Study · Academic reading skillsLesson 02
Understanding Main Ideas
Level B1–B2
Understanding Main Ideas
Learning goals
- In this lesson, you will learn to identify the main idea of a paragraph or passage, distinguish central ideas from supporting details, choose accurate summaries, and recognise common traps in multiple-choice questions.
Step 1 — Read and discover
Read the passage once. Focus on the topic, repeated ideas, and the writer's central message. Do not stop at every unfamiliar word.
Why Public Libraries Still Matter
Public libraries have changed considerably in recent years. In addition to lending books, many now provide internet access, quiet study areas, digital resources, and activities for local residents. These services are particularly useful for people who do not have reliable internet access or enough space to study at home.
Libraries can also support learning throughout life. Children may attend reading sessions, students can use reference materials, and adults can learn practical skills through workshops. Some libraries help visitors use online public services or search for employment. In this way, a library can serve people with different needs and levels of experience.
However, libraries need to respond to changes in their communities. A building with outdated equipment or limited opening hours may not meet local needs. Library staff can ask residents which services are most useful and use this feedback to plan improvements. Although libraries cannot solve every social problem, they can provide shared spaces and resources that many people would otherwise find difficult to access.
1. What is the passage mainly about?Try again
1. What is the passage mainly about?
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2. Which services are described as especially useful for people without reliable internet or study space at home?Try again
2. Which services are described as especially useful for people without reliable internet or study space at home?
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3. What does the writer suggest about libraries?Try again
3. What does the writer suggest about libraries?
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Step 2 — Understand main ideas
What is the main idea?
The main idea is the central point a writer wants readers to understand. It is broader than one fact or example, but more specific than a general topic.
- Topic: urban parks
- Main idea: Urban parks can improve city life by supporting health, social contact, and environmental quality.
- Supporting detail: A park may give residents a safe place to walk or exercise.
A paragraph may state its main idea near the beginning, near the end, or across several sentences. Sometimes you need to combine information from the whole paragraph.
Find the main idea
Ask yourself three questions:
1. What is the passage mainly about? Identify the general subject.
2. What does the writer want me to understand about it? Look for the central message, not just the subject.
3. Which details support that message? Examples should fit the main idea without replacing it.
For the library passage above:
- Topic: public libraries
- Main idea: Public libraries remain valuable because they offer a range of learning resources and community services, but they need to respond to local needs.
- Supporting details: internet access, reading sessions, workshops, and help with online services.
Main idea or supporting detail?
A main idea brings several details together. A supporting detail gives one example, fact, reason, or explanation.
- Main idea: Libraries offer services that support different members of the community.
- Detail: Some libraries organise reading sessions for children.
- Detail: Some libraries help visitors search for employment.
The details support the main idea, but neither detail represents the whole paragraph.
A reliable strategy
1. Read the paragraph once without stopping at every unfamiliar word.
2. Notice repeated ideas and words connected by meaning.
3. Ask what the examples have in common.
4. Say the central message in your own words in one sentence.
5. Compare your sentence with the answer options.
6. Reject options that are too narrow, too broad, or not supported by the passage.
Strategy guide
Main idea
State the central message the writer wants readers to understand.
- Identify the general topic first.
- Ask what the writer says about that topic.
- Notice repeated ideas and what examples have in common.
- Express the message in one sentence before looking at options.
Example: Public libraries remain valuable because they offer learning resources and community services.
Common mistake: Choosing a true detail that only fits one sentence instead of the whole paragraph.
Supporting detail
Give one example, fact, reason, or explanation that backs the main idea.
- Check whether the statement covers the whole paragraph or one point.
- See whether other details depend on this idea.
- Reject options that list a single example when the question asks for the main idea.
Example: Some libraries organise reading sessions for children.
Common mistake: Treating any true sentence from the passage as the main idea.
Summary choice
Pick an option that paraphrases the passage without adding or distorting information.
- Reject answers that are too narrow or too broad.
- Watch for extreme words such as always, only, or never unless the text supports them.
- Prefer options that balance benefits and limits when the writer includes both.
Example: Online learning offers flexibility, but organisation and support also matter.
