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英語論文のDiscussionで使える動詞と助動詞:確信の度合いに応じた選択と使い分け

英語原著論文で実験結果を伝えるときに、どれだけ強い主張をしていいかは、どれくらい強いエビデンスがあるかで決まります。論文を投稿しても査読者に、それは言いすぎだろ!トーンダウンするか実験的証拠を見せろといわれるのは日常的に起こります。追加実験したくなければ、エビデンスの強さに合わせた適度な表現を身に付ける必要があります。動詞、助動詞、副詞をうまく選んで、確信の度合いを適切に表現したいものです。

確信の程度に応じた動詞の使い分け

The words “demonstrate,” “show,” “indicate,” “imply,” and “suggest” represent different levels of confidence or certainty in a statement or assertion. Here is the order of confidence from the strongest to the weakest, along with examples:

  1. Demonstrate: This word indicates a very high level of confidence. When you say something is “demonstrated,” you are asserting that there is clear and unequivocal evidence to support your claim.Example: “Numerous scientific studies demonstrate that smoking is a major risk factor for lung cancer.”
  2. Show: “Show” also suggests a high degree of confidence, although it may be slightly less strong than “demonstrate.” When you say something is “shown,” you are asserting that there is strong and compelling evidence.Example: “The data from the experiment show a strong correlation between the two variables.”
  3. Indicate: “Indicate” is a word that suggests moderate confidence. It implies that there is evidence or signs that point in a certain direction, but there may be room for interpretation.Example: “The preliminary results of the study indicate a possible link between diet and heart health.”
  4. Imply: “Imply” implies a lower level of confidence. It suggests that there are suggestions or hints, but the evidence is not strong or definitive.Example: “His comments during the interview imply that he may be considering a career change, but it’s not clear.”
  5. Suggest: “Suggest” is the least confident of these words. It indicates a weak or speculative connection and implies that there may be multiple possible interpretations.Example: “The results of the survey suggest that public opinion on this issue is divided, but further research is needed to confirm.”

These words convey different degrees of certainty in your statements, and it’s important to choose the one that accurately reflects the strength of your evidence or the level of confidence you have in your assertion.

確信の程度に応じた助動詞の使い分け

In scientific research papers, the choice of auxiliary verbs can convey the degree of certainty associated with your findings and assertions. Here are some common auxiliary verbs used in accordance with the degree of certainty:

  1. High Certainty:
    • Can/Could: These auxiliary verbs indicate that the findings are based on strong evidence or are highly likely.
      • Example: “The results of the controlled experiments can accurately predict the behavior of this material under different conditions.”
  2. Moderate Certainty:
    • May/Might: These auxiliary verbs suggest that the findings are plausible but not entirely conclusive.
      • Example: “The data suggest that the new treatment approach may be effective in reducing symptoms.”
  3. Low Certainty:
    • Seem/Appear: These auxiliary verbs convey a sense of uncertainty and suggest that the findings are preliminary or based on limited evidence.
      • Example: “Based on the available data, it appears that there is a correlation between these two variables, but further research is needed to confirm.”
  4. No Certainty (Hypothetical or Speculative):
    • Would/Should: These auxiliary verbs indicate that the findings are based on hypothetical or speculative scenarios.
      • Example: “In theory, if the model is accurate, this material should exhibit these properties under extreme conditions.”

It’s important to choose auxiliary verbs that accurately reflect the level of confidence in your scientific research paper. Overstating or understating certainty can lead to misunderstandings or misinterpretations of your findings. Additionally, the use of these auxiliary verbs can help you maintain a cautious and objective tone in scientific writing.

