英検準2級プラスのonly if・unless・provided that・otherwise｜条件と例外の独自40問【全訳】

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

最大1か月完全無料体験・学習相談（Web）｜公式LINEで相談｜料金・無料体験の条件

英検準2級プラスのEメール・説明文では、only if（～の場合に限り）・unless（～でない限り）・provided that（～という条件で）・otherwise（そうしないと）を区別すると、利用条件・例外・結果を正確に理解できます。only ifは必要条件を示しますが、それだけで十分条件になるとは限りません。慶英会独自の40問（短文8問・長文4題32問）で、申請・予約・安全条件の読み取りを練習します。全解答・全文和訳付きです。

結論｜4つの条件表現を使い分ける

• only if A：Aが成立する場合に限る。Aは必要条件だが、ほかにも条件がある可能性。
• unless A：Aでない限り。例：The event will continue unless the weather becomes dangerous.
• provided that A：Aという条件を満たす場合に。具体的な利用・許可条件を示す。
• otherwise：そうしなければ、さもなければ。前文の手順を実行しない場合の結果を示す副詞。

例として、研究室に入れるのは申請が承認された場合だけ（only if）でも、承認後に時間予約が必要なら申請承認だけでは十分ではありません。unlessは例外、otherwiseは指示を守らなかった場合に起こり得る結果を示します。

英検準2級プラスの公式形式

日本英語検定協会の準2級プラスReadingは短文空所補充17問、長文空所補充6問、長文内容一致8問です。公式試験内容。以下は慶英会が独自に制作した練習問題で、公式過去問ではありません。

Part 1｜必要条件・例外・結果の短文8問

問1

Visitors can use the archive room ___ their applications have been approved.

問2

The outdoor talk will go ahead ___ severe weather makes the site unsafe.

問3

Students may borrow the equipment ___ they return it by Friday.

問4

Check the revised timetable before leaving. ___, you may miss the new bus.

問5

A family is eligible for the discount ___ it presents a valid membership card.

問6

The guide will use the original path ___ the bridge is closed for repairs.

問7

The committee will accept late work ___ the teacher has granted an extension.

問8

Keep a copy of your confirmation email. ___, staff may be unable to verify your booking quickly.

Part 2｜公共施設・学校・交通の独自4長文32問

文章の条件をA・Bに分け、必要条件と実際に確定したことを混同しないようにしてください。

長文1｜図書館の研究室｜承認が必要でも席の確約とは限らない

Reading passage（慶英会オリジナル）

A town library made its research room available to students working on local history. Under the library’s fictional policy, visitors could enter the room only if an application had been approved. Applications had to describe the research topic and requested date. The librarian explained that approval was a necessary condition for entry, but it did not automatically guarantee an empty desk at every hour. Visitors with approval were asked to reserve a time slot as well. Students could use the old map collection provided that they handled the documents under staff supervision. Unless the librarian had given special permission, no one was allowed to take original maps outside the room. One student received an approval message and assumed that it also allowed him to photograph and remove every item. Staff clarified that the message covered room access, not unlimited document use. The library advised students to read the conditions carefully; otherwise, they might arrive without the required booking or misunderstand the rules. The library was open during its regular hours while the research room followed separate conditions.

問9. What was required before anyone could use the research room?

A. A paid museum ticket ／ B. Approval of an application ／ C. A school exam score ／ D. An invitation from a newspaper

問10. What else did approved visitors need to do?

A. Purchase a book ／ B. Join the staff ／ C. Reserve a time slot ／ D. Attend a bus tour

問11. Under what condition could students use old maps?

A. Under staff supervision ／ B. After taking them home ／ C. Only at midnight ／ D. Without any restrictions

問12. When could someone remove original maps from the room?

A. Whenever they wished ／ B. After registration only ／ C. After paying a fee ／ D. Only with special permission

問13. What did the approval message actually cover?

A. Unlimited photography ／ B. Room access ／ C. Removal of all maps ／ D. A guaranteed desk at any time

問14. Why was the student’s assumption wrong?

A. The library had closed ／ B. The maps did not exist ／ C. Room approval did not permit every use ／ D. The student was not a learner

問15. What might happen if students ignored the conditions?

