Lesson 10 of 46 · Reading Comprehension
Main idea, primary purpose and the author’s attitude
State a passage’s main idea in one sentence, match purpose choices verb first, and rule out choices that are too broad, too narrow or off in tone.
About 18 minutes
In this lesson
- Tell the topic, the main idea and the primary purpose of a passage apart.
- Choose a primary-purpose answer by testing its verb against the author’s stance, then its object against the whole passage.
- Recognise choices that are too broad, too narrow, distorted or wrong in tone.
The idea
Three things that are easy to confuse
Questions about the passage as a whole come in a few wordings: "the main idea", "the primary purpose", "which title best fits", "the author's attitude". They ask for different things, and mixing them up is a common way to pick a choice that is true but not what was asked.
| Term | What it is | Example (a passage about independent bookshops) |
|---|---|---|
| Topic | what the passage is about | independent bookshops |
| Main idea | what the author says about the topic, in one sentence | independent bookshops survive by selling judgement rather than low prices, but only if they have judgement to sell |
| Primary purpose | what the author is doing | to offer, and then limit, an explanation for something a standard prediction did not expect |
Find the main idea from your map
The main idea is not usually the first sentence. In a passage that reports a view and then turns against it, the main idea sits after the turn. In a passage that proposes something and then limits it, the main idea includes the limit.
Write it as one sentence that the whole passage serves. Then test it: does every paragraph (or every stage of a one-paragraph passage) support, illustrate or qualify that sentence? If one stage is left over, the sentence is too narrow. If the sentence says more than any stage supports, it is too broad.
Purpose choices: test the verb, then the object
Primary-purpose choices are almost always a verb and an object: "to challenge a common assumption about…", "to describe two approaches to…". Test the verb first, because it carries the author's stance, and a wrong stance rules a choice out at once.
| Verb family | Fits a passage where the author… |
|---|---|
| describe, outline, discuss, present | reports without taking a side |
| explain, account for | gives the causes of something |
| argue, defend, advocate | takes a side and supports it |
| challenge, question, dispute, refute | argues against a view ("refute" means show it false, which is strong) |
| qualify, refine, limit | accepts a view in part and narrows it |
| compare, contrast, evaluate | weighs two or more things |
A passage that lays out a debate even-handedly cannot have the purpose "to argue that one side is right". A passage that refines a view cannot have the purpose "to refute" it. Only after the verb survives should you check the object: is it the whole passage's subject, or only one paragraph's?
The four ways a choice goes wrong
- Too narrow: it describes one paragraph or one example correctly but leaves out the rest. These are the hardest to reject, because everything in them is true.
- Too broad: it claims more than the passage covers ("the history of restoration" for a passage about one decision in restoration).
- Distorted: it uses the passage's own words but changes their relationship, for instance turning a cause into an effect, or one side's claim into the author's.
- Wrong stance or tone: the verb or an adjective is stronger or weaker than the author's position.
Tone and attitude
The author's attitude shows in a few places: evaluative adjectives ("trivial", "apt", "honest"), hedges ("seems", "may", "suggests"), concessions ("admittedly"), and the way the last sentence lands. Academic writing is usually measured, so extreme attitude words ("contemptuous", "ecstatic", "outraged") rarely fit. A passage that presents two sides and then points out what they share is even-handed, even if it gives one side more space.
The same method for one paragraph
"The second paragraph primarily serves to…" is a purpose question on a smaller scale. Use the paragraph's line in your map, test the verb, and make sure the object is about that paragraph's job in the whole passage, not about some detail inside it.
Worked examples
Example 1: Stating the main idea
Economists who study retail often predict that small, independent shops cannot survive competition from large chains and online sellers, since the larger firms buy in bulk and so can charge less. In many towns, though, independent bookshops have proved more durable than this reasoning allows. One explanation is that such shops do not mainly sell books at all, at least not in the sense that a warehouse does. What they offer is selection: a buyer who trusts a shop's choices saves the time of sorting through thousands of titles alone. On this view the independent shop competes on judgement rather than on price, and the price advantage of large sellers matters less than the prediction assumes. The explanation has limits. It works for shops whose staff have a recognisable taste; a small shop that stocks the same best-sellers as everyone else has no judgement to sell, and such shops appear to be the ones that have struggled most.
State the main idea of this passage in one sentence.
Map the stages. A prediction (independent shops cannot survive because big sellers are cheaper); a turn, "though" (independent bookshops have proved durable); an explanation (they sell selection, so they compete on judgement); a limit (it works only for shops with a recognisable taste).
