Part 5: Cause, Effect and Hypothesis Patterns in IELTS Speaking

In one line: IELTS Speaking Part 5 sentence patterns: cause frames, consequence chains, hypothesising and modal deduction that lift bands — exam-ready notes.

Related: Part 4: Opinion and Comparison Patterns in IELTS Speaking

Part 3 of the Speaking test does not ask what you know. It asks you to explain and imagine. Why do people move to cities? What would change if offices disappeared? Who is responsible for childhood habits? Every one of those is a cause question, an effect question or a hypothesis question wearing different clothes. This card is the pattern kit for those three functions. The fifth instalment of the sentence-pattern series (Parts 1–4 cover the everyday, question-response, advanced and opinion-comparison sets).

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Why Cause, Effect and Hypothesis Decide Bands

The Part 3 reality. The follow-up questions of Speaking Part 3 are overwhelmingly why-, what-would- and how-come prompts. Explanation and imagination, in that order. A candidate who can give a cause, trace its effect and then hypothesise beyond it is demonstrating exactly the extended turn the band descriptors demand.

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The descriptor fit. Fluency and Coherence rewards answers that develop. A cause-effect chain is development by definition. Grammatical Range rewards conditionals and modals. The grammar of hypothesising is complex grammar on a plate. Lexical Resource rewards cause-and-result phrasing beyond “because”.

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The examiner’s ear. Band 6 says “because it is cheaper”. Band 7 says “mainly because it works out cheaper, which is why you see so many people doing it. Though if salaries rose, I suspect that would change fairly quickly.” Same question. The second answer causes, effects and hypothesises in three moves. That reflex — not vocabulary size — is what this card trains.

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The Pattern Families at a Glance

Three functions, eight families — the map of this card.

• Cause openers: the main reason is…, largely because…, it comes down to…, it has a lot to do with…
• Weak-cause honesty: one factor is…, part of it is…, that partly explains…
• Result linkers: which means…, so that’s why…, and as a result…, that’s what leads to…
• Chained consequences: this, in turn,…, which then…, and before you know it,…
• Hypothesis engines: if X were…, I would…, supposing…, imagine if…, were people to…
• Modal deduction (present): must be…, can’t be…, may/might well be…
• Modal deduction (past): must have…, can’t have…, might have…
• Unreal past and regret: if I had…, I would have…, I wish I had…

Giving Causes: The Core Patterns

Four frames, drilled until they are reflexes.

The direct cause. Because + clause; because of + noun (“because the metro is faster”, “because of the metro”). The safest frame in English — and the one to grow beyond.

The upgraded cause. The main reason is that…; largely because…; it mainly comes down to…. Frames that rank the cause instead of just stating it. Ranking language (“mainly”, “largely”, “first and foremost”) is band-7 evidence because analysis, not memory, ranks things.

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The personal-grounded cause. From what I’ve seen…; speaking from my own city…; in my experience, it usually boils down to… — evidence-based explanation, which Part 3 rewards over generalisation.

The multi-cause frame. There are a couple of reasons — firstly…, and on top of that…; it’s partly X and partly Y — the two-cause answer that doubles your speaking time without repetition.

Drill: one question (“Why do people prefer online shopping?”), all four cause frames, sixty seconds each, rotating. Variety among frames matters more than any single frame.

Chains: Cause to Consequence in Two Steps

The chain is the band-7 turn’s spine — cause, then what it causes, then what that causes.

• The linkers: so…, which means…, and as a result…, that’s why you see…, which tends to…
• The two-step: “People work longer hours, which means they have less time to cook — so street food ends up booming.”
• The snowball: “this, in turn,…; and before you know it,…” —

(“Prices rise, so families cut back, which in turn hurts small shops — and before you know it, the whole high street is struggling.”)

The exam habit: after every cause you give, ask yourself “and then what?” One “which means…” per answer already separates you from the one-clause crowd; two steps are plenty — chains of four collapse into rambling.

Talking Effects: Result Language

When the question asks what something does (not why it exists), lead with the effect frame.

• The direct effect: it leads to…, it results in…, the effect is that…, it has made… + past participle (“it has made cycling far more popular”).
• The scaled effect: it has had a huge impact on…, it has completely changed the way people…, it barely affects… — scaling vocabulary (huge, considerable, marginal) that grades the result instead of asserting it.
• The two-sided effect: on the plus side…, but the downside is…;

it’s a double-edged sword: … — the balanced-effect answer examiners mark as developed.

Hypothesising: The Second Conditional Engine

The what-would questions (“Would people cycle more if fuel got expensive?”, “What would your city be like without cars?”) run on the second conditional — the highest-value structure in Part 3.