Common mistake: Selecting an option that sounds reasonable but is not supported by the text.
Step 3 — Main idea or supporting detail?
Choose the best answer, then check your choices.
1. Urban trees can improve the quality of life in cities.Try again
1. Urban trees can improve the quality of life in cities.
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2. Trees can provide shade on hot days.Try again
2. Trees can provide shade on hot days.
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3. Some trees reduce the amount of rainwater that reaches the ground quickly.Try again
3. Some trees reduce the amount of rainwater that reaches the ground quickly.
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4. Public transport can make travel easier for people who do not own cars.Try again
4. Public transport can make travel easier for people who do not own cars.
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5. One bus route connects the station to the university.Try again
5. One bus route connects the station to the university.
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6. Libraries need to respond to changes in their communities.Try again
6. Libraries need to respond to changes in their communities.
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Step 4 — Practise with a short text
Read the text below. Identify the main idea and supporting details, then answer the questions.
Community gardens and local cooperation
Community gardens give residents a place to grow vegetables, share knowledge, and spend time outdoors. They may also help people who live in flats with little or no private outdoor space. Working together in a garden can encourage neighbours to meet and cooperate. However, these projects need access to land, water, tools, and volunteers. A garden is more likely to continue when responsibilities are shared and the local community supports it.
1. What is the passage mainly about?Try again
1. What is the passage mainly about?
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2. Which statement is a supporting detail rather than the main idea?Try again
2. Which statement is a supporting detail rather than the main idea?
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3. What makes a garden more likely to continue?Try again
3. What makes a garden more likely to continue?
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4. Who might benefit especially from a community garden?Try again
4. Who might benefit especially from a community garden?
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5. Which title best summarises the passage?Try again
5. Which title best summarises the passage?
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Step 5 — Choose the best summary
Read each paragraph quickly, then choose the best summary.
1. Many people use short breaks during the day to check messages or watch videos. These activities can be enjoyable, but they do not always help people feel rested. A brief walk, a conversation, or a few minutes away from a screen may help someone return to a task with better concentration. The most useful break often depends on the person and the kind of work they are doing.Try again
1. Many people use short breaks during the day to check messages or watch videos. These activities can be enjoyable, but they do not always help people feel rested. A brief walk, a conversation, or a few minutes away from a screen may help someone return to a task with better concentration. The most useful break often depends on the person and the kind of work they are doing.
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2. Online courses allow learners to study at different times and from different locations. Recorded lessons can be replayed, and digital materials are often easy to access. However, online learning also requires learners to manage their time and stay motivated. Some students benefit from regular feedback and contact with a teacher or classmates. For this reason, successful online learning depends not only on the technology but also on how the course is organised and supported.Try again
2. Online courses allow learners to study at different times and from different locations. Recorded lessons can be replayed, and digital materials are often easy to access. However, online learning also requires learners to manage their time and stay motivated. Some students benefit from regular feedback and contact with a teacher or classmates. For this reason, successful online learning depends not only on the technology but also on how the course is organised and supported.
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3. Cities are increasingly planting trees as part of plans to make urban life healthier. Trees provide shade and can make public spaces more pleasant, but successful planting requires suitable locations, water, and community involvement. Urban tree planting is not a complete solution to heat or pollution, yet careful selection and maintenance can make cities more liveable.Try again
3. Cities are increasingly planting trees as part of plans to make urban life healthier. Trees provide shade and can make public spaces more pleasant, but successful planting requires suitable locations, water, and community involvement. Urban tree planting is not a complete solution to heat or pollution, yet careful selection and maintenance can make cities more liveable.
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Step 6 — Quick review
Choose the best answer for each question.
1. The main idea of a paragraph is:Try again
1. The main idea of a paragraph is:
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2. A supporting detail:Try again
2. A supporting detail:
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3. Which answer choice is often a trap in main-idea questions?Try again
3. Which answer choice is often a trap in main-idea questions?
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4. When choosing a summary, you should reject options that:Try again
4. When choosing a summary, you should reject options that:
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5. What should you do after stating the main idea in your own words?Try again
5. What should you do after stating the main idea in your own words?
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