Having read thousands of student essays, English teachers often find the same few mistakes. Students in grades 6-12 should write 5-paragraph essays with fluency. Here are some of the most common errors.
A thesis that doesn’t answer the prompt
The thesis is the roadmap for your entire essay. If it’s vague or doesn’t actually answer the question, the rest of your paper is built on a weak foundation. For example, imagine the prompt asks:
How does the author use symbolism to develop the theme?
A weak thesis might say:
“The author uses symbolism throughout the story.”
That’s true, but it doesn’t answer the prompt. It doesn’t identify the theme or explain how symbolism develops it.
A stronger thesis would say:
“The author uses the recurring image of the river to symbolize personal growth, showing that overcoming fear is necessary for maturity.”
Notice the difference? The stronger thesis makes a clear claim that the rest of the essay can support.
Teacher Tip: Before you start writing, ask yourself: Does my thesis actually answer every part of the prompt?
Paragraphs that wander off topic
One of the fastest ways to lose points is to include information that doesn’t support your argument. Each paragraph should focus on ONE idea that supports your thesis. If you start talking about other characters, events, or topics, your writing becomes confusing.
A helpful trick is to read the first sentence of each body paragraph. Each topic sentence should introduce one point or concept that supports your thesis. Make sure the paragraph stays on point and only discusses that idea.
Teacher Tip: At the end of every paragraph, ask yourself: How does this prove my thesis? If you can’t answer that question, revise.
Quotes dropped in without explanation
This is probably the most common mistake I see.
Students often believe that including a quotation is enough. It isn’t.
Consider these two examples:
❌ Weak
Atticus says, “You never really understand a person until you consider things from his point of view.”
The quotation is accurate, but then the paragraph moves on. The reader is left wondering, So what?
✅ Stronger
Atticus says, “You never really understand a person until you consider things from his point of view.” This advice demonstrates one of the novel’s central themes: empathy. By encouraging Scout to see the world through another person’s eyes, Lee shows that understanding others is essential for justice and compassion.
The quotation is only the beginning. Your explanation is where your analysis—and your grade—comes from.
Teacher Tip: Try to write at least two or three sentences explaining every quotation you use.
Repeating the same idea over and over
Students sometimes think repeating themselves will make their essay stronger. It won’t! Repeating yourself makes your essay sound underdeveloped and repetitive.
For example:
The character is brave.
She shows courage throughout the story.
She is fearless.
Those sentences all communicate essentially the same idea.
Instead, develop your argument by adding new insights.
Ask questions like:
- Why is the character brave?
- What causes this change?
- How does this affect the plot?
- What does the author want readers to understand?
Each paragraph should deepen your analysis rather than restate it.
Teacher Tip: Every new paragraph should teach the reader something they didn’t already know.
Careless grammar and punctuation errors
The writing process includes 5 steps: Plan, write, revise, edit, and publish. Writing is only the second step!
When you feel you are done with an essay, your first read-over should be done with the intention of revising. Add concrete details and reasonable explanations. Make sure you are proving your thesis and not making any other mistakes detailed in this post.
When you’re satisfied with what you have written, it’s time to edit! Read through the essay with a fine-toothed comb, looking for spelling, grammar, and punctuation errors. You aren’t ready to publish until you have completed all of these steps!
Reading your essay aloud is one of the best editing strategies. Your ears often catch mistakes your eyes skip over.
Another helpful strategy is to take a short break before revising. Coming back with fresh eyes makes it much easier to notice awkward wording and grammar mistakes.
Teacher Tip: Never submit an essay immediately after finishing it. Even 10–15 minutes of revision can significantly improve your final draft.
Final thoughts
Strong writing isn’t about using big words or writing the longest essay in the class. It’s about communicating your ideas clearly, supporting them with thoughtful evidence, and taking the time to revise your work.
The good news? Every mistake on this list is fixable. With practice and feedback, you’ll begin to spot these issues before your teacher ever sees your paper.
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