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英語の練習

TOEFL iBT Readingの“Read an Academic Passage”:“Why does the author mention…?”問題の解き方

Two adults discuss a research report at a campus study table.

2026年に導入されたTOEFL iBTの形式にある“Read an Academic Passage”で、目的を問う問題を解く方法:例の役割、観察結果と提案の区別、慎重な主張(ヘッジ)、試験向けの練習法とよくある間違い。中上級(B2)以上の学習者向けです。

TOEFL iBTの“Read an Academic Passage”では、学術的なテーマの短い文章を読み、多肢選択式の問題に答えます。よく出る問題の一つが、筆者がなぜある例に触れているのかを問うものです。正解は例の中身だけでなく、例が果たす役割、たとえば主張を具体的に示す、あるいは主張に限定を加えるといった役割を述べています。ほかの問題では、研究が観察したことと研究者が提案していることを区別できるかが問われます。この記事は2026年に導入されたTOEFL iBTの形式に基づき、中上級(B2)以上の受験者に向けて書きました。

この記事が向いている人

  • 2026年に導入されたTOEFL iBTの形式に向けて準備し、学術的な文章は追えるのに“Why does the author mention…?”の問題で間違える受験者。
  • もっともらしいけれど言い過ぎの選択肢を選んでしまう方。たとえば“Tables alone caused the increase”。
  • 学術的な文章やゼミの議論で使う慎重な表現も身につく、読解の習慣がほしい大学進学希望者。
  • まだ早い:学術的な段落を読むとまだ1行ごとに辞書を引く場合(B2未満)は、お知らせやメッセージのような短い日常的な読解問題から始め、あとで戻ってきましょう。
  • 簡単すぎる:すべての例の目的とすべての研究の限界を間違いなく説明できるなら、読解問題全体の間違いの見直しとリスニング問題に進みましょう(下のリンク)。

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単語カード

Personal · noise and study

Where do you study best: in silence or with some background noise? Why do you think that is?

Useful: ‘I tend to concentrate better when…’ · ‘It probably depends on the task.’ · ‘For example, when I’m…’

Personal · being understood

Think of a time you changed the way you spoke to be understood, for example in a new language or group. Did it cost you anything?

Useful: ‘I had to…, which meant that…’ · ‘It worked, but I felt…’ · ‘Looking back, I might have…’

文の形

  1. Choose the words that complete the sentence from the passage.

    Birds in noisier areas tended ______ songs with a higher minimum pitch.

    答えと解説を見る

    to sing

    Tend is followed by to + base verb: tended to sing.

  2. Choose the words that complete the sentence from the passage.

    The explanation seems ______: by raising the lowest notes of their songs, birds move their signal away from the low rumble of traffic

    答えと解説を見る

    straightforward

    Seem works like be: it is followed by an adjective, not an adverb.

  3. Choose the words that complete the sentence from the passage.

    The comparison with human speech is useful, but it may also ______ misleading.

    答えと解説を見る

    be

    A modal verb such as may is followed by the base form without to: may be.

  4. Choose the words that complete the sentence from the passage.

    These explanations are not mutually exclusive, and it is likely ______ more than one operates in some populations.

    答えと解説を見る

    that

    It is likely is followed by a that-clause with its own subject and verb.

  5. Choose the words that complete the sentence from the passage.

    In some species, lower-pitched songs appear ______ more attractive to females

    答えと解説を見る

    to be

    Appear is followed by to + base verb: appear to be.

  6. Choose the words that complete the sentence from the passage.

    In some species, lower-pitched songs appear to be more attractive to females, ______ because only larger or healthier males can produce them.

    答えと解説を見る

    possibly

    An adverb modifies the whole because-clause and marks it as one possible reason.

  7. Choose the words that complete the sentence from the passage.

    Urban birds clearly change the way they sing, and noise is very ______ one of the reasons.

