Grammar Errors That Cap IELTS Writing at Band 6

Many IELTS candidates plateau at Band 6 in Grammatical Range and Accuracy (GRA). They understand English grammar conceptually, write mostly comprehensible sentences, and use some complex structures—yet they cannot break through to Band 7. The problem often lies in specific, recurring error patterns that signal limited grammatical control to examiners.

This diagnostic guide identifies the most common grammar errors that create the Band 6 ceiling, explains why these errors matter, and provides strategies for correction. Recognizing your specific error patterns is the first step toward addressing them.

Understanding the GRA Criterion

The GRA criterion evaluates two elements: range and accuracy.

Range: What Structures Do You Use?

Band 6 range is described as "a mix of simple and complex sentence forms." Band 7 requires "a variety of complex structures." The difference is not just using complex structures but using different types of complex structures effectively.

Accuracy: How Correctly Do You Use Them?

Band 6 accuracy allows "some errors in grammar and punctuation but they rarely reduce communication." Band 7 requires "good control of grammar and punctuation" with "majority of sentences are error-free."

The Band 6 ceiling exists because candidates either lack range (using only simple structures or only one type of complex structure) or lack accuracy (making the same errors repeatedly).

Error Category 1: Article Errors

Article errors (a, an, the, zero article) are among the most frequent in IELTS Writing, particularly for candidates whose first languages do not use articles. These errors rarely prevent comprehension, which is why many candidates underestimate their impact—but frequent article errors signal Band 6 grammar control.

Common Article Patterns

Missing "the" with specific reference:

Wrong: "Government should invest more in education."

Correct: "The government should invest more in education." (specific government being discussed)

Unnecessary "the" with general reference:

Wrong: "The technology has changed the society."

Correct: "Technology has changed society." (general concepts)

Wrong article with uncountable nouns:

Wrong: "Candidates need a knowledge of grammar."

Correct: "Candidates need knowledge of grammar."

Missing article with countable singular nouns:

Wrong: "Education is important for child."

Correct: "Education is important for a child." or "Education is important for children."

Diagnosis Strategy

After writing practice essays, highlight every noun and check: Is it countable or uncountable? If countable, is it singular or plural? If singular countable, does it have an article? Is the reference specific (the) or general (a/an or plural with no article)?

Error Category 2: Subject-Verb Agreement

Subject-verb agreement errors occur when singular subjects take plural verbs or vice versa. These errors are often more noticeable than article errors and can impede communication.

Common Agreement Patterns

Errors with complex subjects:

Wrong: "The effects of technology on education is significant."

Correct: "The effects of technology on education are significant." ("effects" is the subject, not "technology" or "education")

Errors with uncountable nouns:

Wrong: "Information about these topics are available online."

Correct: "Information about these topics is available online." ("information" is uncountable, always singular)

Errors with "there is/are":

Wrong: "There is many reasons for this trend."

Correct: "There are many reasons for this trend."

Errors with collective nouns:

Wrong: "The government have implemented new policies." (in American English)

Correct: "The government has implemented new policies."

Note: British English sometimes treats collective nouns as plural. Either is acceptable in IELTS, but be consistent.

Diagnosis Strategy

For each sentence, identify the main subject and main verb. Ask: Is the subject singular or plural? Does the verb match? Be especially careful when prepositional phrases separate subject and verb.

Error Category 3: Tense Inconsistency

Tense errors often involve unnecessary shifting between past and present or incorrect choice of tense for context. Reviewing writing test sample IELTS responses at higher band levels shows consistent, appropriate tense use throughout.

Common Tense Patterns

Unnecessary tense shifts:

Wrong: "Technology changed how we communicate. It makes information accessible. This created new opportunities."

Correct: "Technology has changed how we communicate. It makes information accessible. This creates new opportunities." (present perspective throughout)

Wrong tense for general statements:

Wrong: "Studies showed that exercise improved mental health." (as a general truth)

Correct: "Studies show that exercise improves mental health." (present for general truths)

Present perfect confusion:

Wrong: "Technology developed rapidly in recent years."

