Duolingo Complete the Sentence: how it works, scoring and practice
A sentence appears with one or more blanks, and for each blank you choose the word that completes it best. The wrong options are rarely absurd — they are usually near-misses: a wrong form of the right word, or a word from the right topic with the wrong meaning — so the task tests precise vocabulary and grammar together.
How the adaptive scoring treats Complete the Sentence
Complete the Sentence is machine-scored on your choices, and like all graded DET tasks it feeds the adaptive engine — accurate answers pull harder, higher-value items toward you on the 10–160 scale, and it contributes on the reading side alongside the Literacy and Comprehension subscores. Because the distractors are built around form and collocation errors, the score separates people who know a word from people who know how the word behaves in a sentence.
Adaptive-test reality check: the DET has no back button and every task runs on its own timer, so a method you can execute without deliberation is worth more than a clever one you have to think about. Drill the mechanic until it is automatic — practice results here are task-level feedback, not a prediction of your official 10–160 score.
A three-step method that survives the timer
- Step 1. Read the complete sentence first and predict the missing word before looking at the options — a confident prediction turns the choices into a confirmation, not a debate.
- Step 2. Check each candidate against the grammar around the blank: number agreement, verb form, and the article or preposition it must live with eliminate most near-miss distractors.
- Step 3. Confirm the collocation. English pairs words habitually — you “put a novel down”, you “fry onions until golden” — and the best answer is the one a fluent writer would actually choose, not merely a defensible one.
Three mistakes that cost points
- Choosing a word from the right topic with the wrong meaning, because it “sounds related” to the sentence.
- Missing a form error — the plural where the article demands a singular, the past tense after “to” — that disqualifies an otherwise sensible word.
- Overthinking a clean answer until the timer forces a rushed change. Your grammar-checked first choice is usually right; this task punishes dithering more than it rewards re-analysis.
See the method on a fresh task
Prompt: “She stayed up late because she couldn’t put the ___ down until she reached the last page.” Options: novel / noun / novels.
Approach: Predict first: something you read and cannot put down is a book. “Novel” fits meaning, the singular agrees with “the” and “it”, and “put the novel down” is the natural collocation. “Noun” is the sound-alike trap with the wrong meaning; “novels” fails agreement. Choose “novel” and move on — the reasoning should take seconds, not the whole timer.
This example is original to TestDayTwin — the real DET draws adaptively from its own item pool, so no genuine test question appears here.
Open Complete the Sentence practice
Our DET drills run free in your browser under realistic timing. Objective tasks score instantly; speaking and writing use honest record-and-review feedback, and recordings stay on your device.
Questions learners ask
How does Complete the Sentence work on the Duolingo English Test?
You read a sentence with one or more blanks and pick the best word for each from a short set of options, inside the task’s own timer. The distractors are typically near-misses — wrong forms or wrong-meaning look-alikes — so grammar and collocation decide, not topic association.
What is the best strategy for Duolingo Complete the Sentence?
Predict the word before reading the options, then verify grammar (agreement, tense, articles) and collocation. Prediction-first is faster and more accurate than testing each option against the sentence, and speed matters because every DET task is individually timed with no going back.
How is Complete the Sentence different from Read and Complete?
Read and Complete gives you a damaged passage and you type the missing letters — spelling is scored. Complete the Sentence gives you options to choose from — judgement is scored, spelling is not. They reward the same underlying reading knowledge from two directions, which is why drilling both together works well.
Related Duolingo task guides
Task behaviour, the 10–160 score scale and the integrated subscores follow Duolingo's official test pages as verified for our DET format guide (July 2026). The DET is adaptive, so the exact mix, order and difficulty of tasks varies per sitting — Duolingo controls the test and the scoring. TestDayTwin is an independent practice site.