    答えと解説を見る

    likely

    Very likely here means probably; it limits how strongly the author claims noise is a cause.

  8. Choose the words that complete the sentence from the passage.

    Whether that change represents a successful adaptation, a costly compromise or both is still ______ debated.

    答えと解説を見る

    being

    Is still being + past participle is the present continuous passive: the debate is going on now.

追加の練習

Explain Why an Example Is There — worked model

Two adults discuss a research report at a campus study table.

A reading club once gave new members a long list of rules, and few people remembered them. The club replaced the list with three illustrated situations. A concrete example is a specific case that makes a general idea easier to understand. In one picture, a member moves to a quiet corner before answering a phone call. The picture is not really about telephones. It shows how a general rule, respecting other readers, can become a visible action that new members can copy.

What the model shows

  • Definition: a concrete example is a specific case.
  • Function: the phone-call situation turns an abstract rule into a visible action.
  • Wrong scale: “the picture includes a phone” describes content, not purpose.
  • When a question asks why an example appears, name the larger idea it supports.
  • A detail about the picture can be true but still fail to explain its purpose.
  • The strongest answer connects the example to the general principle it illustrates.
  • Read the sentences before and after the example to identify the link.

Find the supported response

A student research group wanted to understand how people learn the categories in a digital museum catalogue. One version grouped objects by the material they were made from. Another grouped them by what people had used them for. The group asked twelve volunteers to find several objects in each version and explain their choices aloud.

A wooden cooking bowl illustrates why these systems can lead to different search paths. In a material-based catalogue, a visitor might look under wood. In a use-based catalogue, the same visitor might look under preparing food. Neither description is necessarily wrong; each highlights a different feature of the object.

Some volunteers found the use-based categories more familiar, while others preferred the material-based labels. Several changed strategy after seeing an object they had not expected. The researchers concluded that a catalogue can support different users by offering more than one route. They did not claim that one classification system was universally best. Their small project also examined search behaviour, not how much visitors remembered about the objects afterward.

  1. Why does the author describe the wooden cooking bowl?

    答えと解説を見る

    To show how one object can fit different classification systems

    The bowl connects the two systems: material points to wood, while function points to preparing food.

  2. What did the volunteers do during the project?

    答えと解説を見る

    Find objects and explain their choices aloud

    The first paragraph says they found objects in each version and explained their choices.

  3. What does highlights most nearly mean here?

    答えと解説を見る

    Draws attention to

    Each system draws attention to a different feature of the same object.

Check the deeper meaning

A student research group wanted to understand how people learn the categories in a digital museum catalogue. One version grouped objects by the material they were made from. Another grouped them by what people had used them for. The group asked twelve volunteers to find several objects in each version and explain their choices aloud.

A wooden cooking bowl illustrates why these systems can lead to different search paths. In a material-based catalogue, a visitor might look under wood. In a use-based catalogue, the same visitor might look under preparing food. Neither description is necessarily wrong; each highlights a different feature of the object.

Some volunteers found the use-based categories more familiar, while others preferred the material-based labels. Several changed strategy after seeing an object they had not expected. The researchers concluded that a catalogue can support different users by offering more than one route. They did not claim that one classification system was universally best. Their small project also examined search behaviour, not how much visitors remembered about the objects afterward.

  1. What recommendation follows from the findings?

    答えと解説を見る

    Offer more than one route through the catalogue

    Different preferences and changing strategies support giving users more than one route.

  2. Why does the passage mention volunteers changing strategy?

    答えと解説を見る

    To show that a user’s approach may depend on the object

    Several volunteers changed strategy after an unexpected object; this supports flexible search routes.

  3. Which question was outside the project’s stated scope?

    答えと解説を見る

    How much visitors remembered later

    The final sentence says the project examined search behaviour rather than later memory.

