【論文で使える】学術英語表現集｜IMRAD別定型フレーズ
学術論文で使われる英語表現には独特のパターンがあります。本記事では、論文の各セクションで使える定型表現、避けるべき表現、そして日本人研究者がよく間違える表現を詳しく解説します。
学術英語の特徴
| 特徴 | 一般英語 | 学術英語 |
|---|---|---|
| 文体 | カジュアル、口語的 | フォーマル、客観的 |
| 人称 | I, you を多用 | we, 受動態、非人称構文 |
| 動詞 | 句動詞（phrasal verbs） | ラテン語由来の動詞 |
| 表現 | 直接的、断定的 | ヘッジング（hedging）を多用 |
| 語彙 | 日常語 | 専門用語、学術用語 |
Introduction で使える表現
研究背景を述べる
| 目的 | 英語表現 |
|---|---|
| 一般的事実 | It is well established that… It is widely recognized that… It has been shown that… |
| 重要性 | X plays a crucial role in… X is essential for… X has attracted considerable attention… |
| 先行研究 | Previous studies have demonstrated that… Recent research has shown that… Several studies have reported that… |
| 問題提起 | However, little is known about… Despite its importance, X remains unclear. There is limited research on… |
研究目的を述べる
推奨表現:
- The aim of this study was to investigate…
- This study aimed to examine…
- The purpose of this research was to determine…
- We sought to clarify…
- The present study was designed to evaluate…
Methods で使える表現
研究デザイン
| 内容 | 英語表現 |
|---|---|
| 対象 | A total of X patients were enrolled… Participants were recruited from… The study population consisted of… |
| 除外基準 | Patients were excluded if they… Exclusion criteria included… We excluded patients with… |
| 手順 | X was performed according to… Samples were collected and processed… Data were obtained by… |
| 統計 | Statistical analyses were performed using… Data were analyzed by… P values less than 0.05 were considered significant. |
時制の使い分け
Methods セクションの時制:
- 過去形: 実際に行った手順（We collected samples…）
- 過去形受動態: 一般的な方法（Samples were analyzed…）
- 現在形: 普遍的な事実（This method allows…）
Results で使える表現
結果を報告する
| 内容 | 英語表現 |
|---|---|
| 増加 | X increased significantly (P < 0.05). A significant increase was observed in… X showed a marked increase… |
| 減少 | X decreased by 25%. A significant reduction was found in… X was significantly lower in… |
| 差がない | No significant difference was observed between… X did not differ significantly… There was no statistically significant difference… |
| 相関 | X was positively correlated with Y (r = 0.75). A significant correlation was found between… X was associated with… |
| 図表参照 | As shown in Figure 1… Table 2 summarizes… These results are presented in… |
数値の表現
数値表現のポイント:
- 平均±標準偏差: mean ± SD (25.3 ± 4.2)
- 中央値と四分位範囲: median (IQR) [12.5 (8.3-16.7)]
- 割合: percentage (%) [45.2%]
- P値: P < 0.05, P = 0.032
- 信頼区間: 95% CI [1.2-3.4]
Discussion で使える表現
結果の解釈
| 目的 | 英語表現 |
|---|---|
| 主要な発見 | The main finding of this study was that… Our results demonstrated that… The present study revealed that… |
| 先行研究との比較 | These findings are consistent with… Our results are in line with… In contrast to previous studies… |
| 解釈 | These results suggest that… This finding may be explained by… One possible explanation is that… |
| 限界 | This study has several limitations. A limitation of this study is… The small sample size limits… |
| 結論 | In conclusion, our findings indicate that… Taken together, these results suggest… Our study provides evidence that… |
ヘッジング（Hedging）表現
学術論文では断定を避け、控えめな表現を使うことが重要です。
ヘッジング表現の種類
| 種類 | 表現例 | 強さ |
|---|---|---|
| 助動詞 | may, might, could, would | 弱い |
| 動詞 | suggest, indicate, appear, seem | 中程度 |
| 副詞 | possibly, probably, likely, perhaps | 弱い〜中程度 |
| 形容詞 | possible, probable, likely | 中程度 |
| 名詞 | possibility, probability, tendency | 中程度 |
ヘッジングの使い方
避けるべき表現（断定的すぎる）:
- This proves that X causes Y.
- X definitely leads to Y.
- We have shown that X is true.
推奨表現（適度なヘッジング）:
- This suggests that X may contribute to Y.
- X appears to be associated with Y.
- Our findings indicate that X could play a role in…
日本人研究者がよく間違える表現
冠詞（a, an, the）の誤用
| 誤り | 正しい表現 | 説明 |
|---|---|---|
| We investigated effect of X. | We investigated the effect of X. | 特定の効果には the が必要 |
| Patient was treated with… | The patient was treated with… | 特定の患者には the が必要 |
| This is important finding. | This is an important finding. | 単数可算名詞には冠詞が必要 |
単数・複数の誤り
| 誤り | 正しい表現 | 説明 |
|---|---|---|
| These data shows… | These data show… | data は複数形 |
| The criteria is… | The criteria are… | criteria は複数形 |
| Many researches… | Many studies… | research は不可算名詞 |
| informations | information | information は不可算名詞 |
前置詞の誤り
| 誤り | 正しい表現 |
|---|---|
| consist in | consist of |
| depend of | depend on |
| result to | result in |
| different with | different from |
| associated to | associated with |
避けるべき表現
口語的・非学術的表現
| 避けるべき表現 | 代替表現 |
|---|---|
| a lot of | many, numerous, substantial |
| get | obtain, acquire, receive |
| find out | determine, identify, discover |
| look at | examine, investigate, analyze |
| go up / go down | increase / decrease |
| big / small | large, substantial / minor, minimal |
| kind of / sort of | somewhat, relatively |
| etc. | among others, and so forth |
接続表現（Transition Words）
論理的なつながりを示す表現
| 機能 | 表現 |
|---|---|
| 追加 | Furthermore, Moreover, In addition, Additionally |
| 対比 | However, In contrast, On the other hand, Nevertheless |
| 因果 | Therefore, Thus, Consequently, As a result |
| 例示 | For example, For instance, Specifically |
| 要約 | In summary, In conclusion, Taken together |
| 強調 | Indeed, Importantly, Notably, Of note |
よくある質問（FAQ）
Q: 一人称（I, We）は使っていいですか？
A: 多くのジャーナルでは “We” の使用が認められています。ただし、受動態が好まれるジャーナルもあるため、投稿規程を確認してください。単著の場合でも “We” を使うことが一般的です。
Q: 略語はどこで定義すべきですか？
A: Abstract と本文で別々に定義します。初出時にフルスペルを書き、括弧内に略語を記載します。例: polymerase chain reaction (PCR)
Q: 数字は数字で書くべきですか、スペルアウトすべきですか？
A: 一般的に、文頭の数字と1-9はスペルアウト、10以上は数字で書きます。ただし、単位を伴う場合は常に数字を使用します（例: 5 mL）。
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EditVerse Japanでは、学術英語に精通したネイティブエディターが、正確で自然な英語表現への修正を行います。冠詞、前置詞、時制など日本人研究者が苦手とするポイントを重点的にチェックし、採択率向上をサポートします。
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