英検1級語彙の語形変化を見抜く｜-tion・-ity・-ive・-alで品詞を確定する独自36問

2026年11月3日

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

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英検1級の語彙問題では、4つの選択肢がすべて意味の近い語族になっていることがあります。そのとき重要なのが、空所に必要な品詞を見抜くことです。この記事では、-tion・-ity・-ive・-alなどの語尾を手掛かりに、名詞・形容詞・副詞・動詞の形を確定する独自36問を掲載します。

語形は「意味」より先に確認する

例えば「The policy has a significant ___ on employment.」なら、has a significantの後に必要なのは名詞なのでeffectが候補になります。4択を全部和訳する前に、空所の前後から品詞を決めると処理が速くなります。

よく出る語尾

-tion / -sion：名詞
-ity：名詞
-ive：形容詞
-al：形容詞・一部名詞
-ly：副詞

独自36問

The committee reached a final (decision / decisive / decide) after discussion.
The report provides a detailed (description / descriptive / describe) of the process.
The policy is highly (effective / effectiveness / effectively).
The researchers examined the economic (stability / stable / stabilize) of the region.
The government announced a major (reduction / reductive / reduce) in emissions.
The proposal received widespread (approval / approve / approving).
The company responded (promptly / prompt / promptness) to the request.
The study found a significant (difference / different / differently) between groups.
The system improved operational (efficiency / efficient / efficiently).
The report emphasizes the (importance / important / importantly) of training.
The researchers made a careful (assessment / assess / assessable) of the risks.
The policy was introduced to improve public (safety / safely / safe).
The company experienced rapid (expansion / expansive / expand).
The findings were independently (verified / verification / verifiable).
The government took immediate (action / active / actively).
The organization needs greater financial (stability / stable / stabilize).
The researchers worked (collaboratively / collaborative / collaboration) with hospitals.
The proposal was considered economically (feasible / feasibility / feasibly).
The study offers a useful (explanation / explanatory / explain).
The program achieved measurable (improvement / improved / improve).
The committee requested additional (information / informative / inform).
The company has a strong (presence / present / presently) in Asia.
The report was widely (criticized / criticism / critical).
The policy could have serious social (consequences / consequential / consequently).
The researchers identified a possible (connection / connected / connect).
The project requires careful (preparation / preparatory / prepare).
The new system operates more (reliably / reliable / reliability).
The organization demonstrated considerable (flexibility / flexible / flexibly).
The reform created a new (opportunity / opportunistic / opportunely) for investment.
The report contains substantial (evidence / evident / evidently).
The committee reached a (consensus / consensual / consensually).
The company improved customer (satisfaction / satisfactory / satisfy).
The study examined the long-term (sustainability / sustainable / sustainably).
The researchers presented a (convincing / conviction / convincingly) explanation.
The government seeks greater policy (consistency / consistent / consistently).
The program has significant educational (value / valuable / valuably).