Explain and transfer the strategy

A student research group wanted to understand how people learn the categories in a digital museum catalogue. One version grouped objects by the material they were made from. Another grouped them by what people had used them for. The group asked twelve volunteers to find several objects in each version and explain their choices aloud.

A wooden cooking bowl illustrates why these systems can lead to different search paths. In a material-based catalogue, a visitor might look under wood. In a use-based catalogue, the same visitor might look under preparing food. Neither description is necessarily wrong; each highlights a different feature of the object.

Some volunteers found the use-based categories more familiar, while others preferred the material-based labels. Several changed strategy after seeing an object they had not expected. The researchers concluded that a catalogue can support different users by offering more than one route. They did not claim that one classification system was universally best. Their small project also examined search behaviour, not how much visitors remembered about the objects afterward.

Your open task

  • Explain the bowl example using a different everyday object with two possible categories.
  • Distinguish one observed result from the researchers’ recommendation.
  • Propose an additional catalogue route and explain who might benefit.

Find the supported response

A campus design class conducted a small observation project in a courtyard. For one week, the courtyard contained only individual chairs. During a second week, the same chairs were placed around several small tables. The students counted how many visitors spoke to someone they had not arrived with. They also asked a few visitors why they had chosen a particular seat.

More new conversations were observed during the second week. Some visitors said that a shared table gave them an easy reason to speak, such as asking whether a place was free. Others still preferred an isolated chair, especially when reading or making a phone call. The students therefore proposed a mixed arrangement rather than replacing every individual seat.

Their report was cautious. The weather was warmer in the second week, and a campus event brought extra visitors to the area. These differences could have influenced the observations. The project suggested that furniture arrangement may facilitate conversation, but it did not establish that tables alone caused the change.

  1. Which statement best captures the passage’s main idea?

    答えと解説を見る

    Shared tables may encourage conversation, but the evidence has limits

    The report links arrangement to possible conversation benefits while explicitly noting confounding differences.

  2. Why did some visitors prefer an isolated chair?

    答えと解説を見る

    They wanted to read or make a phone call

    The second paragraph gives reading and phone calls as reasons for choosing individual seating.

  3. What does facilitate most nearly mean in this passage?

    答えと解説を見る

    Make easier

    Shared tables gave visitors an easy opening for conversation; facilitate therefore means make easier.

Check the deeper meaning

A campus design class conducted a small observation project in a courtyard. For one week, the courtyard contained only individual chairs. During a second week, the same chairs were placed around several small tables. The students counted how many visitors spoke to someone they had not arrived with. They also asked a few visitors why they had chosen a particular seat.

More new conversations were observed during the second week. Some visitors said that a shared table gave them an easy reason to speak, such as asking whether a place was free. Others still preferred an isolated chair, especially when reading or making a phone call. The students therefore proposed a mixed arrangement rather than replacing every individual seat.

Their report was cautious. The weather was warmer in the second week, and a campus event brought extra visitors to the area. These differences could have influenced the observations. The project suggested that furniture arrangement may facilitate conversation, but it did not establish that tables alone caused the change.

  1. Why is the campus event mentioned?

    答えと解説を見る

    It may have affected who used the courtyard

    The event brought extra visitors, so it is a possible influence beyond furniture arrangement.

  2. What arrangement did the students recommend?

    答えと解説を見る

    A combination of shared and individual seating

    The report proposes a mixed arrangement in response to different visitor preferences.

  3. Which conclusion is too strong for the evidence?

    答えと解説を見る

    Tables alone caused the increase in conversations

    The final paragraph explicitly rejects a claim that tables alone caused the observed change.

Explain and transfer the strategy

A campus design class conducted a small observation project in a courtyard. For one week, the courtyard contained only individual chairs. During a second week, the same chairs were placed around several small tables. The students counted how many visitors spoke to someone they had not arrived with. They also asked a few visitors why they had chosen a particular seat.