• The engine: If + past simple, would + base verb — “If fuel became expensive, people would think twice about driving.”
• The formal variant: Were fuel to become expensive,… — rare, correct, and instantly band 8 in grammar terms.
• The openers: Supposing…, Imagine if…, If it were up to me,… Hypothetically speaking,…
• The graded guess: would definitely/most probably/quite possibly/

might just — the adverbs that scale your confidence, exactly as the hedging card (Part 4) scaled opinions.

Drill: “What would happen if your city banned cars tomorrow?” — answer with the engine, one graded adverb, one chain step. Ninety seconds, recording on, three different openers across three takes.

Speculating: Modals of Deduction

The who/why-mystery questions (“Why do you think fewer young people vote?”) want calibrated guessing about the present and past.

• Present deduction: It must be expensive to run… (confident); It could/might simply be that… (open); That can’t be the real reason… (confident negative).
• Past deduction: The scheme must have helped…; They can’t have known about…; A lot of people may have lost track of the deadline — must/might/can’t + have + past participle, the single most band-dense structure in speculation.
• The reporting frame: I’d imagine…, I suspect…, My guess is that…,

though I could be wrong — frames that keep the examiner comfortable and your fluency unbroken.

Unreal Past and Regret Frames

The personal-hindsight prompts (“Is there anything you would change about your school days?”) run on the third conditional and wish-clauses.

• The engine: If I had + past participle, I would have + past participle — “If I had taken music seriously, I would have kept it up for life.”
• The regret shortcut: I wish I had…; If only I’d… — two frames, endless use.
• The mixed frame (past cause, present result): “If I had learned

to swim back then, I would be a lot fitter today” — mixed conditionals are band-8 grammar demonstrated in one sentence.

Common Mistakes That Crash Bands

• Because-of confusion. Because + clause (“because it is cheap”), because of + noun (“because of the price”) — the swap is a grammar-band marker examiners hear instantly.
• Would with present-reality. “If I will win…” and “If I would have money…” — the conditional’s tense discipline (past form in the if-clause, no will) is the most-tested slip in Part 3.
• Chain without a brake. Four linked consequences turn development into rambling — two steps, then stop and conclude (“so overall, I’d say it’s been a good thing”).
• Certainty about the unknowable. “This is why young people don’t

vote” — without a modal — asserts what no speaker can know; must/ might/would keeps the same content at band 7 instead of band 6.

How Examiners Probe These Functions

• “Why do you think…?” — cause + ranked reason.
• “What effect has X had on…?” — scaled effect, two-sided.
• “Would people… if…?” / “What would change if…?” — second conditional with graded confidence.
• “Who do you think is responsible for…?” — modal deduction on actors.
• “Is there anything you’d change about…?” — third conditional or wish.

Hear the function first; reach for the family second. The families are finite; the questions are not.

Quick Revision: One-Glance Frames

Conclusion: Functions First, Words Second

Cause, effect and hypothesis are the three verbs of Part 3. The rest is wardrobe. Drill the eight families until the frame arrives before the vocabulary does; scale every claim (mainly, might, would definitely). Chain twice and stop. Pair this card with the follow-up depth method (IELTS Prep Part 5) and the hedging set (Part 4), and the explanation turn stops being the scary minute of the test. It becomes the minute where the band is won.

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Frequently Asked Questions

Which conditional matters most for IELTS Speaking?

The second (if + past, would) — Part 3’s what-would questions run on it. The third conditional earns its keep on personal-regret prompts; one clean example per test is plenty.

How do I avoid sounding unsure while hedging?

Hedge the claim, not the delivery: “I’d say the main reason is X, though there could be others” is confident speech about an uncertain world — the descriptors read that flexibility, not doubt.

Is “due to” as good as “because of”?

Grammatically both take nouns (“due to the rain”, “because of the rain”); both are band-neutral. The band lives in the upgraded frames — “the main reason is that…”, “it comes down to…” — which due to cannot replace.

How long should a cause-effect answer run?

Three to five sentences: one cause frame, one chain step, one graded conclusion — roughly forty seconds. Depth beats length; so does knowing when to land the plane.

Can I use these patterns in Writing Task 2?

Yes — cause and consequence linkers transfer directly; the speculative modals are speaking-flavoured and should be used sparingly in academic writing, where evidence outranks imagination.

Related explainers

• Part 1: Most Commonly Used Sentence Patterns in IELTS Speaking
• Part 2 and Part 3 of the sentence-pattern series
• Part 4: Opinion and Comparison Patterns in IELTS Speaking
• IELTS Prep Part 5: Speaking Part 3 — the Follow-up Depth Method

Written and maintained by the Hmmnm Editorial Team — exam mentors and subject editors. Every card is compiled against the official sources listed and re-checked each cycle.

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