結論：NEW TREASURE（ニュートレジャー）Stage 2 Lesson 6の受動態を応用するなら、look after→be looked after、talk about→be talked about、take care of→be taken care of、refer to→be referred toのように、動詞と結びついた前置詞を消さないことが重要です。The plants were taken care of. のofを落とすと表現が成立しません。慶英会独自の40問・全解答・意味の違いと英作文を無料公開します。
慶英会 塾長
慶英グループ CEO
一般選抜にて慶應義塾大学合格（英語入試正答率97％）
成績優秀者（慶應義塾維持会奨学生）として
慶應義塾大学を卒業（2023年）
慶英会は、中高一貫校の英語・NEW TREASURE対策・英検対策を専門とするオンライン個別指導塾です。学校の授業進度や学力・目標に合わせて指導します。
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（最前列左から2人目：塾長）
Ｚ会公式ではStage 2 Lesson 6に受動態を配置しています。本記事は多語動詞・前置詞を伴う受動態の発展的な補充演習で、全てが教科書のLesson 6の必修語法という意味ではありません。受動態の基本を理解した後に使用し、学校の進度を優先してください。
前置詞を消さない受動態の例
- look after：Teachers looked after the children. → The children were looked after.（世話をする）
- talk about：They talked about the plan. → The plan was talked about.（話題にする）
- take care of：They took care of the plants. → The plants were taken care of.（世話をする）
- refer to：They referred to the map. → The map was referred to.（言及する）
- speak to：The volunteer spoke to Ken. → Ken was spoken to.（話しかける）
look afterとlook atは意味がまったく違う
The children were looked after. は世話・監督されたという意味です。The painting was looked at. なら絵画を見たという意味です。lookという動詞だけを訳すと誤答するため、前置詞も一緒に覚えてください。
受動態にできても自然な文になるとは限らない
The speech was listened to by the students. は文法的に成立しますが、日常的にはThe students listened to the speech. の方が読みやすい場面もあります。受動態は何を主語として伝えたいかで選び、書き換えの練習だけでいつでも受動文を推奨するわけではありません。
多語動詞の語順がなぜ重要か
Cambridge Dictionaryはlook after・listen to・look atなどのprepositional verbsを、一まとまりとして覚えることを推奨しています。前置詞を取ってしまうと、何を世話したか・何を聞いたかという意味の関係が失われます。
問題編｜前置詞を残す受動態40問
1．look after・talk about・laugh atの受動態（Q1〜Q8）
受動態で主語に移した名詞が、元の動詞のどの前置詞とつながっていたかを説明してください。
- Q1. The teacher looked after the younger students. → The younger students …
- Q2. The group talked about the plan. → The plan …
- Q3. A few people laughed at his idea. → His idea …
- Q4. Complete: The students were looked (after / of) by their teacher.
- Q5. Complete: The question was talked (about / for) in the meeting.
- Q6. Complete: Nobody should be laughed (at / to) because of a mistake.
- Q7. Change: The team looked after the equipment.〔受動態〕
- Q8. Change: They spoke about the new rule.〔受動態、主語はthe new rule〕
2．take care of・refer to・speak to（Q9〜Q16）
受動態で主語に移した名詞が、元の動詞のどの前置詞とつながっていたかを説明してください。
- Q9. Complete: The plants were taken care (of / on) by the students.
- Q10. Complete: The official guide was referred (to / for) during the lesson.
- Q11. Complete: The visitor was spoken (to / for) politely by the volunteer.
- Q12. Rewrite: The class took care of the plants.
- Q13. Rewrite: The presenter referred to the map.
- Q14. Rewrite: The guide spoke to the visitors.
- Q15. Which is correct? (A) The report was referred. (B) The report was referred to.
- Q16. Which is correct? (A) The dog was taken care of. (B) The dog was taken care.
3．listen to・deal with・look atなど発展（Q17〜Q24）
受動態で主語に移した名詞が、元の動詞のどの前置詞とつながっていたかを説明してください。
- Q17. The students listened to the talk. → The talk …〔受動態の形を練習〕
- Q18. The teacher dealt with the problem. → The problem …
- Q19. The visitors looked at the old map. → The old map …〔文法的に〕
- Q20. Complete: This issue should be dealt (with / at) carefully.
- Q21. Complete: The explanation was listened (to / on) by the audience.
- Q22. Complete: The painting was looked (at / on) during the tour.
- Q23. Correct: The issue was dealt carefully.〔対応した〕
- Q24. Correct: The presentation was listened carefully.〔聞いた〕
4．誤文訂正・英作文・ニュアンス（Q25〜Q32）
受動態で主語に移した名詞が、元の動詞のどの前置詞とつながっていたかを説明してください。
- Q25. Correct: The children were looked by a teacher.〔世話をした〕
- Q26. Correct: The rule was talked in class.〔その規則が話題にされた〕
- Q27. Correct: The text was referred during the lesson.〔本文に言及した〕
- Q28. Correct: The plants were taken care by the club.
- Q29. Translate: 『その問題は会議で話し合われました』 using talked about.
- Q30. Translate: 『植物は生徒によって世話されました』 using taken care of.
- Q31. Translate: 『その地図は発表中に言及されました』 using referred to.
- Q32. Explain why ‘The students were looked after’ differs from ‘The students were looked at’.
5．学校展示の英語Read8問（Q33〜Q40）
A fictional middle school prepared an English exhibition. The younger volunteers were looked after by their teacher during the preparations. They were told to follow school safety rules and ask for help with equipment. The students talked about the display plan, and the plan was talked about again at a meeting.
