Use 基づく to identify the basis of a statement or action.
The idea
基づく is an intransitive godan verb. Mark the basis with に: データに基づく. Use に基づいて before a following action, に基づく before a noun, and に基づいています for an existing basis.
| Dictionary form | Polite non-past | Polite negative | Polite past | て form |
|---|---|---|---|---|
| 基づく | 基づきます | 基づきません | 基づきました | 基づいて |
Examples
- この報告書は調査結果に基づいています。This report is based on survey results.
- データに基づいて計画を立てました。We made the plan based on the data.
- 事実に基づく判断が大切です。A decision based on facts is important.
- この映画は実話に基づいています。The film is based on a true story.
- 規則に基づいて行動してください。Please act in accordance with the rules.
- その主張は証拠に基づいていません。That claim is not based on evidence.
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Watch out
Do not mark the basis with を. 基づいて is the て form, while 基づく directly modifies a noun; 基づいて判断 needs a different construction.
Try it yourself
資料＿基づいて説明します。（に／を）
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に
に marks 資料 as the basis of the explanation.
＿。（基づく→て）
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基づいて
基づいて is the て form: the godan ending く changes to いて.
事実に＿判断です。（基づく／基づいて）
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基づく
基づく directly modifies 判断; 基づいて normally connects to a following clause.
Practice round
Answer questions, then rebuild Japanese sentences where available. We keep your score.
資料＿基づいて説明します。（に／を）
＿。（基づく→て）
事実に＿判断です。（基づく／基づいて）
Tap the words in the right order.
Tap the words in the right order.
Tap the words in the right order.
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Describe a decision based on evidence, then turn it into a noun phrase using に基づく.