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原田英語の時事英語ジュニア｜英語ニュース ワークシート（中学生レベル）

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生成AIで力はつく？弁護士の3か月の実験、AIなしでも伸びていたのはベテランだけ

Does AI Make You Better at Your Job?

音声・ゲームはこちらから

1Working with AI made experienced lawyers more skilled, even without AI, a new study suggests. Beginners did not gain in the same way.

2Researchers in the U.S. studied 133 lawyers for three months. The lawyers write documents to protect new inventions. About two-thirds of them were given an AI writing tool. The others worked without it.

3The lawyers with AI wrote better documents. Then, after three months, everyone did a task without AI. Experienced lawyers who had used AI did better than those who had not. But on average, less experienced lawyers who had used AI did not do better.

4The researchers said people may need basic skills first to learn from AI. The study looked only at lawyers, not students. It has not yet been checked by other scientists.

Words　単語

experiencedB1形経験のある、ベテランのhaving done something for a long time
beginnersA2名初心者（beginner の複数形）people who are just starting to learn
lawyersA2名弁護士（lawyer の複数形）people whose job is to help others with the law
documentsB1名書類、文書（document の複数形）papers or files with written information
inventionsA2名発明（したもの）（invention の複数形）new things that someone made for the first time
toolA1名道具a thing you use to help you do work
averageA2名平均the usual amount when you look at a whole group
basicA2形基本のsimple and needed first

単語のレベル：CEFR-J（『CEFR-J Wordlist Version 1.6』 東京外国語大学投野由紀夫研究室. （URL: https://www.cefr-j.org/download.html より 2026年8月ダウンロード））

1. Reading Quiz　本文の内容に合うものを選ぼう

  1. How many lawyers did the researchers study?

    A. 13B. 133C. 300D. 1,333

  2. What happened after three months?

    A. Everyone got a new AI tool.B. The lawyers stopped working.C. Everyone did a task without AI.D. The students took a test.

  3. Who did better on the task without AI?

    A. Experienced lawyers who had used AIB. Less experienced lawyers who had used AIC. Lawyers who had never written documentsD. Students who used AI

  4. What is true about the study?

    A. It studied high school students.B. It lasted one year.C. Other scientists have already checked it.D. It looked only at lawyers.

2. True or False　正しければ T、違っていれば F

  1. (     ) About two-thirds of the lawyers were given an AI writing tool.

  2. (     ) The lawyers with AI wrote worse documents.

  3. (     ) On average, less experienced lawyers who had used AI did not do better on the task without AI.

  4. (     ) The researchers said people do not need basic skills to learn from AI.

3. Fill in the Blanks　下の語から選んで空らんをうめよう（形を変えずに）

experiencedtooldocumentsBeginnersaveragelawyers

  1. But on _____, less experienced lawyers who had used AI did not do better.

  2. The lawyers write _____ to protect new inventions.

  3. _____ did not gain in the same way.

  4. Researchers in the U.S. studied 133 _____ for three months.

  5. Working with AI made _____ lawyers more skilled, even without AI, a new study suggests.

  6. About two-thirds of them were given an AI writing _____.

4. Word Order　語を並べかえて正しい文にしよう

  1. ( The / lawyers / AI / wrote / better / with / documents ) .

  2. ( not / study / only / The / at / students / lawyers, / looked ) .

  3. ( U.S. / in / Researchers / the / studied / for / lawyers / three / 133 / months ) .

5. Think and Write　英語で答えてみよう

  1. How do you use AI when you study?（あなたは勉強するとき、AIをどのように使っていますか？）

  2. Do you think you learn more when you do homework without AI? Why?（AIを使わずに宿題をするほうが、よく身につくと思いますか？それはなぜ？）

Answers　解答

1. (1) B　(2) C　(3) A　(4) D

2. (1) T　(2) F　(3) T　(4) F

3. (1) average　(2) documents　(3) Beginners　(4) lawyers　(5) experienced　(6) tool

4.

  1. The lawyers with AI wrote better documents.
  2. The study looked only at lawyers, not students.
  3. Researchers in the U.S. studied 133 lawyers for three months.

全文訳

1AIといっしょに働くと、経験のある弁護士は、AIがなくても腕が上がっていたことが、新しい研究で示されました。初心者は、同じようには伸びていませんでした。

2アメリカの研究者たちは、133人の弁護士を3か月間調べました。この弁護士たちは、新しい発明を守るための書類を書いています。そのうち約3分の2の人が、文章を書くAIの道具をもらいました。残りの人は、AIを使わずに仕事をしました。

3AIを使った弁護士は、よりよい書類を書きました。そして3か月後、全員がAIを使わずに課題に取り組みました。AIを使っていた経験の長い弁護士は、使っていなかった人よりよい結果を出しました。でも平均すると、AIを使っていた経験の短い弁護士は、よい結果を出しませんでした。

4研究者たちは、AIから学ぶには、まず基本の力が必要なのかもしれないと述べました。この研究が調べたのは弁護士だけで、学生ではありません。また、ほかの科学者によるチェックはまだ受けていません。

文法ポイント：過去完了（had＋過去分詞）

過去のある時点より前に起きたことは had＋過去分詞で表す。本文の Experienced lawyers who had used AI did better than those who had not. は、「AIなしの課題をした」時点より前の3か月間に AI を使っていた、という意味。

出典：National Bureau of Economic Research (NBER)、PsyPost ほか（記事は原田英語の時事英語ジュニアのオリジナル）｜https://www.haradaeigo.com/jijieigo-junior/news/2026-11-09-ai-skills-experts-study/