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4.4 Common Grammar Errors and How to Avoid Them

4.4 Common Grammar Errors and How to Avoid Them

Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025
🔤English 9
Unit & Topic Study Guides

Grammar mistakes can trip up even the best writers. From subject-verb agreement to pronoun usage, these errors can muddy your message. But don't worry! With some know-how and practice, you can spot and fix common slip-ups.

Proofreading is your secret weapon against grammar gaffes. By developing a systematic approach and using effective techniques, you'll catch more errors. Remember, even small tweaks can make a big difference in how clearly your writing communicates.

Common Grammar Errors

Subject-verb agreement correction

  • Singular subjects take singular verbs (The dog barks loudly)
  • Plural subjects take plural verbs (The dogs bark loudly)
  • Collective nouns can be singular or plural based on context
    • Singular: The team plays well together as a unit
    • Plural: The team wear different uniforms to distinguish roles
  • Compound subjects joined by "and" usually take a plural verb (John and Mary go to the store together)
  • Intervening phrases do not affect subject-verb agreement (The box of cookies sits on the table untouched)

Pronoun usage and errors

  • Use "who" for subjects and subject complements (Who is attending the party tonight?)
  • Use "whom" for objects of verbs and prepositions (To whom should I address the letter?)
  • Avoid using "they" or "their" for singular antecedents, instead use "he or she" or "his or her"
  • Make sure pronouns agree with their antecedents in number and gender (Every student should bring his or her textbook to class)

Commonly confused words

  • "Their" shows possession (Their house is located down the street)
  • "There" indicates location or acts as a dummy subject
    • Location: We vacationed there last summer
    • Dummy subject: There are many people attending the party
  • "They're" is a contraction of "they are" (They're going to the movies tonight to see the new release)
  • Other commonly confused words:
    • "Its" (possessive) vs. "it's" (contraction of "it is")
    • "Your" (possessive) vs. "you're" (contraction of "you are")
    • "Affect" (verb meaning to influence) vs. "effect" (usually a noun meaning result)
Subject-verb agreement correction, Should You Use –s (or –es) for a Present-Tense Verb? – About Writing: A Guide

Run-on sentences and fragments

  • Run-on sentences contain two or more independent clauses not properly connected
    • Fix by using a period, semicolon, or coordinating conjunction
    • Run-on: I went to the store I bought groceries
    • Corrected: I went to the store. I bought groceries.
  • Sentence fragments are incomplete, lacking a subject, verb, or complete thought
    • Fix by adding missing elements or combining with another sentence
    • Fragment: Because I was tired
    • Corrected: I went to bed early because I was tired

Proofreading and editing strategies

  • Read the text slowly and carefully to catch errors
  • Read the text aloud to identify awkward phrasing or mistakes
  • Use spell-check and grammar-check tools as a supplement, but don't rely on them entirely
  • Check for common errors like subject-verb agreement and pronoun usage
  • Have someone else review your work for additional feedback and a fresh perspective
  • Take breaks between writing and proofreading to approach the text with fresh eyes
  • Create a checklist of your most common errors to refer to during the editing process

Effective Proofreading Techniques

Develop a systematic approach

  • Start with big picture elements and work towards smaller details
    1. Check overall structure and organization first
    2. Focus on paragraph coherence and sentence structure
    3. Look for word-level errors and typos
  • Use proofreading marks or symbols to identify and correct errors efficiently
  • Keep a log of your most frequent mistakes to focus on in future writing
  • Proofread in multiple passes, focusing on one type of error at a time (Check punctuation in one pass, then grammar in another)
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