More new conversations were observed during the second week. Some visitors said that a shared table gave them an easy reason to speak, such as asking whether a place was free. Others still preferred an isolated chair, especially when reading or making a phone call. The students therefore proposed a mixed arrangement rather than replacing every individual seat.

Their report was cautious. The weather was warmer in the second week, and a campus event brought extra visitors to the area. These differences could have influenced the observations. The project suggested that furniture arrangement may facilitate conversation, but it did not establish that tables alone caused the change.

Your open task

  • Explain the main claim to someone who has not read the report, including one limitation.
  • Use facilitate in a new sentence about learning or communication.
  • Suggest one change that would make a follow-up observation easier to interpret.

Infer Carefully and Check Exceptions — worked model

Two adults discuss a research report at a campus study table.

In a small study, a class surveyed twenty people who used a neighbourhood noticeboard. Most said they noticed large headings before reading smaller details. The class concluded that headings deserved careful attention when a message was designed. It did not conclude that readers ignored all smaller text or that every neighbourhood had the same preferences.

An inference combines information that the passage supplies. If headings are noticed first, a heading may affect whether a reader continues. This is a cautious extension of the observation. By contrast, claiming that a particular font doubles attendance would require evidence that the passage never provides. The size of the sample also limits how widely the finding can be applied.

What the model shows

  • A warranted inference stays close to stated evidence.
  • Not stated and contradicted are different: an unmentioned font effect is simply unsupported.
  • Watch absolute words such as all, always and proves.
  • For an EXCEPT question, verify the supported choices before identifying the unsupported one.

Find the supported response

A student project compared two versions of a notice about borrowing sports equipment. Both versions contained the same information: collection hours, return instructions and a contact address. In Version A, this information appeared in one continuous paragraph. In Version B, it appeared under three short headings. Sixteen students each read one version and then described what they would do to borrow and return an item.

Students who read Version B more often mentioned the return instructions without being prompted. However, the two groups were similar in how often they recalled the contact address. Several readers of Version A said they had focused on the opening sentence and overlooked later details.

The project team suggested using headings when a notice contains several separate actions. The team also noted important limits. The students were volunteers from one class, the groups were small, and the project involved only one notice. A later study would need different readers and messages before the team could make broader claims about notice design.

  1. Which inference is best supported?

    答えと解説を見る

    Headings may help readers notice separate actions in a message

    Version B improved recall of return instructions, supporting a limited claim about noticing separate actions.

  2. What was the same in both notice versions?

    答えと解説を見る

    The information about collection, return and contact

    The first paragraph states that the same information appeared in different layouts.

  3. Which detail did the two groups recall at similar rates?

    答えと解説を見る

    The contact address

    The second paragraph directly contrasts similar contact-address recall with different return-instruction recall.

Check the deeper meaning

A student project compared two versions of a notice about borrowing sports equipment. Both versions contained the same information: collection hours, return instructions and a contact address. In Version A, this information appeared in one continuous paragraph. In Version B, it appeared under three short headings. Sixteen students each read one version and then described what they would do to borrow and return an item.

Students who read Version B more often mentioned the return instructions without being prompted. However, the two groups were similar in how often they recalled the contact address. Several readers of Version A said they had focused on the opening sentence and overlooked later details.

The project team suggested using headings when a notice contains several separate actions. The team also noted important limits. The students were volunteers from one class, the groups were small, and the project involved only one notice. A later study would need different readers and messages before the team could make broader claims about notice design.

  1. All of the following are stated limits EXCEPT:

    答えと解説を見る

    The notices contained different information

    Different information is not a stated limitation; the two versions explicitly contained the same information.

  2. Why would a later study need different readers and messages?

    答えと解説を見る

    To examine whether the finding extends beyond this small project

    The limited sample and single message prevent broad conclusions without further investigation.

  3. What does overlooked most nearly mean here?

    答えと解説を見る

    Failed to notice

    Readers focused on the opening and missed later details; overlooked means failed to notice.