Correct: "Technology has developed rapidly in recent years." (present perfect for recent past with present relevance)

Diagnosis Strategy

Choose a tense perspective for your essay and maintain it unless you have a clear reason to shift. For most Task 2 essays, present tense for general statements and present perfect for recent trends works well. Mark any tense changes and ask: Is this shift necessary and logical?

Error Category 4: Sentence Fragments

Sentence fragments are incomplete sentences punctuated as complete ones. They often result from attempting complex structures without proper control.

Common Fragment Patterns

Dependent clause fragments:

Wrong: "Many students prefer online learning. Because it offers flexibility."

Correct: "Many students prefer online learning because it offers flexibility."

Participle phrase fragments:

Wrong: "Technology has many benefits. Making education more accessible."

Correct: "Technology has many benefits, making education more accessible."

Missing verb fragments:

Wrong: "The main advantage of this approach. That it saves time."

Correct: "The main advantage of this approach is that it saves time."

Diagnosis Strategy

For each sentence, identify the subject and main verb. If either is missing, or if the sentence begins with a subordinating conjunction (because, although, if, when, while) without an independent clause following, you have a fragment.

Error Category 5: Run-on Sentences

Run-on sentences connect independent clauses without proper punctuation or conjunction. They signal weak sentence boundary awareness.

Common Run-on Patterns

Comma splices:

Wrong: "Education is essential, it helps people find employment."

Correct: "Education is essential because it helps people find employment." or "Education is essential; it helps people find employment."

Fused sentences:

Wrong: "Technology changes rapidly companies must adapt quickly."

Correct: "Technology changes rapidly, so companies must adapt quickly."

"However" comma splices:

Wrong: "Many support this view, however, others disagree."

Correct: "Many support this view; however, others disagree." or "Many support this view. However, others disagree."

Diagnosis Strategy

Any time you write a comma between two statements that could each stand alone as sentences, check: Is there a coordinating conjunction (and, but, or, nor, for, yet, so) after the comma? If not, you may have a comma splice.

Error Category 6: Relative Clause Errors

Relative clauses (using who, which, that, whose, where, when) add complexity to writing but are often used incorrectly.

Common Relative Clause Patterns

Wrong relative pronoun:

Wrong: "Students which study hard usually succeed."

Correct: "Students who study hard usually succeed." ("who" for people)

Wrong: "The book who I read was interesting."

Correct: "The book that I read was interesting." ("that" or "which" for things)

Missing relative pronoun where required:

Wrong: "The reason I believe this is important."

Correct: "The reason why I believe this is important." or "The reason that I believe this is important."

Incorrect punctuation of non-restrictive clauses:

Wrong: "Technology which has developed rapidly changes our lives."

Correct: "Technology, which has developed rapidly, changes our lives." (non-restrictive—commas needed)

Diagnosis Strategy

For each relative clause, identify: Is the relative pronoun correct for the noun it refers to? Is the clause restrictive (essential to meaning—no commas) or non-restrictive (additional information—commas needed)?

Error Category 7: Passive Voice Errors

Passive voice adds variety to writing but is frequently formed incorrectly.

Common Passive Patterns

Missing "be" verb:

Wrong: "New policies implemented last year."

Correct: "New policies were implemented last year."

Wrong form of past participle:

Wrong: "The data was collecte from multiple sources."

Correct: "The data was collected from multiple sources."

Overuse creating awkwardness:

Awkward: "It is believed by many people that education is considered to be important."

Better: "Many people believe education is important."

Diagnosis Strategy

Check passive constructions for: correct form of "be" for the tense; correct past participle form; whether active voice would be clearer or more direct.

Error Category 8: Conditional Errors

Conditional sentences express hypothetical situations and their consequences. Errors in conditionals often involve mismatched tenses. Studying writing test samples for IELTS at higher levels shows correct conditional use.

Common Conditional Patterns

Zero conditional (general truths):

Wrong: "If students will study hard, they succeed."

