Short answer: sentence completion gives you sentences with gaps and asks you to fill each one with words taken directly from the recording, inside a stated word limit.
Two things decide the mark, and both happen before the audio plays: reading the gaps to predict what kind of word each one needs, and noting the word limit so you do not write a correct answer that gets voided for being one word too long.
It appears across all four parts of the Listening test and is one of the six official question-type categories. The gaps follow the order of the recording, which is the single most useful structural fact about it.
Predict the word class of every gap
The sentence around a gap is grammatical, so it constrains what can fill it. Spending the preparation time on this converts listening from "catch everything" to "wait for one specific kind of word".
| The sentence reads | The gap must be | Listen for |
|---|---|---|
| "The museum was founded in ______." | A year or a date | Digits — and a possible correction afterwards |
| "Visitors should bring a ______ and comfortable shoes." | A singular countable noun | An object; "a" tells you it is singular |
| "The scheme was ______ successful in rural areas." | An adverb | -ly words: particularly, especially, largely |
| "Researchers ______ the samples before analysis." | A verb in past tense | The verb, and check the tense the sentence forces |
| "The course costs ______ per term." | A number with a currency | A figure — and note whether the unit is already printed |
| "Students must submit their ______ forms by Friday." | An adjective or noun modifier | The word directly before "forms" |
Do this in the seconds the recording gives you before each section, and mark the prediction on the page — "yr", "n", "adj". When the audio runs, you are matching a shape rather than transcribing a sentence, which is far less demanding under one-play conditions.
The word-limit rules that void correct answers
This is where the most marks are lost for reasons that have nothing to do with listening.
- The limit is absolute. "NO MORE THAN TWO WORDS AND/OR A NUMBER" means a three-word answer is marked wrong even when it is exactly what the speaker said.
- Read the instruction once per task, not once per test. Different question sets on the same paper can carry different limits.
- Hyphenated words count as one word. "Part-time" is one.
- A number counts as one item, and "AND/OR A NUMBER" means you can have your words plus a figure.
- Do not add words the sentence already contains. If the sentence reads "costs $______ per term", write the figure only — repeating the dollar sign or "per term" can push you over the limit.
- Articles usually are not needed. "A" and "the" count toward the limit, so include one only if the sentence genuinely requires it.
You must use the words you hear
This is the rule that separates Listening completion from anything you do in Writing. The answer has to be the speaker's word, spelled correctly. A synonym is marked wrong even when it means the same thing.
| The speaker says | Candidate writes | Result |
|---|---|---|
| "…a wildlife reserve" | sanctuary | Wrong — a synonym, not the word used |
| "…opens at nine thirty" | 9.30 | Accepted — standard numeral forms are fine |
| "…the accommodation office" | acommodation | Wrong — spelling counts in Listening |
| "…two bicycles" | bicycle | Wrong — the plural is part of the word |
Spelling and number formats are where completion answers actually die, and they are trainable in a way that listening comprehension is not — the spelling and numbers guide covers the specific set that recurs: dates, phone numbers, postcodes, spelled-out surnames, and the British conventions the recordings use.
The correction trap
IELTS recordings imitate real speech, and real speakers correct themselves. In Parts 2, 3 and 4 especially, the first version of a detail is frequently withdrawn a sentence later.
"The session starts at four — sorry, no, they moved it to four thirty last month."
"You'll need your student card and a passport photo. Actually, forget the photo, they take one at the desk — just the card."
The answer is always the corrected version. Signals to listen for: sorry, actually, no wait, I mean, in fact, on second thoughts, they've changed that.
The practical habit is to write the first answer lightly and stay listening through the end of the sentence rather than looking away as soon as something plausible arrives.
This is the same mechanism covered in distractors and corrections, and it is the most common single loss in Parts 3 and 4.
If you miss a gap
Because the gaps run in the recording's order, a missed answer is recoverable and a missed position is not. The rule:
- Leave it and jump to the next gap immediately. Do not keep listening for the answer you missed — the recording has moved on and you will lose the next one too.
- Use the printed sentences as a tracker. If you hear content matching gap 24 while you are still waiting on 23, you have lost 23; accept it and lock on to 24.
- Guess before the section ends, using your word-class prediction. A plausible noun in a noun slot is occasionally right and a blank never is.
- Never leave a blank. There is no negative marking in IELTS Listening.
How sentence completion differs by part
| Part | Context | What changes |
|---|---|---|
| 1 | Everyday conversation, two speakers | Answers are concrete — names, numbers, addresses. Spelling and digits carry most of the marks. |
| 2 | Monologue on a social topic | More corrections and more detail crowding. The speaker lists several options before settling. |
| 3 | Academic discussion, two to four speakers | Hardest for this type — the answer may be confirmed by a second speaker rather than stated by the first. |
| 4 | Academic lecture, one speaker, no break | Denser vocabulary and no pause in the middle. Prediction matters most here because there is no second chance to reorient. |
Part 4 deserves a note: it runs without the mid-section break the other parts have, so losing your place is more costly. The per-part strategies are in the Part 4 guide, and the same completion logic applied to a printed form is in form completion.
A five-step routine for every sentence-completion task
- Read the instruction and circle the word limit.
- Read all the gapped sentences in the preparation time, in order.
- Mark a word class beside each gap — n, adj, vb, number, date.
- Underline the words either side of the gap. Those are your cue that the answer is arriving, though expect them to be paraphrased in the audio.
- Listen forward. Write as you hear, stay in the sentence until it ends in case of a correction, and move on the moment the next gap's content starts.
Step four is worth expanding: the words around the gap are almost never repeated verbatim in the recording. If the sentence says "the project was funded by", the audio may say "the money came from".
You are listening for the idea of the cue and the word class of the answer — which is why prediction beats transcription on this type.
The only way to train one-play listening is under one-play conditions, which is what the guided Listening tests enforce: full papers, an answer key with a note on what each distractor was doing, and no replay.
If you want the cross-skill version of the same task, Reading sentence completion shares the word-limit and gap-grammar rules while removing the time pressure that makes this one hard.