Mistake 1: Subject-Verb Agreement in Complex Clauses
Examiners consistently report that subject-verb agreement errors inside long modifying phrases are the most common reason academically strong candidates fail to reach Band 7 in Grammatical Range and Accuracy. These mistakes survive even when students know the basic rule, because the true subject gets buried under prepositional phrases or relative clauses that pull attention away during drafting.
Band 6 vs Band 9 Comparison
Band 6 Student Sentence: The list of required documents for the visa application were submitted late.
Band 9 Correction: The list of required documents for the visa application was submitted late.
The Core Grammar Rule
The verb must agree with the head noun "list," not the nearest noun "application" or "documents." When you write academic prose, mentally cross out the prepositional phrases first. That isolates the true subject before you choose your verb form.
Practice Step: Find the head noun in "The analysis of demographic trends reveal significant shifts" and rewrite it with correct agreement.
Mistake 2: Article Misuse with Abstract and Uncountable Nouns
Article errors do real damage. They occur often, and they signal a fundamental gap in English proficiency to a native-speaker examiner. In fact, analysis of thousands of AI-scored essays shows that students who fix article misuse and preposition errors see an average 0.5 band increase in Grammatical Range and Accuracy within two weeks of targeted practice.
Band 6 vs Band 9 Comparison
Band 6 Student Sentence: The technology has transformed the education in recent decades.
Band 9 Correction: Technology has transformed education in recent decades.
The Core Grammar Rule
Don't use the definite article "the" when you're talking about abstract concepts or uncountable nouns in a general sense. Save "the" for specific references, where both you and the reader know exactly which instance of the noun is meant.
Practice Step: Correct the article usage in "The pollution is a major problem for the society" so it reflects general, conceptual usage.
Mistake 3: Run-On Sentences and Comma Splices
Run-on sentences are perhaps the single most common structural failure in IELTS Writing Task 2 responses. A comma alone cannot join two independent clauses. It lacks the grammatical strength to hold two complete thoughts together, and the result is a fused sentence that confuses the reader.
Fix Run-On Sentences IELTS Style
Three methods fix this while preserving your meaning and showing grammatical control. Use a semicolon to link closely related ideas. Use a subordinating conjunction to show the logical relationship between them. Or simply separate the clauses into two distinct sentences.
Band 6 vs Band 9 Comparison
Band 6 Student Sentence: The government should invest in education, it will reduce poverty.
Band 9 Correction: Because government investment in education fosters economic mobility, such spending directly reduces poverty rates.
The Core Grammar Rule
Never rely on a comma alone to connect independent clauses, unless it's paired with a coordinating conjunction like "and," "but," or "so." Subordinating one clause is exactly the kind of complex structure examiners expect at Band 7 and above.
Practice Step: Turn "Remote work increases flexibility, employees prefer it" into a single complex sentence using subordination.
Mistake 4: Inconsistent Verb Tense in Task 1 and Task 2
Shifting between past and present tense without logical reason breaks coherence and signals weak grammatical control at the same time. Your tense choice should stay consistent throughout each paragraph, unless the timeline of events genuinely demands a shift.
Band 6 vs Band 9 Comparison
Band 6 Student Sentence: The chart shows that unemployment increased in 2020, but it decreases significantly by 2022.
Band 9 Correction: The chart shows that unemployment increased in 2020 but decreased significantly by 2022.
The Core Grammar Rule
Use past tense for completed historical periods in Task 1, and present tense for general arguments in Task 2. Set your timeframe in the opening sentence and stick to it, unless you're describing a clear chronological progression.
Practice Step: Audit a practice paragraph to check that every verb matches the timeframe you established.
Mistake 5: Faulty Parallel Structure in Lists and Comparisons
Parallel structure is a marker of advanced grammatical range, not just a stylistic nicety, because it shows conscious control over syntax. Mixing gerunds, infinitives, and noun phrases in a single list creates a jarring asymmetry that lowers your accuracy score immediately.
Band 6 vs Band 9 Comparison
Band 6 Student Sentence: Universities should focus on improving facilities, to hire better faculty, and research funding.
Band 9 Correction: Universities should focus on improving facilities, hiring better faculty, and securing research funding.
The Core Grammar Rule
Every item in a series needs the same grammatical form. Start with a gerund, continue with gerunds; start with a noun phrase, keep that pattern for the whole list.
Practice Step: Align the items in "She enjoys reading, to swim, and hiking" into consistent parallel form.
Mistake 6: Preposition Errors in Academic Collocations
Prepositions are deceptively hard because they rarely translate directly between languages. You more or less have to learn them as fixed chunks. Using "impact to" instead of "impact on," or "dependent of" instead of "dependent on," gives away non-native proficiency instantly, regardless of how good the surrounding vocabulary is.
Band 6 vs Band 9 Comparison
Band 6 Student Sentence: This policy will have a negative impact to the economy.
Band 9 Correction: This policy will have a negative impact on the economy.
The Core Grammar Rule
Academic collocations are indivisible units. Change them and they sound unnatural. Our academic collocations and vocabulary guide will help you internalize verified pairings instead of guessing from translation.
