IELTS Writing Task 1 Grammar Errors Checker: Jump from Band 7 to Band 8

Here's the thing: you can nail your content, structure, and vocabulary, but one grammar mistake repeated three times will keep you stuck at Band 7. The difference between Band 7 and Band 8 in IELTS writing isn't massive. It's surgical. And it all lives in the grammar.

The IELTS band descriptors for Grammatical Range & Accuracy make this clear. Band 7 allows "occasional errors that do not impede communication." Band 8 demands "consistent use of a wide range of structures with full accuracy and flexibility." That word—consistent—changes everything. You can't have "occasional" mistakes anymore. You need zero patterns of error.

Here's what actually happens: most students at Band 7 aren't failing because they don't know grammar. They're failing because they don't spot their own mistakes. You write quickly under pressure, your brain autocorrects what you meant to write, and you miss it. Then an examiner reads it and marks you down.

This guide shows you exactly which grammar errors are keeping you at Band 7, how to spot them yourself, and how to fix them before the examiner sees them. Whether you're using an IELTS essay checker or self-editing, these seven categories will transform your writing accuracy.

What Examiners Actually Mark: The Band 7 to Band 8 Grammar Gap

You need to understand what the examiner is looking for. The IELTS writing task 1 band descriptors don't just count errors; they look for range and accuracy together. That means Band 8 isn't about writing shorter, safer sentences. It's about writing complex sentences with zero mistakes.

Here are the grammar categories examiners check most ruthlessly:

• Subject-verb agreement (even in complex clauses)
• Tense consistency within a single paragraph
• Article use (a, an, the, or nothing)
• Preposition accuracy
• Sentence structure and fragments
• Parallelism in lists and comparisons
• Pronoun reference clarity

Notice something? These aren't advanced grammar concepts. They're the fundamentals, applied consistently. Band 7 students often make these errors because they're writing fast and assuming the reader will understand intent. Band 8 students slow down and assume nothing.

Subject-Verb Agreement: Where Band 7 Collapses

This error is almost invisible until you look for it.

The subject is "range" (singular). The verb is "have" (plural). Quick fix: "The range... has increased." But why do so many Band 7 writers miss this? Because they're thinking about "products" (which is plural) and their brain defaults to the plural verb.

Here's your strategy: after you write a sentence with a prepositional phrase between the subject and verb, go back and cross out the phrase mentally. Read only the subject and verb. Does it sound right? Do this for every sentence. You'll catch 70% of your agreement errors.

When you have "neither...nor" or "either...or," the verb agrees with the closest subject. Here, "employees" is closest, so it should be "were." This sounds weird to your ear, but it's the rule.

Tense Shifts: The Band 7 Killer

Task 1 typically asks you to describe a graph, chart, or process. Your default tense should be present simple (for static images) or past simple (for time-series data). But here's where students slip: they write one sentence in present, the next in past, then jump to present perfect. It's chaos.

Do you see the tense dance? "Shows" (present), "were" (past simple), "had risen" (past perfect), "representing" (gerund, which doesn't fix the tense issue). This is confusing to read and marks you as Band 7 at best.

Now you're consistent. Once you commit to describing the data as a historical event (past simple), stay there. Don't slip back to present just because you're not thinking.

Articles: The Silent Band 7 Trap

You know the three articles: a, an, the. But the rules? They're deceptively complex. This is where even fluent non-native speakers stumble.

In the second sentence, you need an article before "Trend" because you're talking about the specific trend mentioned in the previous sentence. It should be "The trend shows..." Without it, the sentence feels incomplete.

Here's the rule that matters most for formal letter grammar and Task 1: use "the" when you're referring to specific data shown in the image. Use "a" when you're introducing a general category. After you introduce something with "a," switch to "the" when you reference it again.

Preposition Errors: Why Your Sentences Sound Off

You write a sentence. It feels right. An examiner reads it and thinks, "Close, but not quite Band 8." Often it's a preposition problem.

"Divided in" is incorrect. You divide something into parts. "Divided into four categories" is correct.

Here are the prepositions that trip up Task 1 writers most often:

• Increase by 10% (not "increase to 10%" unless you mean the new total)
• Divided into (not "divided in")
• Account for 30% (not "account of")
• Compared to/with (both work, but be consistent)
• A rise in sales (not "a rise of sales")

The best strategy: after you finish writing, search for any sentence with a preposition and read it aloud slowly. Does it sound natural? If you're not sure, rewrite the sentence to avoid the preposition altogether.

Sentence Fragments and Run-Ons: Structure Mistakes That Scream Band 7

You're writing fast. Your comma key is overworked. You either chop your ideas into fragments or glue them together with commas until they collapse.

That second sentence is technically a run-on. You have a comma splice, connecting two independent clauses with a comma instead of a period or semicolon.

Or even cleaner: "The pie chart shows market share. Three major competitors control 60% of the market. Apple leads with 25%, Samsung with 20%, and Microsoft with 15%."

Parallelism: The Overlooked Grammar Gem

You list three things. You describe three trends. You compare three data points. Are they all in the same grammatical form? Band 7 writers often miss this.

See the mismatch? You have a noun phrase ("a decrease"), another noun phrase ("improved quality"), and then a full clause ("the workforce became more engaged"). It's grammatically jarring.

Now all three items are noun phrases. They're parallel.

Again, inconsistency. "Rose," "increased," "declined" are all verbs, but the structure isn't parallel. The first two use simple past, but you're repeating the subject differently.

Or even better: "Sales rose in Europe and Asia but declined in Africa."

How to Use a Grammar Checker for Band 8 Writing

An IELTS writing checker can help, but you can't rely on spell-check alone. You won't have a tool in the exam room, so the real goal is building your own eye for error. Here's how to use grammar evaluation tools effectively: write your essay first, read it yourself, mark sentences you're unsure about, then check those specific sentences with a tool like our free IELTS essay checker. It's built specifically for Task 1 and catches the grammar evaluation errors that matter most for band scores. Focus on tense consistency, subject-verb agreement, article use, and preposition choices. These separate Band 7 from Band 8.

Your Pre-Submission Checklist: The Band 8 Mindset

You've written your essay. You have 3 minutes left. Use this checklist instead of panicking.

• Read the first sentence of each paragraph aloud. Does the grammar feel solid?
• Circle every verb. Are all verbs the same tense, or do you have a justified reason for switching?
• Check every sentence over 20 words. Is it one sentence or two?
• Find every list (three or more items). Are they parallel?
• Look for sentences that start with a preposition or a dependent clause. Does the main clause have both a subject and verb?

This takes 90 seconds. It catches 80% of the grammar errors that keep you at Band 7.

Beyond grammar, make sure your overview paragraph hits all the key trends in your data. Grammar gets you from Band 7 to Band 8, but a weak overview will hold you back from the start. If you're writing a formal letter for Task 1, pay special attention to formal letter grammar mistakes and register consistency.