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Complex Sentences for IELTS Speaking, Without Tying Yourself Up

IELTS Speaking29 August 2026 · 7 min read · WiderAI Team

To score band 7 or above for grammar in IELTS Speaking, you need to use complex sentences frequently and with reasonable accuracy — but "complex" means something much more modest than most candidates think. In grammar terms, a complex sentence is simply one containing a subordinate clause: "I moved here because my sister was studying nearby" is a complex sentence. That is the level of structure examiners are listening for, produced naturally and often.

The mistake that ties candidates up is confusing complex with complicated. They attempt fifty-word constructions with three nested clauses, lose the thread halfway, and produce wreckage — which damages fluency and accuracy at the same time. Meanwhile the candidate who says "If I'd known how cold it gets, I would have packed differently" has just produced a flawless third conditional in twelve easy words.

So the real skill is not building longer sentences. It is mixing short, punchy simple sentences with a repertoire of spoken subordinate structures you can produce without thinking. This article gives you that repertoire and the drills to automate it.

What counts as a complex sentence in IELTS speaking?

The Grammatical Range and Accuracy criterion rewards two things together: range — attempting a variety of structures, not just subject-verb-object — and accuracy — how much of your speech is error-free. A complex sentence, for scoring purposes, is any sentence where one clause depends on another:

• "Although I enjoy my job, the commute is exhausting." (concession)
• "When I was living in Tashkent, I used to walk everywhere." (time clause)
• "What worries me most is the cost." (noun clause as subject)
• "The teacher who influenced me most was actually my strictest one." (relative clause)
• "If public transport were better, fewer people would drive." (conditional)

Notice how conversational these all are. Native speakers produce sentences like this constantly and unconsciously — which is exactly why examiners treat them as evidence of real proficiency rather than exam preparation. You do not need participle clauses, inversion, or cleft sentences to reach band 7; you need this everyday level of subordination appearing regularly, alongside simple sentences, with most attempts coming out clean.

Which five structures give the best return?

If you automate just five spoken patterns, you cover the range requirement for almost any question the test can ask.

1. Because / since for reasons. The workhorse. Every Part 1 answer can carry one: "I don't cook much, mainly because I get home so late."
2. Although / even though for concessions. The band-raiser, because it signals balanced thinking and forces a two-clause sentence: "Even though the city's crowded, I'd never leave it."
3. When / while + past tenses for stories. Essential for Part 2: "While I was waiting for the results, I kept checking my phone every two minutes."
4. Conditionals for opinions and speculation. Second and third conditionals are Part 3 gold: "If universities were free, more people from small towns would apply." "If I hadn't taken that course, I'd probably still be doing the same job."
5. What-clauses for emphasis. A very natural way to sound structured: "What I like most about the idea is its simplicity." "What people forget is that this takes years."

Each of these is short, spoken, and combinable. A band 7-8 Part 3 answer is often nothing more than these five patterns taking turns: a position with what, a reason with because, a speculation with would, and a concession with although to finish.

When is a simple sentence the better choice?

More often than candidates believe. Examiners reward a mix — the top descriptors describe a full range of structures used flexibly, and flexibility includes knowing when to be brief. Three moments where simple sentences win:

• Making the main point. "I disagree." followed by complex justification is far stronger than burying your position inside a subordinate clause the listener has to excavate.
• After a long sentence. Rhythm matters for coherence. Long-long-long exhausts a listener; long-short-long carries them. Band 9 speech has a pulse.
• When you feel the sentence escaping. If you are three clauses deep and can no longer feel where the sentence lands, finish it in the simplest legal way and start fresh. A completed simple sentence beats an abandoned complex one every time — an abandoned structure is scored as an error, a completed plain one is not.

This is the "without tying yourself up" principle: complexity should never be attempted at the cost of completion. Your working rule can be mechanical — maximum two clauses per sentence until two-clause sentences are effortless. Then let a third clause in occasionally, where the idea genuinely needs it.

How do you make complex structures automatic?

Knowing these patterns and producing them at speed are different abilities, and only the second one scores. Three drills close the gap.

The one-structure day. Pick a single pattern — say, although — and use it in every spoken practice answer for a day. Ten forced repetitions in real answers embed a structure more deeply than a hundred gap-fill exercises, because retrieval is trained under the same conditions the exam will demand.

Expand-aloud. Take five simple sentences about your own life ("I like my neighbourhood") and expand each aloud in three different ways: with a reason, with a concession, with a relative clause ("…which surprises people, because it's quite noisy"). This trains the choice between structures, not just their existence.

Transcript grading. After a recorded practice session or a full IELTS speaking mock test, read your transcript and mark every sentence S (simple) or C (complex), and every C as clean or broken. Two numbers emerge: your complexity ratio and your accuracy rate. Band 7 needs frequent Cs with most of them clean; if your Cs are rare, drill production; if they are frequent but broken, shorten them and rebuild. The speaking band descriptors explained show how examiners weigh exactly this trade-off, and the official criteria summaries at ielts.org confirm that range and accuracy are assessed together, not separately.

The destination is worth naming. You are not trying to perform complex grammar for 14 minutes; you are trying to reach the point where subordination is simply how your English works — where "although" arrives because you actually see the other side of the argument. Train the five patterns until they are reflexes, keep every sentence finishable, and the grammar score follows the thinking.