Find the author's position. The author offers the explanation ("One explanation is…", "On this view…") and then limits it ("The explanation has limits"). Both belong in the main idea.
Draft the sentence and test it against each stage: "Independent bookshops can outlast cheaper rivals by selling trusted judgement rather than low prices, but only when they actually have a distinctive selection." The prediction is what this answers, the explanation is its core, and the limit is its second half. Nothing is left over.
Answer
Main idea: independent bookshops can survive cheaper competitors by selling judgement rather than price, an explanation that holds only for shops with a distinctive selection. The tempting answer "small shops cannot compete with large sellers on price" is the prediction the passage pushes against, not its point.
Example 2: Choosing a primary purpose, verb first
For the bookshop passage above, which of these best states the primary purpose?
- to argue that economists' predictions about retail are generally unreliable
- to describe how independent bookshops choose which titles to stock
- to propose an explanation for an outcome a common prediction did not expect, and to note where that explanation stops applying
- to defend large online sellers against the charge of unfair competition
- to compare the prices charged by independent and chain bookshops
Test the verbs. The author offers an explanation and then limits it, without attacking anyone. "Argue that… generally unreliable" is far stronger than the passage, which questions one prediction about one kind of shop. "Defend" takes a side the passage never takes.
Test the objects of what remains. "Describe how bookshops choose titles" is too narrow and not even in the passage: it says shops sell judgement, not how they exercise it. "Compare the prices" picks up one premise (big sellers charge less) and nothing else.
The remaining choice, "to propose an explanation… and to note where that explanation stops applying", covers the prediction, the explanation and the limit, with a verb that matches the author's stance.
Answer
The third choice: to propose an explanation for an unexpected outcome and to note its limits. The most tempting wrong choice is the first, because the passage does push against an economists' prediction; but it questions one prediction, not economists' predictions in general.
Common traps
The true but narrow choice
A choice that accurately describes one paragraph feels safe because nothing in it is false. Ask whether it covers the whole passage. If a stage of your map is missing from it, it describes a part, not the purpose.
The verb that is too strong
"Refute", "dismiss" and "prove" claim more than most passages do. If the author concedes anything, hedges ("seems", "may"), or keeps part of the view under discussion, a strong verb is wrong however well its object fits.
Giving one side’s view to the author
In a passage that reports a debate, each side's claims are in the text, so a choice that states one of them looks supported. Check who says it. If the author only reports it, the choice is not the main idea.
Reading tone from the topic
A passage about a disaster is not therefore "alarmed", and a passage about art is not therefore "admiring". Tone comes from the author's words about the subject, not from the subject.
Check yourself
Answer each question before you open its answer.
Question 1: Primary purpose
Reading Comprehension
When a painting's varnish yellows, restorers face a choice that is as much philosophical as technical. Removing the old varnish reveals colours close to those the painter applied, and for most of the last century this was regarded as the only honest course. A growing number of conservators now argue for restraint. They point out that pigments themselves change with age: some blues darken and some reds fade, so that a fully cleaned canvas may show not the painter's intended harmony but a new imbalance that no one chose. A thin layer of toned varnish, they suggest, can keep the faded and the darkened colours in something like their intended relation. Critics answer that such toning replaces the painter's judgement with the restorer's guess. The two sides agree on more than their dispute suggests, however: neither claims that any surface visible today is the one the painter saw.
The primary purpose of the passage is to
- A.argue that old varnish should never be removed from paintings
- B.explain the chemical reasons that varnish yellows with age
- C.trace the history of painting restoration over the last century
- D.defend the conservators who favour restraint against their critics
- E.present a disagreement about cleaning paintings and point out an assumption both sides share
Show the answer
Answer: E. present a disagreement about cleaning paintings and point out an assumption both sides share
Working
The map: the choice restorers face; the older view (remove all varnish); the restraint view (pigments change, so toned varnish keeps their relation); the critics' reply; then "however", what both sides agree on. The author takes no side, so the verb must be neutral ("present"), and the object must include the shared assumption that the last sentence adds. Only the choice that presents the disagreement and the shared assumption fits both tests.
Why the other options are wrong
- A. The author reports the case for restraint but does not adopt it, and even the restraint camp proposes only a thin layer of toned varnish, not a rule that old varnish should never be removed.
- B. Yellowing is the starting point, but its causes are never discussed.