One group took care of some classroom plants. Its report said, ‘The plants were taken care of by the students.’ Another group used an official school map. During the presentation, the map was referred to several times. The teacher explained that in each passive sentence a preposition remained after the past participle.
A draft also contained the sentence, ‘The visitors were looked after by the map.’ The teacher said the sentence had confused two meanings. A map could be looked at or referred to, but it did not care for people. The students rewrote the guide to say that a volunteer helped the visitors and referred to the map while explaining directions.
After the exhibition, the group dealt with questions from visitors. Several students thanked the volunteers for their careful explanations. The class did not claim that every visitor had understood every instruction because that result had not been measured. Its final report used the active voice where it sounded natural and the passive where the subject of an action was more important.
- Q33. Who looked after younger volunteers?
- Q34. What did students discuss in the meeting?
- Q35. Who took care of the classroom plants?
- Q36. What was referred to during the presentation?
- Q37. Why was ‘visitors were looked after by the map’ incorrect in context?
- Q38. What did the volunteer use when giving directions?
- Q39. What did the group deal with after the exhibition?
- Q40. Did the class prove that every visitor understood all instructions?
全40問の正答・前置詞を残す理由
各問1点で40点満点の自習用教材です。文法的に正しい受動態でも、状況によって能動態の方が自然な場合があることに注意してください。慶英会が全設問に答えと理由を付けています。
look after・talk about・laugh atの受動態の解答（Q1〜Q8）
- Q1. were looked after by the teacher. — look afterのafterは受動態でも残す。
- Q2. was talked about by the group. — talk aboutのaboutを残す。
- Q3. was laughed at by a few people. — laugh atのatを残す。
- Q4. after — look after＋人を受動化。
- Q5. about — talk about＋話題。
- Q6. at — laugh atのat。
- Q7. The equipment was looked after by the team. — look afterは世話・管理の意味。
- Q8. The new rule was spoken about. — speak aboutのaboutを残す。talked aboutも自然。
take care of・refer to・speak toの解答（Q9〜Q16）
- Q9. of — take care ofのofを保持。
- Q10. to — refer to＋資料は受動態でもtoを残す。
- Q11. to — speak to＋人のtoを残す。
- Q12. The plants were taken care of by the class. — take care ofをまとまりとして残す。
- Q13. The map was referred to by the presenter. — refer toのtoを残す。
- Q14. The visitors were spoken to by the guide. — speak to＋人。
- Q15. (B) The report was referred to. — 資料に言及する意味でtoが必要。
- Q16. (A) The dog was taken care of. — take care ofのofが残る。
listen to・deal with・look atなど発展の解答（Q17〜Q24）
- Q17. was listened to by the students. — listen toのtoを残す。自然さでは能動文もよく使う。
- Q18. was dealt with by the teacher. — deal withのwithを残す。
- Q19. was looked at by the visitors. — look atのatを残す。自然な文章では能動文も使える。
- Q20. with — deal withのwith。
- Q21. to — listen toのto。
- Q22. at — look atを受動化する場合もat。
- Q23. The issue was dealt with carefully. — deal withのwithを補う。
- Q24. The presentation was listened to carefully. — listen toのtoを補う。
誤文訂正・英作文・ニュアンスの解答（Q25〜Q32）
- Q25. The children were looked after by a teacher. — looked afterで世話をされた。
- Q26. The rule was talked about in class. — talked aboutのabout。
- Q27. The text was referred to during the lesson. — referred toのto。
- Q28. The plants were taken care of by the club. — ofが必要。
- Q29. The problem was talked about at the meeting. — 受動態＋about。
- Q30. The plants were taken care of by the students. — 過去分詞takenとofを使用。
- Q31. The map was referred to during the presentation. — refer to＋資料。
- Q32. Looked after means cared for; looked at means viewed. — 同じlookでも前置詞で意味が変わる。
読解Q33〜Q40の解答
- Q33. Their teacher. — Looked after indicates care or supervision.
- Q34. The display plan. — The plan was talked about.
- Q35. A group of students. — The plants were taken care of.
- Q36. An official school map. — Referred to keeps the preposition to.
- Q37. A map cannot care for people; it can be looked at or referred to. — Different multi-word verbs have different meanings.
- Q38. The official map. — The map was used as a reference.
- Q39. Questions from visitors. — Deal with means address or handle.
- Q40. No. — That outcome was not measured.
7日間で受動態を読めるようにする
1日目はlook after・talk about、2日目はtake care of・refer to、3日目はlisten to・deal with、4日目は誤文訂正・英作文を各8問学習。5日目は学校展示のReadから多語動詞と前置詞を抽出、6日目に元の能動文と受動文を8組自作し、7日目に40問を白紙で再テストします。
よくある質問
The children were lookedだけで世話された意味になりますか？
なりません。世話をするlook afterならwere looked afterとします。
listen toの受動態は文法的に可能ですか？
可能な場合があります。ただし自然な文体では能動態が好まれることもあります。
take care ofのofはなぜ残りますか？
動詞と前置詞の結びつきが受動態でも維持されるからです。
これは全てStage2必修ですか？
受動態の基本から進む発展的な応用です。学校の範囲を優先してください。
関連教材・慶英会無料相談
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2026年10月26日確認。独自40問と英語Read・解答は慶英会が制作しており、出版社・辞書の例題を転載していません。