Common Grammar Mistakes Students Make in Essays and How to Fix Them

Recent Trends in Student Writing

In recent years, educators and writing tutors have noted a shift in the types of grammar errors appearing in student essays. While classic mistakes such as subject-verb disagreement persist, the widespread use of voice-to-text and autocorrect features has introduced new patterns, including homophone confusion (e.g., “their” vs. “there”) and missing punctuation in dictated passages. At the same time, the growing reliance on grammar-checking software has sometimes led students to overlook stylistic issues like sentence fragments that pass algorithmic checks but weaken academic tone.

Background: Common Errors and Their Roots

Several grammatical issues recur across student essays at both high school and college levels. These errors often stem from informal speech habits, rushed editing, or incomplete understanding of formal writing conventions. Below are typical mistakes and straightforward fixes.

Frequent Grammar Mistakes

• Subject-verb agreement errors – e.g., “The group of students are attending” should be “is attending.” Fix: Identify the true subject (group) and ignore intervening phrases.
• Comma splices – e.g., “The experiment failed, the results were inconclusive.” Fix: Replace the comma with a period, semicolon, or add a conjunction (“because” or “so”).
• Misplaced or dangling modifiers – e.g., “Walking to class, the rain started.” Fix: Clarify who is walking – “Walking to class, I felt the rain start.”
• Inconsistent verb tense – e.g., shifting from past to present within a paragraph. Fix: Choose a dominant tense (usually past for narratives) and change only for a clear reason.
• Pronoun agreement errors – e.g., “Every student must submit their paper” is now widely accepted; but more formal texts prefer “his or her” or rephrasing. Fix: Use plural antecedents or rephrase to avoid gender-specific pronouns.

User Concerns: Beyond Grades

Students frequently worry that grammar mistakes will lower their grades or make them appear less competent, even when their ideas are strong. However, research suggests that faculty often distinguish between surface-level errors and deeper argument quality. A more pressing concern is the impact on clarity: a sentence that is technically grammatically correct but unclear can confuse readers just as much as a blatant error. Many students also report anxiety about over-reliance on editing tools, fearing they will not learn proper grammar on their own.

Likely Impact on Writing Quality

When students actively correct common grammar mistakes, their essays become easier to follow and more persuasive. Improved grammar can also boost confidence, encouraging students to tackle more complex sentence structures. Conversely, ignoring recurring errors may reinforce bad habits that persist into professional writing. The most significant impact is often seen in timed exams or applications where real-time editing is limited – here, internalized grammar rules matter more than external tools.

What to Watch Next

Several developments are likely to shape how students approach grammar editing in the near future:

• AI-assisted editing in learning platforms – More universities are integrating grammar feedback directly into assignment submission tools, shifting the focus from catching errors to understanding why they occur.
• Adaptive grammar tutorials – New software can target a student’s specific error patterns, offering practice exercises tailored to their weak points.
• Evolving style guides – Traditional rules (like the prohibition of singular “they”) are being updated, potentially reducing common student mistakes as style guides become more inclusive.
• Blended feedback models – Combining peer review with automated grammar checks may help students see errors in context and retain corrections over the long term.

As these trends develop, the goal remains the same: helping students produce clear, polished essays without losing their authentic voice.