IELTS Grammar Tips for Band 7: Master Complex Sentences

If you want a band 7 in IELTS Writing or Speaking, the examiner needs to see one thing clearly: you can control complex grammar, not just use it by accident. That distinction matters more than most learners realise.

This lesson focuses on one specific skill that separates band 6 from band 7 candidates: using complex sentences with genuine grammatical control. Not longer sentences. Not fancier words. Controlled, accurate complexity.

Why This Actually Matters

The IELTS Writing band descriptors for Grammatical Range and Accuracy at band 7 say a candidate uses “a variety of complex structures” with “frequent error-free sentences.” That word frequent is doing a lot of work. It means errors are occasional, not constant.

Many learners hit band 6 and get stuck there. They write longer sentences hoping that looks more advanced, but longer sentences with consistent errors actually pull your score down. The examiner is trained to notice this.

In everyday professional communication — emails, reports, presentations — the same principle applies. A sentence that is precise and correct is always more impressive than one that is ambitious and broken.

The Lesson: Subordination Done Properly

Complex sentences use subordinate clauses. A subordinate clause cannot stand alone — it depends on a main clause to make sense. This is the engine of sophisticated grammar in English.

Here are the three subordinate clause types you need to control for band 7:

1. Adverbial clauses — show time, cause, condition, or contrast
2. Relative clauses — give information about a noun
3. Noun clauses — act as the subject or object of a sentence

Let’s look at each one with a real example from an IELTS Task 2 context.

Adverbial clause (condition):

Although governments have invested heavily in public transport, many citizens still prefer to drive.

Notice the comma after the subordinate clause when it comes first. That comma is not optional.

Relative clause (defining):

Companies that fail to adopt sustainable practices will face increasing regulatory pressure.

No comma before that in a defining relative clause. The clause identifies which companies we mean.

Noun clause (as object):

Research suggests that urban populations will continue to grow throughout this century.

The noun clause that urban populations will continue to grow is the object of suggests. This structure appears constantly in academic writing, and it reads as mature and controlled.

You do not need to use all three in every paragraph. You need to use them correctly when you do use them. Consistency is what earns band 7. Getting this kind of structured feedback on your writing regularly is exactly what the daily coaching sessions at richardg.xyz are built around. For more details, click here.

The Common Mistake (And the Fix)

The most frequent error at this level is what teachers sometimes call clause collision: joining two clauses together without the right connector, or using the wrong connector entirely.

Here is a typical band 6 sentence:

Although technology has improved education, but some students still struggle to access it.

This is a very common error. The writer has used although at the start and then added but in the middle. You cannot use both. They do the same job. Pick one structure and commit to it.

Corrected version (using although):

Although technology has improved education, some students still struggle to access it.

Corrected version (using but):

Technology has improved education, but some students still struggle to access it.

Both are correct. The original is neither. This error appears so often in IELTS scripts that examiners see it daily. Eliminating it from your writing is a quick, concrete step toward band 7.

A similar collision happens with because and so:

Because the government cut funding, so services were reduced.

Again, one connector too many. Use because the government cut funding, services were reduced, or the government cut funding, so services were reduced. Not both.

Three Practice Tips You Can Use Today

1. Sentence surgery. Take something you wrote recently — an email, a practice essay, anything. Find every sentence longer than 20 words. Read each one aloud. If it sounds tangled or you have to pause mid-sentence to figure out what it means, rewrite it. Clarity first, complexity second.
2. Connector audit. Write a list of the subordinating conjunctions you actually use: although, because, while, since, unless, even though, provided that. For each one, write two sentences this week using it correctly. Then check: did you accidentally double up with a second connector? Remove it if so.
3. Read one paragraph of quality writing aloud each day. Use an editorial from a broadsheet newspaper or a well-written report. Pay attention to where the writer uses complex sentences and how they handle punctuation. Your ear will start to absorb the rhythm of accurate, sophisticated English. That rhythm eventually transfers to your own writing.

Vocabulary to Know

• subordinate clause /səˈbɔːdɪnət klɔːz/ – Level: B2 – a clause that cannot stand alone as a sentence and depends on a main clause for its meaning – Example: In the sentence “She left because she was tired,” the subordinate clause is “because she was tired.”
• adverbial clause /ədˈvɜːbiəl klɔːz/ – Level: B2 – a subordinate clause that functions like an adverb, modifying a verb by expressing time, cause, condition, or contrast – Example: Unless demand increases, the company will reduce production — an adverbial clause of condition.
• defining relative clause /dɪˈfaɪnɪŋ ˈrelətɪv klɔːz/ – Level: C1 – a relative clause that identifies which specific person or thing is meant, with no commas – Example: Employees that meet their targets will receive a bonus.
• connector /kəˈnektə/ – Level: B1 – a word or phrase that links clauses or sentences, such as although, because, or however – Example: The report was long; however, the key findings were easy to locate.
• grammatical range /ɡrəˈmætɪkəl reɪndʒ/ – Level: C1 – the variety of grammatical structures a speaker or writer is able to use correctly – Example: Her grammatical range impressed the examiner — she moved confidently between simple, compound, and complex sentences.
• clause collision /klɔːz kəˈlɪʒən/ – Level: C1 – an informal term for the error of using two connectors that perform the same function in one sentence – Example: “Although it rained, but we continued” is a clause collision — remove one connector.
• syntactic control /sɪnˈtæktɪk kənˈtrəʊl/ – Level: C2 – a writer’s or speaker’s ability to construct sentences with deliberate, accurate grammatical structure – Example: Strong syntactic control is what distinguishes a band 7 candidate from a band 6 in IELTS Writing.
• error-free sentence /ˈerə friː ˈsentəns/ – Level: B1 – a sentence that contains no grammatical, punctuation, or lexical errors – Example: The examiner noted that most of her sentences were error-free, which pushed her score to band 7.
• commit to a structure /kəˈmɪt tuː ə ˈstrʌktʃə/ – Level: B2 – to choose one grammatical pattern and complete it correctly rather than mixing approaches mid-sentence – Example: Once you begin with “although,” commit to that structure and do not add “but” later in the same sentence.

FAQ

Does this apply to IELTS Speaking as well as Writing?

Yes, though the standard is slightly different. In Speaking, occasional self-correction is fine and actually shows awareness. The examiner wants to hear you attempting complex structures. In Writing, there is no self-correction — the words on the page are the final product, so accuracy matters more there. That said, practising complex sentences in speaking will absolutely help your writing fluency over time.

How many complex sentences do I need in a Task 2 essay?

There is no magic number, and trying to hit a quota will make your writing feel mechanical. Aim for a natural mix: some simple sentences for clarity, some compound sentences for flow, and several well-controlled complex sentences to demonstrate your range. If every sentence is complex, the writing becomes exhausting to read. Variety, used accurately, is the goal.

I know these rules but I still make errors under exam pressure. What helps?

This is extremely common and honest to admit. The answer is not more study — it is more timed practice with feedback. Writing under pressure is a skill separate from knowing grammar rules. You build it by doing it repeatedly, getting specific corrections, and adjusting. There is no shortcut, but the process does work if you are consistent.

One Final Thought

Band 7 grammar is not about showing off. It is about showing the examiner that you are in control of the language, that your sentences mean what you intend them to mean, and that your errors are genuinely occasional rather than systematic. That is a realistic target, and it comes from focused, corrected practice rather than simply writing more.

If you want that kind of focused practice with real feedback on your sentences, the daily coaching sessions are exactly that kind of work. For more details, click here.