慶英会 塾長｜慶應義塾大学卒・英検1級
中高一貫校の学校英語・NEW TREASURE・英検対策を専門とするオンライン個別指導塾です。塾長紹介
英検準1級の意見英作文は、複雑な文を増やせばよいわけではありません。 結論や重要な主張は短く明確に、理由・条件・対比はbecause、although、if、while、whichなどでつなぎます。この記事では「2文を自然につなぐ」「長すぎる文を分ける」「空疎な短文を具体化する」の3段階で、慶英会独自の書き換え30問と全模範・解説を掲載します。
対象は英検2級から準1級に進む中高一貫校生・高校生。英検協会の現行準1級には英文要約と意見英作文がそれぞれ1題あります。意見英作文の120〜150語は公式の解答例で示される目安です。本記事の30問は文単位の補助演習であり、本試験の独自問題の代わりにはなりません。
短文と複文の判断基準
- 主張：I support this proposal. のように簡潔にする
- 理由：because / since などで根拠を説明する
- 制約：although / while で利点だけでなく弱点も述べる
- 条件：if / provided that で実現の前提を明確にする
- 長すぎる文：and や関係詞が連続したら、意味のまとまりで2文へ分ける
独自30問｜解答を見る前に書き換える
Q1〜10：2文の論理関係を明示する
Q1. The service is useful. It reduces travel time.
Q2. The plan is expensive. It may improve safety.
Q3. Students save time. They can use the time to study.
Q4. The program may succeed. The city must provide enough staff.
Q5. The system is convenient. Some elderly users find it difficult.
Q6. The town planted trees. It wanted to create more shade.
Q7. The campaign began. The school collected feedback.
Q8. The volunteers received training. They started their work.
Q9. The library expanded its collection. Visitor numbers stayed the same.
Q10. Public transport reduces traffic. Cycling improves health.
Q11〜20：長すぎる文を2文に分ける
Q11. The new schedule was announced and the passengers who relied on the early bus which had been popular complained because it had been removed.
Q12. The proposal may save money, and this saving is important, and it can make it easier for schools to purchase books, and many pupils may benefit.
Q13. The city opened an online booking system which was convenient for residents who worked during the day and who could not call the office during business hours.
Q14. The program was effective, and it was popular, and it was affordable, and it was easy to run.
Q15. The council considered several possible locations, which all had different transport connections and which were expensive to renovate, so it decided to delay the project.
Q16. Students have little time and they need to study many subjects and they often feel tired and they cannot always prepare for every test.
Q17. The museum displayed digital copies of paintings that were too fragile to travel, which helped visitors who lived far away and who could not visit the original collection.
Q18. A survey showed that visitors preferred more frequent buses while the city was trying to reduce costs and the timetable had already been revised twice during the year.
Q19. The researchers tested the materials at different temperatures and they found some unexpected changes and they said that more research was necessary.
Q20. The company offered employees flexible hours and some employees were satisfied and other employees worried about unfair schedules.
Q21〜30：短文の単調さ・曖昧さ・繰り返しを直す
Q21. I think this idea is good. I think it helps people. I think it should be adopted.
Q22. There are many reasons. The first reason is cost. The second reason is time.
Q23. This method is good, which is good for teachers, which is also good for students.
Q24. Everyone will use the new service because it is easy to use.
Q25. This system saves money, it saves time.
Q26. The policy is expensive but affordable but it is also useful.
Q27. If the school offers online lessons, students can learn at home, and some may not have stable internet access, and teachers may need training.
Q28. The government should do it. It is important. It will help.
Q29. People can reduce waste because they recycle, which helps the environment and reduces waste.
Q30. It is cheap. It is fast. It is helpful. People like it.
全30問の模範答案・改善理由
Q1 模範： The service is useful because it reduces travel time.
改善理由： becauseは理由を表す。主張と理由の二文を一つにつなぐ。
Q2 模範： Although the plan is expensive, it may improve safety.
改善理由： althoughの節で費用という制約を認め、主節で利点を述べる。
Q3 模範： Students save time, which they can use to study.
改善理由： 関係代名詞whichは直前のtimeを先行詞として補足説明する。
Q4 模範： The program may succeed if the city provides enough staff.
改善理由： ifで条件を明示し、未実現の成果を断定しない。
Q5 模範： While the system is convenient, some elderly users find it difficult.
改善理由： whileは「〜である一方」を表し、利用者による違いを示す。
Q6 模範： The town planted trees so that residents could enjoy more shade.
改善理由： so thatで目的を示し、時制を合わせてcouldとする。
Q7 模範： After the campaign began, the school collected feedback.
改善理由： afterで後先関係を明示する。
Q8 模範： Before the volunteers started their work, they received training.
改善理由： beforeで順序を明確にする。
Q9 模範： Although the library expanded its collection, visitor numbers stayed the same.
改善理由： 設備・資料の拡充と成果が一致しない事実を譲歩で結ぶ。
Q10 模範： Public transport can reduce traffic, whereas cycling can improve health.
改善理由： whereasで異なる利点を比較する。文意の確実性に合わせcanを使う。
Q11 模範： The new schedule was announced. Passengers complained because the popular early bus had been removed.
改善理由： 関係詞が二重に続く長文は二文へ分け、理由を明確にする。
Q12 模範： The proposal may save money. Schools could use these savings to purchase books, benefiting pupils.
改善理由： andの連鎖を切り、資金→購入→受益者の順に整理する。
Q13 模範： The city opened an online booking system. It was convenient for residents who could not call during office hours.