- C. Too broad. The last century is mentioned once, as the period when full cleaning was the norm; the passage is about one decision, not a history.
- D. The critics' objection is given without rebuttal, and the final sentence finds common ground; the author defends neither side.
What carries over
When a passage ends by finding common ground between two sides, the purpose includes that common ground and the verb stays neutral.
Question 2: Main idea
Reading Comprehension
When a painting's varnish yellows, restorers face a choice that is as much philosophical as technical. Removing the old varnish reveals colours close to those the painter applied, and for most of the last century this was regarded as the only honest course. A growing number of conservators now argue for restraint. They point out that pigments themselves change with age: some blues darken and some reds fade, so that a fully cleaned canvas may show not the painter's intended harmony but a new imbalance that no one chose. A thin layer of toned varnish, they suggest, can keep the faded and the darkened colours in something like their intended relation. Critics answer that such toning replaces the painter's judgement with the restorer's guess. The two sides agree on more than their dispute suggests, however: neither claims that any surface visible today is the one the painter saw.
Which of the following best states the main idea of the passage?
- A.A fully cleaned painting shows the colours its painter intended.
- B.Restorers have stopped removing yellowed varnish from paintings.
- C.The dispute over varnish is a dispute about how best to approximate an original appearance that both sides accept can no longer be seen.
- D.Toned varnish is the most reliable way to preserve a painting’s colours.
- E.Pigments that darken with age are more common than pigments that fade.
Show the answer
Answer: C. The dispute over varnish is a dispute about how best to approximate an original appearance that both sides accept can no longer be seen.
Working
Both positions aim at the painter's intended appearance by different means: full cleaning shows the original pigments, toning tries to keep their original relation. The final sentence adds that neither side thinks today's surface is the one the painter saw. The main idea joins these: the dispute is about how best to approximate an appearance both sides agree is lost.
Why the other options are wrong
- A. The restraint camp denies this, since pigments change with age, and the last sentence says that neither side claims any surface visible today is the one the painter saw.
- B. "A growing number" of conservators favour restraint; that is not all restorers, and the passage does not say the practice has stopped.
- D. This is one side's claim, and the passage reports the critics' objection to it without settling the matter.
- E. The passage says some blues darken and some reds fade; it compares neither their frequency nor their importance.
What carries over
A main idea must cover the passage’s last move as well as its first; check that your choice includes the turn at the end.
Question 3: The author’s attitude
Reading Comprehension
When a painting's varnish yellows, restorers face a choice that is as much philosophical as technical. Removing the old varnish reveals colours close to those the painter applied, and for most of the last century this was regarded as the only honest course. A growing number of conservators now argue for restraint. They point out that pigments themselves change with age: some blues darken and some reds fade, so that a fully cleaned canvas may show not the painter's intended harmony but a new imbalance that no one chose. A thin layer of toned varnish, they suggest, can keep the faded and the darkened colours in something like their intended relation. Critics answer that such toning replaces the painter's judgement with the restorer's guess. The two sides agree on more than their dispute suggests, however: neither claims that any surface visible today is the one the painter saw.
The author's attitude towards the two positions on varnish is best described as
- A.dismissive of both
- B.strongly in favour of restraint
- C.sceptical of the critics’ motives
- D.even-handed
- E.nostalgic for the practice of full cleaning
Show the answer
Answer: D. even-handed
Working
The author reports each position in its own terms ("they point out", "they suggest", "critics answer"), adds no evaluative words for either, and ends by noting what both sides share. That is an even-handed treatment.
Why the other options are wrong
- A. The author treats both positions as serious; the closing remark finds agreement between them rather than fault with them.
- B. The case for restraint gets more space, but the critics' reply is given the last word in the debate, and the author endorses neither.
- C. The critics' argument is reported, but nothing is said about their motives.
- E. Full cleaning is described as the older norm, with no sign that the author regrets its loss.
What carries over
Reporting verbs with no evaluation, plus a closing note on common ground, mark an even-handed author.
Key points
Topic is what the passage is about; the main idea is what it says; the purpose is what it does.
Test a purpose choice verb first: the verb must match the author’s stance.
Reject choices that are too narrow, too broad, distorted, or wrong in tone.
A main idea must account for the whole passage, including its last turn.
All questions here are original and written for UniExamer; none comes from the test maker.
Written by the UniExamer team with AI assistance. Every worked example and check question was re-solved by an independent checker before publication. No subject expert has reviewed this lesson yet. If you find a mistake, write to support@uniexamer.com.