Lesson 21 of 41 in the Test Ninjas TOEFL course: Listen to an Academic Talk, Listening. In Listen to an Academic Talk, a professor gives a short talk, usually a minute or two long, and you hear it once.
Test Ninjas Research · Updated October 1, 2026
Lesson at a glance
Detail
This lesson
Module
Listen to an Academic Talk (Listening)
English focus
Lecture signposting: signal phrases that open the topic, move to a new part, introduce an example, mark the key point, restate it, and point to what comes next (let's turn to, what this means is, the key point)
Task skill
Main idea (the question the talk keeps answering, not its most vivid example); what the professor will discuss next (the last signal phrase)
Time
About 55 minutes
Access
Included in the TOEFL plan
What this lesson teaches
In Listen to an Academic Talk, a professor gives a short talk, usually a minute or two long, and you hear it once.
This lesson teaches the English that gives a lecture its shape. Signal phrases do seven jobs:
- open the topic (Today I want to look at…)
- move on (Let’s turn to…)
- bring in a case (Say…, Take…)
- mark the key point (The key point is…)
- restate it (In other words…)
- add a catch (The catch is…)
- point ahead (That’s our question for Wednesday)
Then you’ll use them for the two questions they unlock most directly: what the talk is mainly about, and what the professor will discuss next.
By the end of the lesson, you can
Recognize and use the signal phrases that structure a talk: opening the topic (Today I want to look at…), moving on (Let’s turn to…, Now take…, So much for…), introducing a case (Say you’ve got…, Take…) and pointing ahead (That’s our question for Wednesday).
Recognize the phrases that mark what matters (The key point is…, The thing to remember is…), restate it (What this means is…, In other words…), add a complication (The catch is…) and pose a question the professor will answer herself (So how does that work?).
Take signal-phrase notes on a short talk, choose the main idea (the question the talk keeps answering) over a vivid example or the opening background, and choose what comes next from the last signal phrase.
What’s inside
Around the 3 teaching cycles below, the lesson opens with a quick check and closes with applied practice, a Check and a debrief. How every course lesson is built.
Teaching cycles in lesson 21
Cycle
Focus
What it teaches
Drills
Cycle 1
English
Signal phrases that open, move on and point ahead
6
Cycle 2
English
Signal phrases for the key point, the restatement and the catch
6
Cycle 3
Task skill
Main idea and what comes next
6
Word bank
The 10 words and phrases this lesson teaches. They come from the real course questions you practice on in the Apply step, so you meet each one again in context.
excavation noun
the act of digging, especially to find old objects or build something
Excavation work for the new subway line closed two lanes of the avenue for a year.
Goes with:
carry out an excavation; excavation work
Word family:
excavate (verb); excavator (noun): a large digging machine
unnoticed adjective
not seen or noticed by anyone
A small typo in the title went unnoticed until all the posters were printed.
a small amount of water in the air or in something
Keep the bread in a sealed bag so it doesn’t lose its moisture.
Goes with:
absorb / hold / retain moisture
Word family:
moist (adjective); moisturize (verb); moisturizer (noun): a skin cream
contrast noun / verb
a clear difference between two things
The bright red door makes a sharp contrast with the gray walls around it.
Goes with:
a sharp contrast; contrast X with Y
Word family:
contrasting (adjective); in contrast / by contrast (phrases); stress: CONtrast (noun), conTRAST (verb)
drought noun
a long time with little or no rain
During the drought, the town asked people not to water their lawns.
Goes with:
a long / severe drought; in a drought
Word family:
dry (adjective); drought-resistant (adjective); say it /draʊt/: it rhymes with out
turn up phrasal verb
to find or uncover something, often unexpectedly; also, to be found
The lost keys turned up in the pocket of an old coat.
Goes with:
a search turns up evidence; turn up late
Word family:
turns up / turned up; meaning 1: find or uncover, or be found (a search turned up new evidence; the keys turned up); meaning 2: arrive (she turned up late)
retain verb
to keep or continue to have something
A good thermos retains heat for hours, so your tea stays hot all morning.
Goes with:
retain heat / water / information
Word family:
retention (noun); retains / retained
reveal verb
to show something that was hidden
The survey revealed a clear pattern: most students study late at night.
Goes with:
reveal a pattern; reveal itself
Word family:
revelation (noun); revealing (adjective)
gradually adverb
slowly, over a period of time
The lake gradually freezes from the edges toward the middle.
Goes with:
gradually fill / cool / increase
Word family:
gradual (adjective); a gradual change / gradually change
detectable adjective
able to be noticed or measured
The gas has no smell, so a small leak is barely detectable without a sensor.
Goes with:
barely / easily detectable
Word family:
detect (verb); detection (noun); detector (noun)
The takeaway: Signal phrases are the lecture’s map: the opening frame names the main idea, and the last forward-pointing line tells you what comes next.
In the full course
Main idea and how a lecture is organized is part of the full TOEFL course
Unlock all 41 lessons with the TOEFL plan, or try one of the free lessons first.
✓All 3 teaching cycles of this lesson, with 18 drills and feedback on every answer
✓The 10-word bank, each word with a recall drill
✓A walk-through, guided practice and a Check on Listen to an Academic Talk