IELTS Task 2 Complex Sentences: 7 Patterns for Band 8
Quick answer: Band 8 needs a wide range of structures with most sentences error-free. Use 5 to 7 different complex patterns, such as concession, relative clauses and conditionals, keep them short enough to control, and cut repeated small errors.↗ Share on X
To use complex sentences for Band 8 in IELTS Writing Task 2, you need a mix of sentence types that you control without errors, not long sentences everywhere. The Band 8 descriptor for Grammatical Range and Accuracy asks for "a wide range of structures" where "the majority of sentences are error-free." In practice, that means using 5 to 7 different complex patterns across your essay, such as relative clauses, conditionals and concession clauses, while keeping each one short enough that you never lose control of it.
Below are 7 patterns that work, ready-to-use examples on a common topic, and a practice plan.
What is a complex sentence, in simple terms?
IELTS Writing Task 2 in 40 Minutes: A Minute-by-Minute Plan →
IELTS Task 2: Paraphrase the Question and Keep Its Meaning →
IELTS Speaking Part 3: How to Answer Abstract Questions →A complex sentence has one main idea that can stand alone (the main clause) and at least one extra idea that cannot stand alone (the dependent clause). The dependent clause usually starts with a linking word like *although*, *because*, *which*, *if* or *unless*.
- Simple: *Cities are growing.*
- Compound (two main ideas joined by *and/but/so*): *Cities are growing, and traffic is getting worse.*
- Complex: *Because cities are growing so quickly, traffic is getting worse.*
Grammar makes up 25% of your Task 2 score. The other three criteria are Task Response, Coherence and Cohesion, and Lexical Resource. So complex sentences help, but only if they also make your argument clearer.
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How is Band 7 different from Band 8 in grammar?
| Band | What examiners look for |
|---|---|
| 6 | A mix of simple and complex sentences; some errors, but they rarely make meaning unclear |
| 7 | A variety of complex structures; frequent error-free sentences; good control of grammar and punctuation, with a few errors |
| 8 | A wide range of structures; the majority of sentences error-free; only occasional, non-systematic errors |
The jump from 7 to 8 is mostly about accuracy. Many Band 7 writers already use complex sentences. What holds them back is repeated small errors: a missing article, a wrong verb form, a comma in the wrong place. A Band 8 essay uses a range of structures *and* makes almost no repeated mistakes.
Which 7 complex sentence patterns should you learn?
IELTS Task 2 Examples: How to Back Up Every Argument Fast →
IELTS Task 2 Linking Words: Use Fewer, Score Higher →
IELTS Spelling Mistakes: A 4-Week Fix for Task 1 and Task 2 →All examples use one common Task 2 topic: *Some people believe governments should invest more in public transport than in roads.*
1. Concession: although / even though / while
Use it to admit the other side, then push your view.
*Although building new roads may ease congestion in the short term, investment in public transport offers a more lasting solution.*
Common error: writing *Although… but…* in the same sentence. Use one or the other, never both.
2. Non-defining relative clause: , which / , who
Use it to add extra information about a noun. Note the commas.
*Many cities have expanded their metro systems, which has reduced the number of cars entering the centre.*
Tip: *which* can refer to the whole previous idea, as in this example. That is a sign of good control.
3. Defining relative clause: that / who / where
Use it to say exactly which thing you mean. No commas.
*Commuters who live in outer suburbs often have no realistic alternative to driving.*
4. Conditional: if / unless / provided that
Use it to show consequences. Mixing types shows range.
- First conditional (real future): *If governments fund bus networks properly, fewer people will need cars.*
- Second conditional (imagined): *If public transport were free, ridership would likely rise sharply.*
- With *unless*: *Unless fares remain affordable, low-income workers will continue to struggle.*
5. Cause and result: because / since / so … that
*Trains can carry hundreds of passengers at once, so they use road space far more efficiently than private cars.*
*Traffic in some capitals has become so severe that journeys of ten kilometres can take over an hour.*
Be careful with the second example: only use numbers in your essay if they are clearly general or hypothetical. You do not need real statistics in Task 2.
