How do I follow the main idea in a lecture?
Spot the signal words that separate examples from main reasons and results.
2 min read · Updated 9/8/2026
The key idea
In a long monologue, don't try to write down every word. Follow how the speaker builds the idea: first, another reason, for example, as a result, to sum up.
When for example comes, an example of the previous idea begins. Another reason introduces a new reason. This difference helps you avoid mixing up your notes.
In your notes you can write the key noun and the link instead of a long sentence: “less traffic → quicker journeys”.
See an example
Example: Trees help cities in several ways. First, they provide shade. For example, a tree-lined street can be more comfortable to walk along in summer. Another benefit is their role in supporting wildlife.
The main ideas are shade and support for wildlife. Walking along a street in summer is an example of the first idea.
Now you try
Listening practice
Computer narration for practice. Listen first, then open the transcript.
Listen to the audio. Which two benefits are mentioned?
A. Lower energy use B. More space for parking C. Less noise inside buildings D. Faster construction
Choose two letters, and notice the example that comes in between.
A personal draft. It is not saved when you leave or automatically graded.
Show transcript
Show transcript
Insulation has two important benefits. First, it can reduce energy use. For example, a well insulated home stays warmer in winter. Another benefit is that it can reduce noise inside the building.
Reveal the answer and explanation
Answer and explanation
A and C. The speaker mentions that insulation reduces energy use and cuts noise inside the building.
A home staying warmer in winter is an example of the first benefit. There is no need to count it as a third, separate main idea. No information is given about parking space or construction speed.
I missed an answer: what do I do now?
Official sources for this topic
IELTS · Listening