Here's the thing: most students stuck at Band 6 in IELTS Writing Task 1 aren't losing points because they can't describe a chart or map. They're losing 1-1.5 bands purely on grammar mistakes.
The difference between Band 6 and Band 7 comes down to one thing: accuracy. Band 7 asks for "generally accurate use of grammar and punctuation" with only occasional errors that don't affect communication. Band 6? That's "frequent errors in grammar and/or punctuation that sometimes obscure meaning." That gap is exactly what this guide helps you close.
You'll see the exact grammar mistakes that cost you Band 7, real Task 1 sentences showing weak vs. strong versions, and a practical checklist you can use in your final 2 minutes of writing. The goal: catch these errors before the examiner does.
Not every grammar error costs you the same. Some barely register. Others drop your band immediately. Let me walk you through the ones that matter most when writing IELTS essays in the Task 1 format.
This is the single most common error examiners see. You're describing a graph or diagram from one moment in time. Everything should stay in the same tense, either all present or all past. When you mix them, you signal Band 6 to any trained examiner.
Weak: "The chart shows that online shopping increased dramatically. In 2020, it rises by 45 percent and continues to grow rapidly."
Good: "The chart shows that online shopping increased dramatically. In 2020, it rose by 45 percent and continued to grow rapidly."
Once you pick past tense for the data, lock it in. No jumping to "rises." That single inconsistency costs you points because it suggests you're not in control of your grammar.
This feels small, but it's visible to every examiner. You write something like "A series of factors contributes" when it should be "contribute," or vice versa. Academic graphs in Task 1 use complex subjects constantly, and you'll slip up if you're not careful.
Weak: "The number of annual visitors to the museum have increased from 3 million to 8 million."
Good: "The number of annual visitors to the museum has increased from 3 million to 8 million."
"Number" is singular. "Have" is plural. That mismatch screams Band 6 to any trained examiner reading your essay.
Here's the blunt truth: prepositions trip up most non-native writers, and IELTS examiners notice immediately. You'll lose marks for using the wrong preposition repeatedly. In Task 1, you're constantly describing relationships: increases in, decreases of, rises by, falls to. Get these wrong and you've signaled Band 6 or lower to the examiner.
Weak: "Sales increased to 50 percent." (This means sales hit exactly 50%, not that they grew by that amount.)
Good: "Sales increased by 50 percent."
Here's another one you'll mess up:
Weak: "A comparison between A with B is shown."
Good: "A comparison between A and B is shown." (Choose one: "between...and" or "comparison of...with," but not both.)
Quick tip: Write three Task 1 graphs this week. After each one, spend 3 minutes doing a preposition audit. Search your draft for "to," "by," "of," "between," "among." Check each one manually. This one habit alone can push you from Band 6 to Band 7.
Articles (a, an, the) feel trivial. They're not. Band 7 means "only occasional errors." Missing articles in Task 1 aren't occasional, they're systematic, and examiners count them.
Academic English has a strict rule: if you're talking about something specific, use "the." If you're introducing something new or speaking generally, use "a" or "an." In Task 1, you're always talking about the specific graph, map, or table in front of you. That means "the" shows up constantly.
Weak: "Chart shows that unemployment fell in period between 2010 and 2015."
Good: "The chart shows that unemployment fell in the period between 2010 and 2015."
When you're describing a category on the graph (like a line representing "Germany"), use "the" to refer to that specific country's line. When you're speaking generally ("some countries grew"), skip the "the."
Weak: "Germany experienced biggest growth, while Japan saw smallest decline."
Good: "Germany experienced the biggest growth, while Japan saw the smallest decline."
Task 1 loves comparisons. You'll write sentences comparing two, three, or four data categories. This is where you'll accidentally mix singular and plural forms.
Weak: "Both countries showed different trend in their growth rates."
Good: "Both countries showed different trends in their growth rates."
"Both" is plural. "Trend" is singular. You need "trends." It's simple, but examiners see this mistake dozens of times per week, and it counts against you.
Band 7 requires some variety in sentence structure. Participle phrases (starting with -ing or -ed forms) show you can control grammar, but mess them up and you lose points instantly.
A dangling participle is when the -ing or -ed word doesn't clearly attach to the right subject. This happens constantly in Task 1:
Weak: "Examining the graph, a significant upward trend is evident." (Who is examining? The graph? That doesn't make sense.)
Good: "Examining the graph, we can see a significant upward trend." (Or: "A significant upward trend is evident when examining the graph.")
The safer move? Use a dependent clause instead: "When examining the graph..." or "If we examine the graph..." These are bulletproof and sound natural in academic writing.
You won't use many conditionals in Task 1 (it's descriptive, not hypothetical), but when you do, you'll mess them up. Modal verbs like "may," "could," "would," and "might" appear when you're estimating or hedging. Get these wrong and you've broken basic grammar rules.
Weak: "If the trend continues, sales would reach $5 million by 2025. However, sales could have peaked in 2024."
Good: "If the trend continues, sales will reach $5 million by 2025. However, sales may peak in 2024."
The second conditional (would + base verb) describes imagined situations. The first conditional (will + base verb) describes real projections based on actual trends. Lock in one pattern and you'll sound Band 7.
You've finished your 150-word response. You have 5 minutes left. Use this checklist instead of just re-reading randomly:
Action item: Print this checklist. Do this audit on 10 practice Task 1 essays this month. You'll internalize the patterns and stop making these mistakes in real time, not just when reviewing.
You might think Grammarly or a standard grammar checker will catch everything. It won't. These tools miss context-specific errors all the time, especially in IELTS writing.
A standard grammar checker might not flag "increased to 50 percent" as wrong because the grammar is technically correct (the preposition "to" is valid English). But in IELTS Task 1, it's semantically wrong for describing growth, and an examiner will catch it as a Band 6 error. An IELTS writing checker, by contrast, understands the specific conventions of task 1 correction and flags these mistakes instantly.
What you really need is an IELTS-specific writing evaluator that understands band descriptors, common Task 1 errors, and the exact standards examiners use. When you use an IELTS writing checker, it catches these semantic and grammatical problems that general tools miss. You can also use a band score calculator to see exactly where your grammar weaknesses are costing you points.
Get instant feedback on grammar, vocabulary, coherence, and band score estimates with an IELTS-specific writing checker.
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