改善理由： 主語の修飾を減らして主張と対象を二文に分ける。
Q14 模範： The program was effective and affordable. It was also easy to operate and attracted users.
改善理由： 単純なandの列挙を二文に分け、形容詞と結果を整理する。
Q15 模範： The council considered several locations, but renovation costs were high. It therefore delayed the project.
改善理由： 前半の検討と後半の判断を分離し、thereforeで因果を示す。
Q16 模範： Students study many subjects and often feel tired. As a result, they may struggle to prepare for every test.
改善理由： 同じ主語の繰り返しを抑え、結果を別文にする。
Q17 模範： The paintings were too fragile to travel. The museum therefore displayed digital copies for visitors who lived far away.
改善理由： 関係詞の指示対象の曖昧さを減らす。
Q18 模範： A survey showed that visitors preferred more frequent buses. However, the city was trying to reduce costs and had already revised the timetable twice.
改善理由： 調査結果と市の制約を分け、逆接で関係を示す。
Q19 模範： Researchers tested the materials at different temperatures and observed unexpected changes. They called for further research.
改善理由： 手順と結果・今後の必要性を二文で明確にする。
Q20 模範： The company introduced flexible hours. Some employees welcomed the change, while others worried about unfair schedules.
改善理由： 一文に多数のandを連ねず、対照をwhileで示す。
Q21 模範： I support this idea because it can make essential services more accessible.
改善理由： I thinkの反復を一つの立場と具体的理由に統合する。
Q22 模範： The plan could reduce both costs and the time needed to complete each task.
改善理由： 空疎な列挙を具体的な二つの便益へ短縮する。
Q23 模範： This method may benefit teachers by simplifying preparation. Students could also receive clearer instructions.
改善理由： 曖昧なgoodと二重のwhichを具体的な作用へ置き換える。
Q24 模範： The new service may attract more users because its procedures are simple.
改善理由： everyoneという根拠のない全称をmay attractに弱める。
Q25 模範： This system saves money and reduces the time required for routine tasks.
改善理由： カンマだけで独立節を接続するcomma spliceを修正する。
Q26 模範： Although the policy requires significant investment, it could provide long-term benefits.
改善理由： 同じ概念について矛盾する形容詞を並べず、費用と便益を整理する。
Q27 模範： Online lessons could improve access for some students. However, unstable connections and teacher training requirements could limit their benefits.
改善理由： 利点と制約は別文に分け、接続語で関係を示す。
Q28 模範： Governments should expand public transport because reliable services can improve access to work and education.
改善理由： itの指示先が曖昧なので政策名と具体的効果を明示する。
Q29 模範： Recycling can reduce the amount of waste sent to landfills. It may also conserve resources.
改善理由： 同じ「ごみを減らす」を重複させず、異なる結果を述べる。
Q30 模範： The service is affordable and efficient. These advantages may make it attractive to users.
改善理由： 短文4つを無理に一つの長文にせず、二文にまとめて指示語を明確にする。
120〜150語の意見英作文に組み込む｜独自モデル
Topic：Should cities invest more in public libraries?
模範英作文（130語）：
I believe that cities should invest more in public libraries. First, libraries give students access to reliable information without requiring them to purchase expensive books. This is particularly helpful for families with limited budgets. Libraries also provide quiet spaces where students can concentrate after school. Second, modern libraries can support adults who need to develop new skills. For example, they can offer basic digital training and help residents use online public services. Admittedly, expanding library services requires funding and trained staff. However, cities can begin with small programs, evaluate demand, and expand successful services gradually. In this way, local governments can improve educational opportunities while controlling costs. For these reasons, I support further investment in public libraries, provided that each program is reviewed regularly and adjusted to meet local needs.
日本語の要点：公共図書館への投資を支持する。理由①は家計負担を増やさず信頼できる情報と静かな学習場所にアクセスできること。理由②は大人のデジタル技能訓練を支援できること。財源と人材確保という制約は認め、小規模試行・需要評価・段階的拡大を提案する。単純な文で立場を示し、because/although/however/provided thatなどで必要な論理関係だけをつなぐ。
採点前の自己点検
- 代名詞it・theyの指示先が明確か
- 独立節をカンマだけでつないでいないか
- 情報が多い文を無理に一文へ詰めていないか
- 理由が二つとも同じ内容になっていないか
- 数字や実績を根拠なく作っていないか
- 文章全体の指定語数と、内容・構成・語彙・文法を見直したか
よくある質問
Q. 分詞構文や関係代名詞を多く使うほど高評価ですか？ A. 単純に数が多ければよいわけではありません。論理関係と正確さを優先し、必要な場所で構文を使います。
Q. 30問の模範と違う文でも正解ですか？ A. 書き換えには複数の自然な解答があり得ます。本記事は模範の一例とその改善理由を示しています。意味が変わらず文法的に自然であれば、別の英文も成立します。
関連する慶英会教材と無料体験
接続語の使いすぎを直す独自30問／理由→仕組み→具体例の独自36問／準1級の無料教材一覧。学校英語と準1級の英作文を両立したい方は、最大1か月完全無料体験・学習相談へ。
参考にした主な公式情報
英検公式形式確認：2026年11月3日。本記事の英文・30問と模範英作文は慶英会独自の教材です。
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慶英会 塾長｜慶應義塾大学卒・英検1級。中高一貫校の学校英語・NEW TREASURE・英検対策を専門としています。塾長の経歴・指導方針を確認する