A. They might arrive without the required booking ／ B. They would receive a prize ／ C. All permits would become permanent ／ D. The library would close

問16. Did the entire library follow the research room’s special access rules?

A. Yes, every area ／ B. Yes, during every hour ／ C. Only on weekends ／ D. No

長文2｜学校の国際交流会｜参加条件と例外

Reading passage（慶英会オリジナル）

A junior high school planned an English exchange day with visiting students. Families could attend the opening ceremony only if they had registered before the stated deadline. The afternoon discussion was open to confirmed student participants, provided that they had completed the short preparation activity. Unless a teacher approved an alternative, all discussion groups had to meet in the assigned rooms. The organizers sent room details by email and asked students to read them before arriving. Otherwise, participants might go to the wrong place. A parent asked whether an early registration automatically allowed the family to join the student discussion. The school explained that the family registration covered the opening ceremony, whereas the discussion required separate student confirmation and preparation. Twenty-four students were confirmed for discussion, but only eighteen had completed the preparation by Tuesday. The remaining six were contacted about their next steps. The school did not claim that those six had been permanently excluded, because the preparation deadline had not yet passed.

問17. What was necessary for a family to attend the opening ceremony?

A. A scholarship ／ B. Registration before the deadline ／ C. A library card ／ D. Completion of a science experiment

問18. What was required for confirmed students to join discussion?

A. An adult ticket ／ B. A museum pass ／ C. Completing the preparation activity ／ D. Owning a digital camera

問19. When could a group meet somewhere other than its assigned room?

A. If a teacher approved an alternative ／ B. Whenever anyone preferred ／ C. Only after the event ／ D. Without telling anyone

問20. Why did the organizers tell students to read room details?

A. For a prize ／ B. To change the event date ／ C. To reduce the number of guests ／ D. To avoid going to the wrong place

問21. Did family registration cover the afternoon student discussion?

A. Yes, always ／ B. No ／ C. Only on Friday ／ D. Every family received access

問22. How many discussion students were confirmed?

A. 18 ／ B. 6 ／ C. 24 ／ D. 30

問23. How many had completed preparation by Tuesday?

A. 18 ／ B. 24 ／ C. 6 ／ D. 30

問24. What was true of the remaining six?

A. They were permanently banned ／ B. They had all left school ／ C. They had won a prize ／ D. They still had time before the deadline

長文3｜科学館の予約メール｜条件付きの特別実験

Reading passage（慶英会オリジナル）

A science museum offered a weekend laboratory workshop with twenty seats. Families could request places online, but the museum confirmed a place only if a booking was accepted and a confirmation email had been sent. A request without confirmation did not guarantee admission. Participants were allowed to use the laboratory equipment provided that they listened to the safety instructions and wore the required protective items. Unless the instructor gave a specific exception for a suitable reason, participants had to remain with their assigned group. The workshop began at 10:30 a.m. Organizers advised visitors to arrive at least fifteen minutes early; otherwise, they might miss the initial safety briefing. By Friday, the museum had received twenty-seven requests and confirmed twenty places. The seven other applicants were placed on a waiting list. One family misunderstood the waiting-list email as an approval. Staff explained that the email reported the current status and did not make an offer of a seat. If a place opened, the museum would send a new message.

問25. What was the workshop’s maximum number of seats?

A. 15 ／ B. 20 ／ C. 27 ／ D. 7

問26. What confirmed a place?

A. An online request alone ／ B. A museum visit ／ C. An accepted booking and confirmation email ／ D. A visitor’s phone call

問27. When could students use laboratory equipment?

A. After following safety and protective requirements ／ B. Whenever they chose ／ C. After the workshop ／ D. Without supervision

問28. When could assigned-group arrangements change?

A. For anyone at any time ／ B. If a guest asked ／ C. After lunch automatically ／ D. If an instructor granted a specific exception

問29. What time did the workshop begin?

A. 10:15 a.m. ／ B. 10:30 a.m. ／ C. 10:45 a.m. ／ D. 11:00 a.m.

問30. What was the recommended latest arrival time?

A. 10:30 a.m. ／ B. 10:45 a.m. ／ C. 10:15 a.m. ／ D. 11:15 a.m.

問31. How many applicants were waitlisted?

A. 7 ／ B. 20 ／ C. 27 ／ D. 15

問32. What did a waiting-list email mean?