Explain and transfer the strategy

A student project compared two versions of a notice about borrowing sports equipment. Both versions contained the same information: collection hours, return instructions and a contact address. In Version A, this information appeared in one continuous paragraph. In Version B, it appeared under three short headings. Sixteen students each read one version and then described what they would do to borrow and return an item.

Students who read Version B more often mentioned the return instructions without being prompted. However, the two groups were similar in how often they recalled the contact address. Several readers of Version A said they had focused on the opening sentence and overlooked later details.

The project team suggested using headings when a notice contains several separate actions. The team also noted important limits. The students were volunteers from one class, the groups were small, and the project involved only one notice. A later study would need different readers and messages before the team could make broader claims about notice design.

Your open task

  • Give a cautious conclusion using may or suggests and support it with one observation.
  • Explain why one unsupported statement is not the same as a disproved statement.
  • Design a better follow-up comparison in two or three sentences.

Careful claims: hedging in the passage

  1. Choose the words that complete the sentence from the passage.

    Birds in noisier areas tended ______ songs with a higher minimum pitch.

    答えと解説を見る

    to sing

    Tend is followed by to + base verb: tended to sing.

  2. Choose the words that complete the sentence from the passage.

    The explanation seems ______: by raising the lowest notes of their songs, birds move their signal away from the low rumble of traffic

    答えと解説を見る

    straightforward

    Seem works like be: it is followed by an adjective, not an adverb.

  3. Choose the words that complete the sentence from the passage.

    The comparison with human speech is useful, but it may also ______ misleading.

    答えと解説を見る

    be

    A modal verb such as may is followed by the base form without to: may be.

  4. Choose the words that complete the sentence from the passage.

    These explanations are not mutually exclusive, and it is likely ______ more than one operates in some populations.

    答えと解説を見る

    that

    It is likely is followed by a that-clause with its own subject and verb.

  5. Choose the words that complete the sentence from the passage.

    In some species, lower-pitched songs appear ______ more attractive to females

    答えと解説を見る

    to be

    Appear is followed by to + base verb: appear to be.

  6. Choose the words that complete the sentence from the passage.

    In some species, lower-pitched songs appear to be more attractive to females, ______ because only larger or healthier males can produce them.

    答えと解説を見る

    possibly

    An adverb modifies the whole because-clause and marks it as one possible reason.

  7. Choose the words that complete the sentence from the passage.

    Urban birds clearly change the way they sing, and noise is very ______ one of the reasons.

    答えと解説を見る

    likely

    Very likely here means probably; it limits how strongly the author claims noise is a cause.

  8. Choose the words that complete the sentence from the passage.

    Whether that change represents a successful adaptation, a costly compromise or both is still ______ debated.

    答えと解説を見る

    being

    Is still being + past participle is the present continuous passive: the debate is going on now.

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問題の形

文章を一つ読みます。たとえば短い研究の紹介や科学的な説明です。背景知識は必要ありません。正解の根拠はすべて本文の中にあります。練習問題では次の五つが問われます。

  • 主旨:“Which statement best captures the passage’s main idea?”
  • 詳細:“What did the volunteers do during the project?”
  • 語彙:“What does highlights most nearly mean here?”
  • 推論:“Which inference is best supported?”
  • 目的:“Why is the campus event mentioned?”

目的を問う問題:例が何をしているかを考える

例とは、一般的な考えをわかりやすくする具体的なケースです。目的を問う問題は、例の中身ではなく役割を尋ねています。まず役割に名前をつけましょう。具体的に示す、対比する、思い浮かべやすくする、主張に限定を加える、などです。

物を素材か用途で分類する博物館のカタログについての文章で試してみましょう。来館者は同じ物を“wood”の項目でも“preparing food”の項目でも探す可能性があります。

  • “A wooden cooking bowl illustrates why these systems can lead to different search paths.”
筆者はなぜ木製の調理用ボウルについて述べているのですか?

