IELTS Listening Sentence Completion: A Step-by-Step Method

Sentence completion looks simple: you are given a sentence with a gap, and you write the missing words as you hear them. But it is one of the most unforgiving question types in IELTS Listening, because the answer must be spelled correctly, fit the grammar of the sentence, and stay inside a strict word limit — all decided in the second or two before the recording moves on. This guide gives you a repeatable method so that the marks come from planning rather than luck.

What sentence completion actually tests

IELTS Listening runs for about 30 minutes of audio across four sections, with 40 questions in total. In the paper test you then get 10 minutes to transfer your answers to the answer sheet; on the computer-delivered test you get only 2 minutes to check them. Sentence completion appears most often in Section 4 — a single-speaker academic talk — and sometimes in Section 2 or Section 3.

Unlike multiple choice, this type gives you no options to choose from. You complete a sentence that summarises a point from the recording, using words taken directly from the audio. You never change the word, add your own, or paraphrase — if you do, it is marked wrong even when the meaning is right.

The word limit decides everything

Every sentence-completion task carries an instruction like "Write NO MORE THAN TWO WORDS AND/OR A NUMBER". Read it before anything else and hold it in your head, because it is scored with no mercy:

• If the limit is two words and you write three, the answer scores zero, even if two of them are correct.
• A hyphenated item such as well-known counts as one word.
• A number written as a figure — 15 — does not count against a "words" limit when the instruction says "and/or a number".
• Contractions like don't are unusual in answers; write what you hear, but expect real answers to be nouns, short noun phrases, or numbers.

Most correct answers are one or two words. If you find yourself wanting to write four, you have almost certainly misheard the sentence structure.

Predict before you listen

The candidates who do well on this type answer half the question before the audio starts. In the preparation seconds, read each sentence and ask two things:

1. What kind of word is missing? The grammar of the sentence tells you. "The survey was carried out in ______" needs a place or a date. "Researchers were surprised by the ______ of the results" needs a noun. Knowing the word class stops you from writing a verb where a noun belongs.
2. What is the sentence about? The words around the gap are a paraphrase of what the speaker will say. If the sentence reads "The main cause of the decline was ______," listen for the speaker explaining a reason — they may say "what really drove the fall was…" The gap word arrives inside that paraphrase, not next to the exact words on your page.

A worked example

Instruction: Write NO MORE THAN TWO WORDS.

Sentence on the page: "The city introduced the bike-sharing scheme mainly to reduce ______."

Audio: "…and the council's real motivation, more than anything, was to bring down the amount of traffic congestion in the centre."

The recording never says "reduce"; it says "bring down" — a paraphrase you predicted from the sentence. The answer is traffic congestion, exactly two words, taken straight from the speaker. Note the trap: if you had heard "traffic" and written it alone, or added "in the centre" and gone over the limit, you would lose the mark.

Spelling and grammar are marked

Your answer must be spelled correctly and must fit the sentence grammatically. If the sentence needs a plural — "Visitors are advised to bring their own ______" — and you write the singular, it can be marked wrong. British and American spellings are both accepted, but a misspelling is not. This is why the word limit and word class matter so much: writing the plural, the correct part of speech, and the right spelling is what turns a heard word into a scored mark.

Common mistakes that cost marks

• Going over the word limit. The single biggest cause of lost marks. Cut every word the sentence does not need.
• Writing what "sounds right" instead of what is said. The answer is always in the recording; never fill a gap from your own knowledge of the topic.
• Missing the answer while writing the last one. Answers run in the order you hear them. If you fall behind, use the next sentence's keywords to rejoin rather than freezing on the gap you missed.
• Ignoring grammar. A gap after "a" or "an" needs a singular noun; a gap after "the number of" needs a plural. Let the sentence guide you.
• Leaving blanks. There is no penalty for a wrong answer, so always write your best guess.

How to practise it

Do a full set of sentence-completion questions, then review with the transcript open: highlight the exact phrase that delivered each answer, and notice the paraphrase that connected the sentence on the page to the words in the audio. Over a few sessions you will start predicting the paraphrase automatically. Drill complete sets on our IELTS Listening practice page, review the strict spelling, number and word-limit rules that decide these marks, and compare the approach with form and note completion, the two closely related gap-fill types. When you have a raw score out of 40, convert it with the free IELTS band score calculator to see what each recovered mark is worth.