Common Mistakes in IELTS Essay Writing and How to Avoid Them

Why Task 2 Errors Are So Costly

IELTS Writing Task 2 is worth double the marks of Task 1. That single fact changes everything about how you should approach it. A weak essay does not just pull down your Writing band — because your overall band score is the mean of all four skills, a low Writing score drags your final number down harder than most candidates realise.

The four marking criteria for Task 2 are Task Response, Coherence & Cohesion, Lexical Resource, and Grammatical Range & Accuracy — each weighted equally at 25%. So a beautiful vocabulary score cannot rescue a structurally incoherent essay. You need all four cylinders firing.

Below I break down the mistakes I see most consistently in Task 2 — not as a vague list, but with the why behind each one, so you can actually fix them.

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Mistake 1 — Misreading the Question and Drifting Off-Topic

This is the single most damaging error, and it feeds directly into Task Response — the criterion that asks: did you actually answer what was asked?

IELTS Task 2 questions come in several distinct types: opinion essays ("To what extent do you agree or disagree?"), discussion essays ("Discuss both views and give your opinion"), problem-solution essays, and advantage-disadvantage essays. Each demands a different structure. Treating a discussion essay as a pure opinion essay — or ignoring the instruction to give your opinion — will cap your Task Response score at Band 5, no matter how fluent your English is.

The fix is deceptively simple: underline the task instruction verb and the topic focus before you write a single word. Then check your thesis sentence directly answers both.

The essay question asks: "Some people believe that governments should fund arts programmes. Others think this money should go to public services. Discuss both views and give your own opinion." A strong thesis: "While arts funding enriches cultural life, I believe essential public services should take priority in government budgets."

Notice that this thesis does three things: acknowledges both sides, signals the essay structure, and commits to a clear position. That is Task Response in one sentence.

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Mistake 2 — A Thesis Statement That Says Nothing

Related to the above but distinct: many candidates write an introduction that paraphrases the question and then adds a non-committal closer like "This essay will discuss the advantages and disadvantages." That is not a thesis — it is a table of contents, and it scores poorly on Task Response because the examiner cannot see your position.

A thesis must commit. You do not need to be extreme, but you must be clear. Examiners are trained to reward a well-supported argument, not a safe, opinion-free summary.

Weak thesis: "There are many arguments both for and against the use of social media by young people."

Strong thesis: "Although social media offers young people genuine opportunities for connection and learning, the risks to mental health outweigh these benefits and warrant tighter parental controls."

The second version tells the examiner exactly where the essay is going. That clarity earns marks from the very first paragraph.

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Mistake 3 — Underdeveloped Body Paragraphs

A common pattern: candidates state a point, add one thin example, and move on. Two body paragraphs of four sentences each will not get you to Band 7. Examiners want to see extended and supported ideas — that phrase appears verbatim in the Band 7 Task Response descriptor.

The most reliable paragraph structure is Point → Explanation → Example → Link back. The explanation step is where most marks are lost. Saying "Social media is harmful" is a point. Explaining why — because constant comparison with curated content triggers anxiety in developing adolescents — is development. That is what separates a Band 6 paragraph from a Band 7 one.

Aim for roughly 90–120 words per body paragraph. That gives you enough room to develop without padding.

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Mistake 4 — Overusing Transition Words as a Crutch

Coherence & Cohesion does not mean starting every sentence with Furthermore, Moreover, or In addition. That is one of the most widespread misconceptions I see, and it actively hurts your score. The Band 7 descriptor for Cohesion specifically warns against "mechanical" use of cohesive devices.

True cohesion is about logical flow — the reader should be able to follow your argument without needing a signpost on every sentence. Use pronouns, synonyms, and sentence structure to link ideas, not just connectors.

Mechanical (penalised): "Social media is popular. Furthermore, it is used by many people. Moreover, young people use it every day. In addition, it affects mental health."

Coherent: "Social media has become embedded in daily life, particularly among younger generations — and this ubiquity is precisely what makes its psychological effects so difficult to ignore."

The second version uses a dash and a pronoun (this ubiquity) to connect ideas. It reads like a real argument, not a list.

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Mistake 5 — Vocabulary That Looks Advanced but Isn't Accurate

Lexical Resource rewards precision and range, not just complexity. A very common error is reaching for an impressive-sounding word without checking its meaning or collocation. This often produces sentences that are technically grammatical but semantically odd — and examiners notice immediately.

For example, "mitigate" does not collocate with "problems" the way candidates think. You mitigate risks or effects, not problems directly. Similarly, "detrimental" is almost always followed by "to", not "for".

Incorrect collocation: "The government should mitigate the problems of unemployment."

Correct collocation: "The government should implement policies to mitigate the effects of unemployment."

The practical fix: when you learn a new word for essay writing, learn it in a phrase, not in isolation. Learn "pose a significant threat to", not just "threat".

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Mistake 6 — Grammatical Errors That Repeat Across the Essay

Grammatical Range & Accuracy penalises frequent errors more than occasional ones. One slip in a complex sentence is forgivable. The same subject-verb agreement mistake appearing six times signals a systematic gap — and that caps your grammar score.

The most common recurring errors in Task 2:

• Subject-verb agreement with uncountable nouns — "The information are..." should be "The information is..."
• Article misuse — omitting the before a previously mentioned noun, or adding a before an uncountable noun
• Tense inconsistency — switching between present and past when discussing a general truth
• Run-on sentences — joining two independent clauses with only a comma

The most efficient way to address this is to proofread for one error type at a time in the last two minutes. Scan only for article errors, then scan only for verb agreement. You will catch far more than a general re-read.

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Mistake 7 — Ignoring the Word Count (in Both Directions)

The minimum for Task 2 is 250 words. Writing below this is penalised explicitly under Task Response. But writing 450 words in 40 minutes almost always means less time for planning and proofreading — and a longer essay is not a better essay if the extra content is repetitive or irrelevant.

A realistic, well-structured Task 2 essay sits between 270 and 320 words. That is enough to develop two strong body paragraphs with an introduction and conclusion, without sacrificing quality for quantity.

Time allocation matters here: spend 5 minutes planning, 30 minutes writing, and 5 minutes checking. The planning step is not optional — it is what stops you from writing three sentences and realising you have argued yourself into a corner.

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Mistake 8 — A Conclusion That Just Repeats the Introduction

A conclusion that paraphrases the introduction word-for-word adds nothing and signals to the examiner that you ran out of ideas. A strong conclusion does two things: restates your position in fresh language and signals finality without introducing a brand-new argument.

Weak conclusion: "In conclusion, there are advantages and disadvantages to social media and governments should consider both sides."

Strong conclusion: "Ultimately, while the connective power of social media is undeniable, the evidence points clearly to a need for structured guidance — particularly for younger users — to ensure the technology serves wellbeing rather than undermining it."

The second version echoes the thesis, uses different vocabulary, and closes the argument decisively.

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Putting It All Together

Every mistake above maps directly to one of the four marking criteria. That is not a coincidence — it is the design of the test. When you understand why each error costs marks, fixing it becomes a targeted decision rather than a guess.

If I had to prioritise: get your Task Response right first. A clear, committed thesis and fully developed paragraphs that actually answer the question will do more for your band score than any vocabulary list. Everything else — cohesion, grammar, lexis — sits on top of a solid argumentative foundation.