確信の程度に応じた副詞の使い分け

In scientific research papers, adverbs and adverb phrases can be used to convey the degree of certainty or uncertainty associated with your findings and assertions. Here are examples of adverbs and adverb phrases that can be used in accordance with the degree of certainty:

  1. High Certainty:
    • Definitely: This adverb expresses a high level of certainty.
      • Example: “The results definitely confirm the hypothesis.”
    • Certainly: This adverb indicates strong confidence.
      • Example: “The evidence certainly supports the theory.”
    • Without a doubt: This phrase emphasizes the absolute certainty of a statement.
      • Example: “Without a doubt, the data show a significant correlation.”
  2. Moderate Certainty:
    • Likely: This adverb suggests a reasonable degree of confidence.
      • Example: “It is likely that the new treatment will improve patient outcomes.”
    • Probably: This adverb implies a moderate level of probability.
      • Example: “The model probably underestimates the true value due to a small sample size.”
    • Possibly: This adverb indicates that an outcome is plausible but not certain.
      • Example: “It is possibly related to changes in environmental conditions.”
  3. Low Certainty:
    • Potentially: This adverb suggests that something is a possibility but not confirmed.
      • Example: “The observed changes are potentially caused by external factors.”
    • Hypothetically: This adverb implies that the statement is based on a theoretical or speculative scenario.
      • Example: “Hypothetically, if this trend continues, it may lead to unexpected consequences.”
  4. No Certainty (Hypothetical or Speculative):
    • If/Suppose/Assuming: These adverb phrases are used to introduce hypothetical or speculative scenarios.
      • Example: “If this interpretation is correct, it would explain the observed results.”
    • In theory: This phrase suggests that something is theoretically possible but not confirmed.
      • Example: “In theory, these particles should interact in this manner under specific conditions.”

The choice of adverbs and adverb phrases is crucial in maintaining the appropriate level of caution and objectivity in scientific writing. Using these words and phrases can help you accurately convey the degree of certainty associated with your research findings.

他にも、evidentlyやnotablyといった単語も使えます。

(参考:chat.openai.com)

理由を表す英語表現due toの正しい用法

~のせいで、~した。と言いたいときにdue toがよく使われますが、誤った使い方も多いようです。英米でも間違った使い方をする人が増えた結果、今では間違いではないという風潮すら出てきているようです。

 

理由を表すdue to は形容詞句

 

due to は形容詞句なので、副詞句としては使えません。

副詞的な使い方をしてしまっている誤用の例文:

The road is closed due to flooding. 洪水のため道路は閉鎖されている。

「洪水のため」というのは副詞的な用法ですが、due toは副詞として使えないので間違いです。正しくは、副詞句であるowing toを使って、

The road is closed owing to flooding.

とすべきだと、このブログ記事に書いてありました。このブログ記事の解説は秀逸だと思います。due toの正しい使い方に関する説明は自分もいろいろ探し求めて読んできましたが、以下の説明が一番わかりやすいと思いました。

For the road to be “due to” anything, it would have to be something that influenced the existence of the road: The road was due to the efforts of local citizens who voted to raise taxes for its construction.

(“Owing to” vs “Due to” By Maeve Maddox DailyWritingTips)

上の説明を日本語に訳しておきます。

「道路」がなにがしかの「due」であるためには、そのなにがしかが道路の存在に影響を与えたものになっていないといけない:その道路は、建設のために税金を値上げすることに投票した地域住民らの努力によるものである。

 

別のブログ記事から対比がわかりやすい例を紹介します。

正しい用例 His frustration was due to the mucked up windscreen.
誤った用例 He was frustrated due to the mucked up windscreen.

“Because Of” and “Due To” By Guest Author DailyWritingTips)

上のほうの文はdue to は形容詞句であり文の要素としては「補語」になっています。下のほうの文は明らかに副詞句として使われており、それは誤用です。

 

医科学論文における用例

Global deaths from cardiovascular disease increased by 41% between 1990 and 2013 despite a 39% decrease in age-specific death rates; this increase was driven by a 55% increase in mortality due to the aging of populations and a 25% increase due to population growth. (https://www.nejm.org/doi/full/10.1056/NEJMoa1406656)

The drug did not prevent clinical progression in a trial involving patients with mild-to-moderate dementia due to Alzheimer’s disease. (https://www.nejm.org/doi/full/10.1056/NEJMoa1812840)

 

予定を表すbe due to

理由を表すdue to とは別に考えないといけないのがbe due toという慣用表現です。これは予定を表すもので、理由をあらわすdue toとは別物です。

  1. https://eow.alc.co.jp/search?q=due+to

 

参考

  1. “Owing to” vs “Due to” By Maeve Maddox DailyWritingTips