IELTS Reading Sentence Completion: Strategy, Traps and a Worked Example

Sentence completion should be the question type you bank marks on. The answers appear in passage order, they must be words copied exactly from the text, and grammar narrows down what can possibly fit each gap. Yet candidates lose marks on it constantly — through word-limit slips, through copying the wrong word from the right sentence, and through paraphrase blindness. This guide gives you a reliable method, a worked example, and the specific traps to train against.

What the question type asks

You are given a set of incomplete sentences that summarise or restate points from the passage, and an instruction such as "Complete the sentences below. Choose NO MORE THAN TWO WORDS from the passage for each answer." Three rules define the type:

• The answers come from the passage, verbatim. You copy words exactly as they appear — no changing the form, no supplying your own synonym.
• The word limit is absolute. "No more than two words" means a three-word answer scores zero even if it contains the right words. Numbers count as allowed separately when the instruction says "and/or a number."
• The questions follow passage order. The answer to question 32 sits after the answer to 31. This makes location dramatically easier — never waste it.

The five-step method

1. Read the instruction and fix the word limit in your head. Say it to yourself: "two words max." This is the cheapest mark-protection in the whole test.
2. Read the incomplete sentence and predict the answer's grammar. Before touching the passage, decide what kind of word must fill the gap. After "a" or "the," a noun is coming; after "to," a verb; before a noun, likely an adjective. Often you can also predict the meaning category — a material, a date, a reason.
3. Choose your locator keywords. Pick the words in the sentence least likely to be paraphrased — names, numbers, technical terms — and scan for them or their synonyms. Expect the everyday words to be paraphrased; that is the test's whole design.
4. Read the matching sentence in the passage carefully — the full sentence, not just the phrase around your keyword. The gap's answer is usually within a line or two of the locator.
5. Copy the answer exactly, then re-read the completed sentence. It must be grammatical and mean what the passage means. If the completed sentence is grammatical nonsense, you have the wrong word; if it is grammatical but says something the passage does not, you have fallen for a nearby distractor.

A worked example

Passage extract: "The bridge's designers initially proposed steel for the main cables, but persistent corrosion in the coastal air forced a switch to a zinc-coated alloy, which more than doubled the projected budget."

Question: The change of material was caused by ________ . (NO MORE THAN TWO WORDS)

Prediction: the gap follows "by," so a noun phrase is coming, and the sentence demands a cause. Locators: "change of material" — which the passage paraphrases as "a switch to a zinc-coated alloy." The cause in the text is "persistent corrosion." Answer: persistent corrosion (or "corrosion" alone, which also fits grammatically and stays inside the limit). The tempting wrong answers show the classic traps: "coastal air" is nearby and related but is where the corrosion happened, not the stated cause; "zinc-coated alloy" is what they changed to, not why. Both would complete the sentence grammatically — only meaning rules them out.

The traps, named

• The word-limit trap. The passage says "the remarkably durable zinc-coated alloy" and the limit is two words. Candidates who copy modifiers they do not need break the limit. Strip an answer to its essential words.
• The wrong-noun trap. The located sentence usually contains several nouns that fit the gap grammatically. Grammar gets you to the sentence; only meaning picks the word.
• The paraphrase-blindness trap. Scanning for the question's exact words fails when the passage paraphrases them. If your locator is "change of material," be ready to find "switch," "substitution," or "replaced."
• The order violation. If your answer to question 33 sits before your answer to 32 in the passage, one of them is wrong. The order rule is a free error-detector — use it.
• The spelling giveaway. You are copying from a visible text, so a misspelled answer is an unforced zero. Copy letter by letter for unfamiliar words.

How this differs from its neighbours

Sentence completion is the ordered, single-sentence member of the completion family. Summary, note and table completion work on the same copy-from-the-text rules but pull answers from a denser block of text, sometimes out of strict order within the summary. Matching sentence endings looks superficially similar — incomplete sentences again — but there you select endings from a list rather than copying words, which changes the strategy entirely. Knowing which rules apply to which type is worth marks on its own.

Practising it properly

Drill focused sets on our sentence completion practice hub, doing your first few untimed with the method above: predict the grammar, locate by stable keywords, verify by meaning, check the limit. Review every miss by naming its trap from the list — misses you can name stop repeating. Then mix the type back into full timed passages on the Reading practice pages, budgeting roughly a minute per question, and when you have a raw score out of 40, the band score calculator converts it so you can watch the recovered marks move your band. Sentence completion rewards discipline more than brilliance — which is exactly why it should become one of your reliable types.