Duolingo English Test Vocabulary: What to Expect

The Duolingo English Test, often shortened to DET, is taken online on your own computer, and it works differently from a fixed exam. It is a computer adaptive test, which means the difficulty of many questions changes depending on how you are doing. That has consequences for how to prepare. This guide uses Duolingo's own test handbook, a public document, to describe how the test is built. Details can change, so check the Duolingo site for current information before you register.

How the test is built

According to the handbook, you need about one hour of uninterrupted time. The test has three stages. The first, about five minutes, is introduction and onboarding: a tech check of your camera, speakers and microphone, a review of the rules, an identity check and setting up a second camera. The second, about 45 minutes, is the adaptive test. The third, about ten minutes, asks for a longer writing sample and a longer speaking sample.

A notable feature is that the adaptive stage is not divided into separate skill sections. You answer a series of different question types that, together, assess speaking, writing, reading and listening. The handbook marks which question types are adaptive, and in those the difficulty of what you see next changes with your performance. The handbook also says institutions that receive your results will receive your writing and speaking samples as examples of your English.

The question types

The handbook lists the question types in the order they appear, with how often each occurs. Early in the test you meet Read and Select, which is one set of 15 to 18 words. Then comes Fill in the Blanks, one set of 6 to 9 sentences. After that, in random order, come Read and Complete (3 to 6 passages), Read Aloud (3 to 6) and Listen and Type (6 to 9). Later come Interactive Reading and Interactive Listening, Write About the Photo, Interactive Writing, Listen Then Speak, Speak About the Photo and Read Then Speak, followed by the Writing Sample and the Speaking Sample.

Several of these test vocabulary directly, and it helps to know exactly how.

Read and Select. You see a series of words, one at a time, and decide whether each is a real English word. The handbook says you get 15 to 18 words in a row and five seconds for each. Some words look real but are invented, with small differences from real words, and the handbook advises selecting Yes only if you know and feel confident the word is real. It is scored right or wrong by an AI engine and affects the reading subscore.

Fill in the Blanks. The instruction is to complete the sentence with the correct word. You are working from context and from partly shown letters, so you need to know the word and how it is spelled.

Read and Complete. A short passage has its first and last sentences intact, and in the sentences between, some words are unfinished, with letters missing. You type the missing letters. The handbook gives 3 minutes for the task and says the passages include fiction, news articles and textbook passages.

Listen and Type. You hear a sentence and type it, which tests whether you can recognize spoken words and spell them.

The other tasks, such as Read Aloud, Write About the Photo and the interactive tasks, use vocabulary too, but in the way any speaking or writing task does, by asking you to find the words to say or write.

What this means for preparation

Breadth helps. Because tasks such as the real-word decision sample widely across vocabulary, knowing a broad range of words at several levels helps more than deep knowledge of one narrow topic. A learner who is solid across the middle levels is generally better placed than one who knows many advanced words with gaps beneath them.

Spelling counts. Fill in the Blanks, Read and Complete and Listen and Type all involve spelling words correctly, because you type them. Practice spelling by writing words from memory and checking them, not only by recognizing them on screen.

Recognition has to be quick. The real-word task gives five seconds a word. You need to know a word without working it out, and that comes from having met it several times, not from a single study session.

Be careful with guesses. The handbook's advice on the real-word task is to select Yes only when you are confident. In an adaptive test, the difficulty of later questions depends on earlier answers, so reliable knowledge is a safer base than hopeful guessing.

Hearing words matters. Listen and Type and Read Aloud both depend on how words sound. Listening to a word and then typing it from memory is good practice for the first, and saying words aloud is good practice for the second.

A preparation plan

Start by checking your range. A short placement quiz or a practice test shows which levels you are secure on. Then spend about fifteen minutes a day. For five minutes, review words from earlier days by typing them from their meanings, because that practices recall and spelling at once. For five minutes, learn five new words with an example sentence and say each aloud. For five minutes, practice listening: play a short sentence and type what you hear, then check your spelling.

Once a week, take a timed run of tasks like the ones above and see where you lose time or accuracy. The handbook points to a free practice test on the Duolingo site, which gives an unofficial score estimate and is taken in the full-test format, so it is a good way to get used to the timing.

How spaced repetition works explains why spreading your reviews across days helps, and active recall versus rereading explains why typing a word from memory is better than looking at it again.

Word parts and spelling patterns

Because many tasks ask you to complete or recognize words from partial information, knowing how words are built helps. If you know that -able and -ible both mean "capable of", that un- and dis- make negatives, and that -tion turns verbs into nouns, you can recognize and complete a surprising number of words you have not seen before. The -able and -ible guide and the guide to un-, dis- and in- are good places to start.

What the test will not tell you

A score on any test is a snapshot, and it is not the same as your ability in every situation. Different institutions use the DET in different ways, and some do not accept it at all, so confirm that the organization you are applying to takes it and which score it needs.

How Wordabulary fits in

Wordabulary can help with the vocabulary part. Its words are tagged from A1 to C2, so you can build breadth across levels, practice shows definitions and example sentences, quizzes include a typing format that asks you to produce words, and every word can be heard. It does not predict a DET score, and it has no connection with Duolingo. Use it alongside the practice test and your own speaking and writing practice.