IELTS Writing Task 1 Grammar Errors Checker: Band Score Guide

Here's the thing nobody mentions: one grammar mistake won't sink you. But five of them? You're looking at Band 6 instead of Band 7—maybe worse. The band descriptors for Grammatical Range & Accuracy are brutal. They don't just measure whether you're correct; they measure how consistently correct you are across 150 words.

This guide shows you exactly which grammar mistakes cost points, how examiners spot them, and how to catch them before you hit submit. Whether you're using a free IELTS writing checker or reviewing manually, understanding these patterns will transform your accuracy.

Why Grammar Matters More in Task 1 Than You Think

Task 1 is short. You need a minimum of 150 words. That density works against you. Write 200 words with 4 errors, and that's a 2% error rate. Doesn't sound bad, right? But examiners see it as sloppy work. When you've got fewer sentences to show range, every single one has to count.

Here's the split: the band descriptors grade grammar on two fronts. Range—can you use complex structures? And accuracy—can you use them correctly? You can't just write simple sentences perfectly and expect a Band 7. You need complex sentences that work.

The 5 Grammar Mistakes That Destroy Your Band Score

These five errors show up constantly in Band 5 and Band 6 work. Fixing them positions you to compete for Band 7 immediately.

1. Subject-Verb Agreement Errors

This is the killer. Nearly every piece of Task 1 feedback I give includes this issue.

"The number" is singular. You need "has," not "have." Students trip up because they focus on "visitors" and treat the whole thing as plural. Wrong move. The subject is "number." Same trap with "a series of events," "a majority of people," and "a group of teenagers." All singular verbs.

2. Tense Consistency Within Sentences

Task 1 describes data, trends, or processes. Most of it lives in simple past. But students slip into present tense mid-sentence or flip between past and present without reason.

You're describing past data. Stay in past tense unless you're explicitly talking about something that's still true now. Most students switch tenses unconsciously because they're thinking about today while they write.

3. Article Errors (A, An, The, Or Nothing)

Non-native speakers either throw articles everywhere or forget them entirely. Examiners notice immediately, and IELTS writing checkers flag these consistently.

"Consumption" is uncountable. No article needed. Many students add "the" reflexively. Watch these words: consumption, production, employment, education, growth, decline, increase. When used generally, they don't take articles.

4. Incorrect Comparative and Superlative Forms

Task 1 demands comparisons. You'll compare years, groups, trends. Mess this up and you sound careless.

Don't double up markers. It's either "higher" or "more high"—pick one. Also watch "different from" versus "different to" (both work in IELTS, but skip "different than" if you want formal register). Same goes for "compare to" versus "compare with." Both are fine, just stay consistent.

5. Dangling or Misplaced Modifiers

These confuse the reader. Examiners deduct points for unclear writing.

The participle "rising" must modify the subject. In the weak version, it dangles awkwardly. Restructure so the link is clear.

How to Spot Grammar Errors Before Submission

You won't have time to consult a grammar reference during the exam. You need a fast system. Here's what works in real time.

Step 1: Read Your Essay Backwards

Start from the last sentence and work backward. This kills the flow of meaning, forcing your brain to focus on grammar instead of content. You'll catch subject-verb mismatches and tense shifts faster because you're not caught up in the argument.

Step 2: Circle Every Verb

Go through and mark each verb. Check the tense. Does it fit the surrounding context? Any unexplained shifts? This takes 30 seconds and catches roughly 60% of grammar problems.

Step 3: Check Articles on Countable and Uncountable Nouns

If articles trip you up (and they do for most non-native speakers), scan just for these. Ask yourself: countable or uncountable? If it's countable and singular, does it have "a," "an," or "the"? If uncountable, should it have an article? Low-hanging fruit for a quick win.

Common Task 1 Sentence Patterns and How to Execute Them

Most Task 1 essays follow predictable patterns. Master these, and you'll sidestep 80% of grammar mistakes.

Pattern 1: The Overview Sentence

You usually open by summarizing the whole graphic in one or two sentences.

Simple. One independent clause. Easy to nail. Stick with this for your overview.

Pattern 2: The Comparison Sentence

Task 1 requires comparisons. Use parallel structure and consistent tenses.

Both clauses use past tense (increased, declined). Both have a clear subject and verb. This is Band 7 work. Compare to: "Product A increased 25%, but Product B was going down 15%." Tenses flip, and the tone shifts informal. That's Band 5 or 6.

Pattern 3: The Trend Sentence

You'll describe movement or change. Use consistent language and clear logic if you're implying cause-effect.

Alternative: "Employment levels peaked in 2015 and then declined steadily for three years." Both work. The key is clarity and tense agreement. Don't mix "peaked" with "was falling" or "has fallen."

How Grammar Errors Impact Your Band Score

IELTS grades Task 1 on four criteria: Task Response, Coherence & Cohesion, Lexical Resource, and Grammatical Range & Accuracy. That last criterion is 25% of your score. A single band point often comes down to grammar accuracy.

Here's how the band descriptors break down for grammar:

• Band 9: Uses a wide range of structures with full flexibility and accuracy; rare errors are due to ambition
• Band 8: Uses a variety of complex structures but these are not always controlled; errors in grammar may occur, but rarely obscure meaning
• Band 7: Uses a variety of complex structures with generally accurate grammar; occasional errors or inappropriateness do not impede communication
• Band 6: Uses a variety of structures, but these are not always accurate; errors in grammar may be frequent and cause some difficulty for the reader
• Band 5: Uses only a limited range of structures and these usually contain errors; errors of grammar are frequent and may obscure meaning

Look at the gap between Band 7 and Band 6. Band 7 errors are "occasional" and don't block communication. Band 6 errors are "frequent" and create "some difficulty." That's massive. One or two fewer common grammar mistakes can push you from Band 6 to Band 7.

Quick Grammar Checklist for Task 1

Use this in your final 30 seconds of review. Print it out or memorize it.

• Did I stay in past tense throughout? (Unless describing a general truth)
• Does every verb match its subject? (Watch "number of," "series of," "group of")
• Did I use articles correctly on countable and uncountable nouns?
• Are my comparatives and superlatives formed correctly? (No "more higher")
• Do my modifying phrases attach to the right subject?
• Is my structure parallel when I'm comparing or listing?

Why Generic Grammar Tools Miss IELTS-Specific Errors

Grammarly and similar tools catch obvious mistakes: missing subjects, wrong tense markers. But they miss context-dependent errors that IELTS examiners catch instantly. "The number of students have" sounds wrong, but a basic grammar checker might miss it in a long sentence. An IELTS examiner deducts points immediately.

Article errors are another blind spot. "The consumption" might pass a standard grammar tool, but it fails IELTS writing standards. You need feedback from someone trained in band descriptors, not just general English rules.

An IELTS writing checker designed specifically for band scoring will identify more common grammar mistakes than a generic tool. It understands what examiners actually penalize and why grammar errors cost band points.