DET Listen and Complete: Grammar, Meaning, and Collocation

Scenario audio: A student says the biology laboratory is unavailable on Tuesday, so the class will meet in Room 204 on Wednesday.

Question: “The class will meet in ______.”

Room 204 on Wednesday is supported. The biology laboratory on Wednesday sounds like a complete location-and-time phrase, but it contradicts the recording. Natural grammar cannot rescue an answer whose content is wrong.

That is the narrow decision in the current Duolingo English Test Listen and Complete task: complete an answer by combining scenario evidence with the grammar and collocation around the blank, without adding merely plausible information.

Since the expanded Interactive Listening format began in July 2025, you first hear a scenario and answer three or four fill-in-the-blank questions about it. The scenario audio can be replayed, including later during Listen and Respond. Duolingo’s official update also says answers may paraphrase; they do not have to reproduce the audio word for word. This is not a transcript-reconstruction task.

For choosing a conversational reply, use DET Interactive Listening: choose by speaker intent. Continue through the DET vocabulary practice hub and Exam English hub. Every scenario and question below is original practice.

Three checks, one evidence boundary

Use three checks for each blank:

1. Grammar: What form completes the sentence?
2. Semantic fit: Which fact from the scenario answers this exact question?
3. Collocation: Which words combine naturally in the completed answer?

These checks work together, but the audio sets the evidence boundary. You may paraphrase a stated fact. You may not supply a reasonable cause, location, or outcome that the scenario never gave.

Suppose the audio says a tutor moved office hours because she must attend a faculty meeting. “The tutor moved office hours because of a faculty meeting” is a faithful paraphrase. “Because of a scheduling conflict” may preserve the core meaning at a more general level. “Because of a medical appointment” is plausible but unsupported.

Grammar defines the answer shape

The visible sentence tells you what kind of language can fit.

The students requested an ______ of the deadline.

After an and before of, a singular noun fits: extension.

The instructor agreed to ______ the deadline.

After to, a base-form verb fits: extend.

If the scenario states that the instructor added two days, the related forms express the same event through different grammar. Paraphrase does not mean ignoring the frame; an extend of the deadline and to extension the deadline fail grammatically.

Before replaying, identify the slot: noun phrase, base verb, gerund, adjective, prepositional phrase, reason, person, place, or time. Predict the category, not the specific fact.

Meaning selects the correct scenario fact

One scenario can contain several nearby facts:

• the original meeting was Tuesday;
• the new meeting is Wednesday;
• the room is 204;
• the change happened because the laboratory is unavailable.

Each question targets one relation.

The meeting was moved because ______.

Answer: the laboratory is unavailable.

The meeting will now take place ______.

Answer: on Wednesday in Room 204.

Do not place the original time in the new-time answer or the consequence in the reason blank. Keyword overlap is insufficient; assign each fact its role.

Collocation supports accurate paraphrase

Collocations are conventional word partnerships. They let you express a heard idea compactly:

• meet a deadline;
• request an extension;
• raise a concern;
• reach a compromise;
• reserve a room;
• submit a form;
• conduct a survey;
• available for consultation.

Scenario fact: Priya asked for two more days to finish a report.

Possible answers:

• “Priya requested an extension.”
• “Priya asked for more time.”

Both can preserve the fact. “Priya missed the deadline” does not: requesting more time is not the same as failing to submit.

Collocation improves expression only after meaning is established. Do not hear deadline and automatically write missed the deadline.

Prepositions preserve relationships

Short prepositions can distinguish different facts:

• apply for a scholarship;
• apply to a university;
• meet with an adviser;
• meet at the library;
• responsible for the equipment;
• familiar with the procedure;
• an increase in attendance;
• an increase of twelve students.

Scenario: Elena applied to North College for a travel scholarship.

Elena applied ______ for funding.

to North College fits the institution relationship.

Elena applied for ______.

a travel scholarship fits the thing requested.

The nouns appear in one scenario, but the grammatical frame decides which relationship the answer must express.

Do not confuse state, action, and result

Academic scenarios often present a problem, response, and outcome.

Audio facts:

1. The first survey had very few responses.
2. The group shortened the survey.
3. More students completed the revised version.

Question: “The group shortened the survey because ______.”

Answer: the first version received very few responses. That is the motivating problem.

Question: “After the survey was shortened, ______.”

Answer: more students completed it. That is the result.

“To make it easier” may be a reasonable inferred purpose, but if the recording only states low response numbers, the safest answer uses that stated evidence.

Worked scenario

Read this written stand-in for scenario audio once, cover it, and answer the questions. Then uncover it to replay.

Maya and Tomas are organizing a campus clothing exchange. They originally reserved the student center for Friday afternoon, but a maintenance inspection will close the building that day. Maya has found an available room in the library for Saturday morning. It is smaller, so Tomas suggests limiting each participant to ten items. They agree that Maya will confirm the library room, while Tomas will update the event notice by Wednesday.