6. Participle clause: -ing / -ed at the start
This is an advanced pattern and examiners notice it. The subject of both parts must be the same.
*Faced with rising pollution levels, many governments have started to restrict car use in city centres.*
Common error (dangling participle): *Walking to the station, the rain started.* The rain was not walking. Correct: *Walking to the station, I got caught in the rain.*
7. Noun clause: what / whether / the fact that
Use it to turn an idea into the subject or object of a sentence.
*What many critics overlook is that roads also require constant and costly maintenance.*
*Whether these projects succeed depends largely on long-term funding.*
How many complex sentences should one essay have?
There is no official number. A practical target for a 270–300 word essay (the minimum is 250 words):
- Introduction (2–3 sentences): 1 complex sentence, often a concession or a noun clause in your thesis.
- Each body paragraph (4–6 sentences): 2–3 complex sentences, mixed with 1–2 short, direct ones.
- Conclusion (2 sentences): 1 complex sentence, often a conditional.
That gives you roughly 6–9 complex sentences, using at least 5 different patterns. Short sentences are not a weakness. A short sentence after a long one makes your point hit harder:
*Although motorways connect regions and support trade, they also encourage more driving, which in turn leads to further congestion. The problem simply moves.*
What mistakes stop candidates from reaching Band 8?
1. Overlong sentences. Sentences over 40 words often contain errors and confuse the reader. If you need two lines, split it.
2. Comma splices. Joining two full sentences with only a comma: *Public transport is cheaper, it is also greener.* Use a full stop, a semicolon, or a linking word.
3. Fragments. A dependent clause alone: *Because roads are expensive.* This is not a full sentence.
4. Using the same pattern again and again. Five *although* sentences do not show range.
5. Memorised templates. Phrases like *"It is an undeniable fact that…"* add words but no meaning. Examiners are trained to spot them.
6. Article errors. *The government*, *a solution*, *public transport* (no article). These small repeated errors cost more than a missing complex sentence.
What does a Band 8 style paragraph look like?
*Those who favour road investment argue that cars remain the most flexible way to travel. While this is true for rural areas, it is far less convincing in large cities, where space is limited and congestion is already severe. If governments continue to prioritise roads, they will simply attract more vehicles, which will eventually cancel out any improvement. Public transport, by contrast, moves large numbers of people using a fraction of the space. This makes it the more sustainable choice.*
Count the patterns: defining relative clause (*Those who…*), concession (*While…*), non-defining relative clause (*, where…*), first conditional (*If…*), another relative clause (*, which…*), and two short direct sentences for contrast. That is range, with control.
How can you practise this in two weeks?
1. Days 1–3: Learn patterns 1–3. Write 5 sentences for each on any Task 2 topic.
2. Days 4–6: Learn patterns 4–5. Rewrite an old essay, replacing 3 simple sentences with complex ones.
3. Days 7–9: Learn patterns 6–7. These are the hardest, so write 10 sentences each and check the subject in every participle clause.
4. Days 10–12: Write one full essay per day in 40 minutes. Afterwards, underline every complex sentence and label its pattern.
5. Days 13–14: Go back through all your essays and list every grammar error you made. Look for the ones that repeat. Those repeated errors are your real barrier to Band 8.
What should you do next?
Take one Task 2 essay you have already written. Highlight every sentence in it. Mark each one S (simple), C (compound) or X (complex). If fewer than a third are X, or if all your X sentences use the same linking word, rewrite three of them today using patterns you have not tried yet. Then read each new sentence aloud. If you run out of breath, it is too long, so split it.
FAQ
How many complex sentences do I need for Band 8?
There is no official number. Around 6 to 9 in a 270 to 300 word essay, using at least 5 different patterns, is a practical target.
Are long sentences better for IELTS?
No. Very long sentences often contain errors. Accuracy matters more than length, and short sentences add clarity.
What is the difference between Band 7 and Band 8 grammar?
Both use complex structures. Band 8 has a wider range and most sentences are error-free, with only occasional, non-repeating mistakes.