観察か、提案か、検証されていない主張か

誤答は、研究のいくつかの層を混同していることがよくあります。

  • 観察:“Some volunteers found the use-based categories more familiar, while others preferred the material-based labels.”
  • 提案:“The researchers concluded that a catalogue can support different users by offering more than one route.”
  • 範囲外:本文は、この研究が“examined search behaviour, not how much visitors remembered about the objects afterward”と述べています。そのため、記憶についての選択肢には根拠がありません。
  • 限界:ある中庭の観察では共有テーブルのまわりで会話が増えましたが、その週は気温が高く、キャンパスの行事で来訪者も増えていました。そのため“Tables alone caused the increase”は言い過ぎです。

ヘッジ:慎重な筆者は主張をどう限定するか

学術的な文章の筆者は根拠に合わせて主張を弱め、正解の多くはその慎重さを保っています。文法に注目しましょう。

  • tend to+動詞の原形:“Birds in noisier areas tended to sing songs with a higher minimum pitch.”
  • seem+形容詞(副詞ではない):“The explanation seems straightforward.”
  • may+toなしの動詞の原形:“The comparison with human speech is useful, but it may also be misleading.”
  • it is likely that+完全な節:“It is likely that more than one operates in some populations.”
  • appear to be:“lower-pitched songs appear to be more attractive to females”
自分に合った方法でこの単元を学ぶ

よくある間違い

日本語では「〜かもしれない」「〜と考えられる」のように、慎重さを表す言葉が文末に来ます。英語では文頭(“It is likely that…”)や動詞の直前(“tended to”)に来るので、見落とさないようにしましょう。

  • 例がなぜあるのかを説明せず、例を描写するだけの選択肢を選ぶこと。
  • 本文が慎重なのに、“all”、“always”、“proves”を含む選択肢を受け入れること。
  • 比較を文字どおりに受け取ること:にぎやかなパーティーで声を張り上げる人の例は、交通騒音の中で歌う鳥を思い浮かべやすくしますが、筆者はこの比較が誤解を招くかもしれないと注意しています。
  • EXCEPTの問題で、本文が支持する選択肢を先に確認しないこと。

練習のしかた

1日に文章一つで習慣が身につきます。この練習は約20分です。

  • 読む:主旨を、その限界も含めて一文で書きます。
  • 答える:選んだ答えの根拠になる文をメモします。
  • 分ける:三つの文に、観察・提案・限界のどれかの印をつけます。
  • 応用する:ボウルの例を自分で選んだ物で説明します。自転車のヘルメットなら“plastic”にも“safety equipment”にも入ります。
  • 話す:ディスカッションの質問一つに、ヘッジを使って声に出して答えます。たとえば“I tend to concentrate better when…”や“It probably depends on the task.”です。

次のステップ

すべての例の役割とすべての研究の限界を言えるようになったら、読解問題全体の間違いを見直し、リスニングに進みましょう。リスニングでも、答えは根拠と正確に合っている必要があります。

よくある質問

TOEFL iBTの“Read an Academic Passage”とは何ですか?

2026年に導入されたTOEFL iBTの形式にあるReadingの問題です。短い学術的な文章を読み、主旨、詳細、語彙、推論、例の目的を問う多肢選択式の問題に答えます。

TOEFLの読解で“Why does the author mention…?”にはどう答えればよいですか?

例の前後の文を読み、例がどんな一般的な論点を支えているかを決めてから、「具体的に示す」「対比する」のように役割を述べた選択肢を選びます。例を描写するだけの選択肢は、たいていひっかけです。

TOEFLの読解で「書かれていない」と「誤り」は同じですか?

違います。誤りの文は本文と矛盾し、書かれていない文は根拠がないだけです。フォントにまったく触れていない文章での、フォントについての主張がその例です。本文の内容を問う問題では、どちらも正解になりません。

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