1. Basic structure
| Form | Structure | Meaning | Example |
|---|
| Noun + の下で | N + の下で | Under..., under the management/guidance/influence of... | 先生 の下で研究している。 |
| Noun + のもとで | N + のもとで | Under..., under the control/protection of... | 法律 のもとで平等でなければならない。 |
2. Core meaning & detailed analysis
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Indicates the environment, condition, or influence within which an action/event takes place.
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Means “under,” “under the management/influence of...” – commonly used with nouns for people, organizations, laws, protection.
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の下で (のもとで): Emphasizes direct instruction, guidance, or influence by people (teachers, doctors, coaches, etc.).
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のもとで (のもとで): More formal; emphasizes scope, conditions, or principles (law, peace, government, etc.).
3. Illustrative examples
- 有名な教授 の下で研究ができて幸せだ。
I'm fortunate to be able to conduct research under the guidance of a famous professor. - 両親 の下で、愛情いっぱいに育てられた。
I was raised under the loving care of my parents. - このプロジェクトは市長 の下で進められている。
This project is being carried out under the mayor's direction. - 日本では、すべての人が法律 のもとで平等である。
In Japan, everyone is equal under the law. - 平和 のもとで暮らせることに感謝している。
I am grateful to be able to live in peace.
4. Usage & nuance
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の下で is often used for specific people or direct supervision: “under the teaching of...,” “under the leadership of...”.
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のもとで is used for laws, policies, broad/abstract conditions: “under the law,” “under a peaceful sky...”.
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Register: Formal; common in writing, speeches, journalism, JLPT N2~N1.
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Not used in casual conversation when simply saying “under the tree” → use ～の下に (物理).
5. Comparison, distinctions, and similar patterns
| Pattern | Meaning | Key difference | Example |
|---|
|
～の下で | Under the direction/guidance of... | Direct influence from an individual or organization. | 先生 の下で学ぶ。 |
|
～のもとで | Under (the law/scope/conditions) of... | More general, legal, normative. | 法律 のもとで守られている。 |
| ～に従って | According to, in accordance with... | Emphasizes following rules/a process of change. | 指示に従って動く。 |
| ～のもとに | Based on..., in the name of... | Close to のもとで but carries the sense of “based on a reason.” | 愛 のもとに結婚した。 |
6. Additional notes
- Remember: の下で = direct influence, のもとで = broad environment/rules.
- In legal contexts, it expresses “everyone is equal under...,” so it's very common on the JLPT.
- For everyday physical meanings like “under a tree, under a table,” don't use this pattern.
7. Variations & set phrases
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～の指導の下で：Under the direction/guidance of...
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～の保護のもとで：Under the protection of...
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～の監督の下で：Under the supervision of...
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憲法のもとで：Under the constitution...
8. Common mistakes & JLPT traps
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Confusing it with the physical meaning (under the table, under a tree, etc.) → this pattern is not used for that meaning.
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Using it in everyday speech sounds unnatural, so use it in writing, news, essays.
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Omitting の after a noun → ungrammatical (の is required).
