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What to Say in IELTS Speaking When You Do Not Know the Answer

IELTS Speaking29 August 2026 · 8 min read · WiderAI Team

When you do not know the answer in IELTS Speaking, say so in fluent English and then speak anyway — speculate, imagine, generalise or borrow someone else's experience. IELTS Speaking is a language test, not a knowledge test. The examiner has no answer key, no opinion they want you to match, and no marks for facts. Every question is simply a prompt designed to make you produce assessable English, so a made-up example delivered fluently scores exactly the same as a true one.

The one response that genuinely damages you is silence, or its close cousin, the bare "I don't know" followed by a full stop. That gives the examiner nothing to assess and interrupts the continuity that the fluency criterion rewards. The skill you need is not knowing more things; it is converting "no idea" into thirty seconds of connected speech, every time, automatically.

This article gives you that conversion kit: buying-time phrases that sound natural rather than memorised, a speculation toolbox for opinion questions, and rescue strategies for the two hardest cases — a Part 2 card about something you have never done, and a vocabulary gap mid-sentence.

Why "I don't know" is never the whole answer

Consider what the examiner is listening for: continuity and coherence, vocabulary range, grammatical range, pronunciation. A question you cannot factually answer still lets you display all four — arguably better than an easy question, because honest speculation naturally pulls out advanced language: I imagine…, it might depend on…, if I had to guess…, presumably…. Hedging and speculating are high-value skills in English, and a question outside your experience is a free invitation to use them.

There is also a scoring mechanic worth knowing: examiners can only rate the language you actually produce. A truthful three-word answer is worth less than an invented three-sentence one, because content accuracy is not assessed at all. Nothing in the test rules requires your examples to be true. Your sister who "studied in Canada" can be entirely fictional; the conditional sentences you build around her are what gets scored.

What phrases buy time without sounding memorised?

The internet's stock fillers — "That's a very interesting question" as a reflex before every answer — are so overused that they signal rehearsal. What sounds natural is a specific reaction to this question, followed by thinking aloud. Build a small personal set from patterns like these and rotate them:

• Honest first reactions: "Hmm, I've honestly never thought about that." / "That's not something that comes up much in my life, but let me see."
• Thinking aloud: "So, off the top of my head…" / "Let me think what the best example would be… right, okay."
• Rephrasing the question: "So you're asking whether the change is mostly positive? I'd say…" — repeating the idea in your own words is both natural and a small paraphrasing exhibit for your vocabulary score.
• Narrowing it down: "That's a big question — maybe I can talk about how it works for students, since that's what I know best."

Two or three seconds of this is enough. The purpose is a bridge into your answer, not a wall in front of it, and one bridge per question is the natural dose.

How do I answer opinion questions when I have no opinion?

Part 3 loves questions you have never once considered: How might climate change affect traditional festivals? Should companies let employees choose their working hours? When no opinion exists, manufacture one on the spot using moves that are themselves band-relevant language:

1. Take both sides, then lean. "I can see arguments both ways. On the one hand… on the other… but if I had to choose, I'd probably say…" — a complete discussion structure from a standing start.
2. Split the question. "I think it depends — for young people, probably yes, because… whereas for older generations…" — instant complexity, and it depends is almost always true.
3. Borrow a perspective. "My father would definitely say no, because… Personally, I'm less sure." Reporting others' views brings in reported speech and contrast markers.
4. Speculate openly. "I really don't know enough about the economics, but presumably smaller businesses would struggle more, because…" — admitting the limit of your knowledge in a full sentence is sophisticated English, not weakness.

Notice none of these requires knowing anything. They are shapes you pour any topic into, and the shapes themselves demonstrate grammatical range: conditionals, concessives, comparatives, modality. For how those structures map to actual scores, see our speaking band descriptors explained guide.

What if the Part 2 card asks about something I have never done?

The long-turn card can land badly: describe a time you got lost hiking, a piece of equipment you repaired, a live sports event you attended — and you have done none of these. You have three clean escape routes, in order of preference:

1. Adapt the nearest true experience. Never attended a live sports match? Describe the big screening you watched in a café with friends, framed honestly: "I haven't been to a stadium, but the closest thing was…". Examiners hear adapted answers all day; a relevant neighbour-topic is completely acceptable.
2. Invent, with specifics. Build the story from real ingredients — a real place you know, a real person, a plausible date — so the details come easily under pressure. Invented answers fail only when they are vague; specificity is what makes speech easy to sustain.
3. Go hypothetical. "To be honest, this has never happened to me, so let me describe what I think it would be like." A talk built on would, imagine and probably is a legitimate long turn and a grammar showcase — just keep it concrete rather than abstract.

Use your one-minute preparation to choose the route and jot five keyword prompts. The worst move is spending the minute mourning the topic. And if you truly do not understand the card's key word, ask — in Part 2 the examiner can typically only repeat the card, but in Parts 1 and 3 asking for a repeat is free and asking to clarify one word is a normal conversational move that costs you nothing. Official test-format details are at ielts.org.

What do I do when the missing thing is a word, not an idea?

Mid-sentence vocabulary gaps get the same treatment: talk around the hole. This is paraphrase, and it is explicitly the kind of resourcefulness the lexical criterion values at the middle and upper bands. Can't retrieve whisk? "One of those kitchen tools you use to mix eggs quickly." Lost scholarship? "Financial support the university gives to strong students." Delivered without panic, a good paraphrase often reads as more skilful than the word itself, because it proves you can keep communication moving with the resources you have — the actual definition of speaking ability.

Train this deliberately: pick ten concrete nouns a day and define each aloud in one sentence without naming it. Then pressure-test everything in this article under exam conditions with an IELTS speaking mock test — unpredictable questions are precisely what makes rescue skills real rather than theoretical.