〜を基に

§ What does it mean and when do people use it?

The Japanese phrase "〜を基に" (o moto ni) is super useful for expressing that something is "based on," "founded on," or "on the basis of" something else. Think of it as laying a foundation. When you use this phrase, you're indicating that whatever comes after it is derived from, built upon, or inspired by the information, idea, or object that comes before it.

Definition

Based on, founded on, on the basis of.

You'll hear and read "〜を基に" a lot in various contexts, from daily conversations to more formal settings. It's a versatile phrase that allows you to clearly state the origin or underlying principle of something. Here are some common situations where you'd use it:

• When talking about decisions or plans: You can use it to explain what information or principles a decision was made on. For example, a company might make a new marketing strategy "based on" market research.
• When describing creations or designs: If an artist creates a sculpture "based on" a historical event, or a developer builds software "based on" user feedback, this phrase fits perfectly.
• When referring to learning or studies: A student might write a report "based on" a scientific study, or a teacher might create a lesson plan "based on" a specific curriculum.
• When discussing theories or hypotheses: Scientists often propose new theories "based on" existing data or observations.
• When making a judgment or evaluation: You might form an opinion "based on" someone's past actions or a set of facts.

Let's look at a few examples to get a better feel for it:

Understanding the nuance of "〜を基に" can significantly improve your ability to express complex ideas in Japanese. It helps you articulate not just what something is, but also its origins and underlying influences. It's a staple in both spoken and written Japanese, making it an essential phrase for anyone learning at an intermediate level.

The Japanese phrase 〜を基に (〜を もとに) means "based on," "founded on," or "on the basis of." It's a useful phrase for explaining that something was created, developed, or decided using certain information, data, or principles as a foundation.

§ Basic Grammar

The structure is generally: [Noun] + を基に + [Verb/Noun]. The noun before を基に is the basis or foundation for the action or thing that follows.

§ Examples with Nouns

DEFINITION

When used with a noun, it directly states what something is based on.

• この計画 (この けいかく): This plan
• 過去のデータ (かこ の データ): Past data
• 作られました (つくられました): Was made/created

Translation Hint: This plan was created based on past data.

• 彼の小説 (かれ の しょうせつ): His novel
• 実話 (じつわ): True story
• している: Is doing/is based

Translation Hint: His novel is based on a true story.

§ Usage with Clauses or Sentences

DEFINITION

When you want to base something on a longer idea or event, you can often turn that idea into a noun phrase by using the plain form of a verb followed by こと or の, then attach を基に.

• お客様の意見 (おきゃくさま の いけん): Customer's opinions
• 聞いたこと (きいた こと): The fact that we heard
• サービスを改善しました (サービス を かいぜん しました): Improved the service

Translation Hint: Based on hearing customer opinions, we improved the service.

§ Common Nouns Used with 〜を基に

Here are some nouns that frequently appear with 〜を基に:

• データ (data): データを基に (based on data)
• 情報 (じょうほう, information): 情報を基に (based on information)
• 事実 (じじつ, fact): 事実を基に (based on facts)
• 経験 (けいけん, experience): 経験を基に (based on experience)
• 調査 (ちょうさ, research/investigation): 調査を基に (based on research)
• 理論 (りろん, theory): 理論を基に (based on theory)

§ を基にした (〜を基にした) as an Adjective

DEFINITION

You can also use 〜を基にした to directly modify a noun, turning the entire phrase into an adjectival clause meaning "[Noun] based [Noun]."

• これは: This is
• 科学的なデータ (かがくてき な データ): Scientific data
• 分析 (ぶんせき): Analysis

Translation Hint: This is an analysis based on scientific data.

• その映画 (その えいが): That movie
• 有名な漫画 (ゆうめい な まんが): Famous manga
• 作品 (さくひん): Work/piece

Translation Hint: That movie is a work based on a famous manga.

§ Don't confuse with 〜に基づいて (ni motozuite)

Many learners get confused between 〜を基に (o moto ni) and 〜に基づいて (ni motozuite). While they both mean 'based on' or 'on the basis of,' there's a subtle but important difference.

DEFINITION

〜を基に (o moto ni) emphasizes the source or foundation from which something is created or developed. It implies using something as a starting point or raw material.

DEFINITION

〜に基づいて (ni motozuite) implies adherence to rules, guidelines, principles, or data. It's about following established criteria or facts.

Think of it this way: you create a new product 〜を基に (o moto ni) your initial idea, but you make decisions 〜に基づいて (ni motozuite) company policy.

§ Incorrectly using particles

The particle 'を' (o) is crucial with 〜を基に. It marks the direct object that serves as the basis. Using other particles like 'に' (ni) or 'で' (de) here would be grammatically incorrect and change the meaning.

Common mistakes often involve:

• Using 'に' instead of 'を': This would make the 'basis' sound like a location or indirect object, which isn't the intended meaning.

• Omitting 'を' entirely: This makes the sentence grammatically incomplete and difficult to understand.

§ Not understanding the nuance of 'creation' or 'development'

While 'based on' is a good general translation, remember that 〜を基に often implies that something new is being created or developed from the stated basis. It's not just about simple reference; it's about using something as fundamental input for output.

Here, the feedback isn't just referenced; it actively informs and drives the improvements to the product. The product is *developed further* using the feedback as its foundation.

§ Overusing it in formal contexts

〜を基に is versatile, but in very formal or academic writing, you might encounter other expressions that convey a similar meaning but with a slightly different nuance or level of formality. While it's generally acceptable, be aware of alternatives for maximum precision in highly formal settings.