a sentence. This includes matching verb forms or creating balanced lists, which many students overlook.

Solution: When listing items or connecting clauses, ensure that all elements have the same structure. For example, “She enjoys reading, swimming, and to jog” is incorrect due to the inconsistency. Correcting it to “She enjoys reading, swimming, and jogging” maintains a parallel structure, improving readability.

6. Misplacing Modifiers

Misplaced modifiers can create confusing or unintentionally humorous sentences by describing the wrong part of the sentence. This is a common error on the Digital SAT.

Solution: Place modifiers as close as possible to the word they modify. For instance, “Running through the park, the flowers looked beautiful” implies that the flowers are running. Revising to “Running through the park, I found the flowers beautiful” provides clarity. Practice placing modifiers correctly to avoid these pitfalls.

7. Failing to Recognize Idiomatic Expressions

The SAT often tests your knowledge of idiomatic expressions, which are phrases that follow specific preposition or verb pairings. Misusing idioms can make your response sound awkward or incorrect.

Solution: Familiarize yourself with common idiomatic expressions. For example, the phrase “interested in” is idiomatic, while “interested on” is incorrect. Make a list of common expressions and their correct forms to help you identify these during the test.

8. Ignoring Sentence Structure Errors

Before choosing punctuation, determine whether the words on each side form complete independent clauses.

Solution: Learn to spot and correct sentence fragments (incomplete thoughts) and runons (two thoughts joined incorrectly). For example, “She went to the store, she bought milk” is a runon. Correct it to “She went to the store, and she bought milk” or separate it into two sentences. Practicing sentence restructuring can help you avoid these errors.

9. Misplacing or Misunderstanding Sentence Boundaries

Focus on:

• fragments
• run-ons
• comma splices
• independent vs. dependent clauses

10. Choosing Answers by What Sounds Right

Students sometimes choose an answer because it sounds natural in conversation rather than because it follows Standard English conventions.

Solution: Read the entire sentence and identify the grammar rule being tested before selecting an answer.

Conclusion

Mastering the Digital SAT Reading and Writing section includes a Standard English Conventions domain that tests sentence structure, usage, punctuation, sentence structure, and vocabulary. By learning to avoid common mistakes like misinterpreting subject verb agreement, misusing punctuation, and confusing pronouns, you can improve your performance and approach the test with confidence.

EdisonOS Tip: For a structured grammar review, try using EdisonOS. This platform provides targeted resources to help you practice grammar rules, sentence structure, and punctuation. EdisonOS is designed to support students preparing for the SAT with tools that enhance accuracy and efficiency.

Try out free digital sat practice test.

By sharpening your grammar skills with these tips and leveraging resources like Edison OS, you’ll be well prepared to tackle the SAT Grammar section with clarity and precision.

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