Correct: "If students study hard, they succeed." (present + present)

First conditional (real possibility):

Wrong: "If governments will invest more, education will improve."

Correct: "If governments invest more, education will improve." (present + will)

Second conditional (hypothetical):

Wrong: "If technology did not exist, life will be very different."

Correct: "If technology did not exist, life would be very different." (past + would)

Third conditional (past hypothetical):

Wrong: "If they invested earlier, they will have better results."

Correct: "If they had invested earlier, they would have had better results." (past perfect + would have)

Diagnosis Strategy

Identify what type of conditional you need: general truth (zero), real future possibility (first), present hypothetical (second), or past hypothetical (third). Then match tenses accordingly.

Error Category 9: Preposition Errors

Preposition choice is largely idiomatic and often differs from candidates' first languages, making these errors common.

Common Preposition Patterns

Wrong preposition after verbs:

Wrong: "This leads in better outcomes."

Correct: "This leads to better outcomes."

Wrong preposition after adjectives:

Wrong: "Students are responsible of their own learning."

Correct: "Students are responsible for their own learning."

Wrong preposition with nouns:

Wrong: "The solution of this problem..."

Correct: "The solution to this problem..."

Missing prepositions:

Wrong: "This depends the circumstances."

Correct: "This depends on the circumstances."

Diagnosis Strategy

Keep a log of preposition combinations you use incorrectly. Learn these as fixed phrases rather than trying to apply rules. Common academic collocations worth memorizing include: lead to, result in, depend on, responsible for, solution to, reason for, advantage of.

Building Error Awareness

Step 1: Identify Your Pattern

Write several practice essays. Then, without looking at corrections, categorize your errors:

• Which categories from above appear most frequently?
• Do certain errors appear consistently across essays?
• Are errors concentrated in certain sentence types?

Most candidates have 2-3 dominant error patterns. Identifying these allows focused improvement.

Step 2: Targeted Practice

Once you know your patterns, design practice specifically addressing them. If articles are your weakness, practice exercises focused solely on article choice. If subject-verb agreement causes problems, practice identifying subjects in complex sentences.

Step 3: Editing Protocol

Develop a personal editing checklist based on your error patterns. After writing, review specifically for your known weaknesses. This targeted review is more effective than general proofreading.

Step 4: Track Progress

Monitor whether your targeted practice reduces errors. If an error pattern persists despite practice, you may need to understand the underlying grammar rule more deeply before practice becomes effective.

The Range Component

Fixing errors improves accuracy, but Band 7 also requires grammatical range—using various complex structures. Candidates stuck at Band 6 often rely on one or two complex sentence patterns repeatedly.

Structures for Range

Ensure your writing includes variety from among:

• Simple sentences (for emphasis and clarity)
• Compound sentences (independent clauses joined by and, but, or, so)
• Complex sentences with adverb clauses (because, although, when, if, while)
• Complex sentences with relative clauses (who, which, that)
• Sentences with participial phrases (Starting with..., Having considered...)
• Sentences with noun clauses (that..., what..., whether...)
• Passive constructions where appropriate
• Conditional sentences of various types

Range Check

After writing, identify each sentence type. If more than half are simple sentences, or if complex sentences all use the same pattern (e.g., all begin with "Although..."), work on varying your structures.

Conclusion

The Band 6 ceiling in GRA typically results from specific, recurring error patterns combined with limited structural variety. Breaking through requires identifying your personal error patterns, practicing targeted correction, and expanding the range of structures you use correctly.

Grammar improvement is gradual and requires patience. Focus on one or two error categories at a time rather than trying to fix everything simultaneously. As you review writing test sample IELTS materials, pay attention not just to what high-scoring writers say but to how they construct their sentences.

The candidates who score Band 7+ in GRA are not those who never make errors—they are those whose errors are infrequent and minor, and whose writing demonstrates confident control over various grammatical structures. Building this control takes targeted practice, but the patterns that limit Band 6 writers can be diagnosed and addressed.