A. A confirmed seat ／ B. A free membership ／ C. A cancellation of the event ／ D. No seat had yet been offered

長文4｜地域交通の変更｜必要条件を読み違えない

Reading passage（慶英会オリジナル）

A community center introduced a new event-day shuttle connecting a station with a local nature park. Visitors could use the free shuttle only if they had registered for the nature event and received the shuttle booking code. However, receiving a code did not guarantee that a late passenger could board a departure that had already left. The shuttle normally stopped at the west exit, unless road repairs required a change. On Thursday, the operator announced that the Saturday pickup point would move to the north exit because of maintenance. The service would run at 9:00 and 9:30 a.m., provided that weather and road conditions allowed safe operation. The organizers told registered visitors to read the updated notice; otherwise, they might wait at the old west-exit stop. One family interpreted the registration condition as permission to board any bus operated in town. Staff clarified that the code applied to this event shuttle only, not regular public buses. The shuttle was expected to carry thirty visitors across the two trips, but the final attendance had not yet been recorded.

問33. What was required to use the free event shuttle?

A. A railway season pass ／ B. Event registration and shuttle booking code ／ C. A library ID only ／ D. A museum ticket bought on the day

問34. Where was the normal pickup point?

A. North exit ／ B. South exit ／ C. West exit ／ D. East exit

問35. Where would the Saturday pickup point be?

A. North exit ／ B. West exit ／ C. Station platform 2 ／ D. Museum entrance

問36. Why was the pickup point moved?

A. Higher ticket prices ／ B. An earlier bus ／ C. A new event date ／ D. Maintenance work

問37. What were the planned departure times?

A. 8:00 and 8:30 ／ B. 9:00 and 9:30 ／ C. 9:30 and 10:00 ／ D. 10:00 and 10:30

問38. What condition could affect whether the shuttle ran?

A. Student grades ／ B. The museum’s newsletter ／ C. Weather and road safety ／ D. An unrelated exam

問39. Did the event code cover normal public buses?

A. No ／ B. Yes ／ C. Only after lunch ／ D. Only for children

問40. Had the final number of riders been recorded?

A. Yes, exactly thirty ／ B. Yes, sixty ／ C. All trips had finished ／ D. No

復習｜条件を満たしたから確定とは限らない

• only ifで示された必要条件を本文から抜き出す。
• provided thatで追加された条件を確認する。
• unlessで示される例外条件と通常の扱いを分ける。
• otherwiseで説明される結果が「必ず」か「可能性」かも確認する。
• 翌日と1週間後に32問を再演習し、どの条件を見落としたか説明する。

FAQ

only ifとifはどう違いますか？

ifはある条件なら結果が成立するという関係を示し、only ifはその条件が必要であることを強調します。only ifだけでほかの条件が不要だとは限りません。

unlessはif notと同じですか？

多くの条件文で近い意味ですが、文脈によって言い換えの自然さが異なる場合があります。元の文の条件の範囲を維持してください。

otherwiseは接続詞ですか？

ここでのotherwiseは接続副詞で、前の文の指示をしなかった場合に起こり得る結果を示します。

関連する無料教材

• license・permit・certificate・registration｜登録と許可の40問
• comply with・violate・exempt from｜規則・例外の40問
• although・despite・whereas・nevertheless｜逆接・対比の40問

英検準2級プラスの条件表現とNEW TREASUREの英文法・定期テスト対策を一緒に強化したい方は、慶英会の最大1か月無料体験・学習相談をご確認ください。教材は無料・申込不要です。

公式参考：日本英語検定協会「準2級プラスの試験内容」。施設・規則・英文・問題・全解答・全文和訳は慶英会独自の学習用素材です。

最大1か月完全無料体験・学習相談受付中

最大1か月の完全無料体験をご案内
学校教材・学力・目標に合わせた個別指導

入塾前に授業の進め方や講師との相性をお確かめください。

学校英語・定期テスト・英検の学習相談にも対応します。
保護者様の教育相談も無料で承ります。

1.学年 2. 学習目標　3.体験ご希望をお送りください。

体験の期間・回数・担当講師・日程は、ご希望と受付状況を確認してご案内します。

公式LINEで無料体験・学習相談Webフォームで無料体験・学習相談料金・無料体験の条件を確認する

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