Question 1

The original venue is unavailable because of ______.

Answer: a maintenance inspection. Grammar calls for a noun phrase after because of. The closure is a consequence; the inspection is the stated reason.

Question 2

The exchange may be moved to ______.

Answer: a library room on Saturday morning. The answer supplies both new place and time. “The student center on Friday” gives the original arrangement.

Question 3

Tomas proposes that participants ______.

Answer: bring no more than ten items. This paraphrases limiting each participant to ten items. The modal-like frame proposes that participants takes a base verb.

Question 4

By Wednesday, Tomas will ______.

Answer: update the event notice. Maya, not Tomas, confirms the room. Matching the person is part of semantic fit.

Controlled practice 1: grammar and family choice

Scenario facts: The professor granted Lina three extra days after Lina requested more time for the assignment.

1. “Lina requested an ______.” extension. A noun follows an.
2. “The professor agreed to ______ the deadline.” extend. A base verb follows to.
3. “The deadline was ______ by three days.” extended. Passive was requires a past participle.
4. “Lina received three ______ days.” additional or extra. Both faithfully express the stated amount.

The exercise accepts equivalent wording where the meaning and grammar remain intact.

Controlled practice 2: collocation and evidence

Scenario: A research group planned to interview fifty people. Only thirty volunteered, so the group extended recruitment for one week. It did not change the interview questions.

Choose the supported completion.

1. “The group did not ______ its recruitment target.”

   • A. meet
   • B. conduct

   Answer: A. Meet a target is the natural collocation, and thirty is below fifty.

2. “Recruitment was extended because ______.”

   • A. too few people had volunteered
   • B. the questions were confusing

   Answer: A. B invents a problem; the scenario gives low volunteer numbers as the reason.

3. “The group allowed ______ for recruitment.”

   • A. an additional week
   • B. an additional fifty people

   Answer: A. The scenario extends time, not the target by fifty.

Controlled practice 3: role tracking

Scenario: Chen will collect the signed forms. Aisha will reserve the recording equipment. Omar will send the timetable after Aisha confirms the reservation.

1. Who handles consent documents? Chen.
2. What is Aisha responsible for? Reserving the recording equipment.
3. What must happen before Omar sends the timetable? Aisha must confirm the reservation.
4. Does the scenario say who will operate the equipment? No. Assigning that role would invent content.

Names, tasks, and sequence form a three-column mental ledger. Similar academic vocabulary can otherwise cause role swaps.

Paraphrase without expanding the claim

Faithful compression:

• “the room had already been booked” → “a scheduling conflict”;
• “the bus arrives after the seminar begins” → “the bus arrives too late”;
• “participants found the instructions difficult to follow” → “the instructions were unclear to participants.”

Unsafe expansion:

• “the room had already been booked” → “the administrator made an error”;
• “the bus arrives too late” → “public transport is unreliable”;
• “instructions were unclear” → “the project was badly designed.”

The unsafe versions add blame or general conclusions. Good paraphrase changes form while preserving scope.

A replay routine

1. Read the incomplete question and identify the requested relation.
2. Replay the scenario with a narrow target: person, cause, time, place, action, or result.
3. Record only the relevant fact in simple words.
4. Fit that fact grammatically into the sentence.
5. Use a natural collocation where it preserves the meaning.
6. Check actor, time, negation, quantity, and sequence.
7. Remove extra information that does not answer the blank.

Duolingo’s official update says the scenario can be replayed without a fixed replay count, while the shared section timer continues. Use replay to verify evidence, not to search for a preferred phrase.

Common mistakes

• Treating the task as word-for-word dictation.
• Predicting a full answer before listening.
• Choosing the right topic but the wrong role, time, or causal relation.
• Using a familiar collocation that the scenario does not support.
• Adding a plausible purpose, emotion, or blame.
• Copying too much information into a narrow blank.
• Forgetting that the grammatical frame may require a different member of a word family.
• Swapping responsibilities among speakers.

Final practice

Scenario:

Nia’s group must present on Monday. Their data chart is complete, but two labels are difficult to read. Nia will enlarge the labels tonight. Luis will check the revised chart tomorrow morning, and only then will Farah upload the slides.

Complete:

1. The group is scheduled to present on Monday.
2. Nia will improve the chart by enlarging two labels.
3. Before the slides are uploaded, Luis must check the revised chart.
4. The person responsible for uploading the slides is Farah.

“The data are incomplete” is not an acceptable explanation: the scenario says the chart is complete and identifies legibility as the problem.

For fresh listening and vocabulary practice, try Lyra Practice.

Sources

• Expanded Interactive Listening update — Duolingo English Test Help Center
• Interactive Listening on the Duolingo English Test
• Test Structure — Duolingo English Test Help Center

Related

• DET Interactive Listening: choose by speaker intent
• DET Interactive Listening: summarize the conversation
• DET Listen and Type vocabulary and spelling
• DET Interactive Speaking follow-up answers

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