GRAMMAR DETAIL
〜をもとに
Indicates using existing material or experience as the basis for a new judgment or creation.
Examples
住民の提案をもとに、新しい広場を設計した。
A new plaza was designed based on proposals from residents.
Words used
過去の経験をもとに、次の案を作った。
I developed the next proposal based on past experience.
Words used
この映画は、実際の事件をもとに作られた。
This movie was based on an actual incident.
Words used
Study notes
1. Origins, structure, and basic meaning
- Structure: Attach
をもとにto a noun for material or experience used as the basis for creating something new. - Basic usage:
この映画は、実際の事件をもとに作られた。identifies an actual incident as the source material for a film.
2. Common pitfalls and similar expressions
- Source material versus a governing basis
事件をもとに映画を作るuses an incident as creative material, whereas規則に基づいて判断するuses rules as the basis for a judgment. Both express a basis, but the emphasis differs between material and grounds.
- Modifying a noun
- To modify a following noun, use a form such as
経験をもとにした案, connecting it withした.
- To modify a following noun, use a form such as

