~을/를 근거로

The phrase ~을/를 근거로 is an essential linguistic tool in Korean used to indicate the basis, grounds, or evidence for a subsequent statement, decision, or action. In English, it most closely translates to 'based on,' 'on the basis of,' or 'grounded in.' The word 근거 (根據) literally refers to a 'root' (근) and 'to lean on' (거), implying a solid foundation upon which something stands. When you use this phrase, you are signaling to your listener that your conclusion is not arbitrary but is supported by specific facts, data, or logical reasoning. This makes it a staple in professional, academic, and formal contexts where clarity and justification are paramount. For instance, in a legal setting, a judge might make a ruling based on the evidence provided; in a scientific context, a researcher might propose a theory based on experimental results. However, its use is not limited to high-level discourse; it is also frequently used in daily life when someone wants to explain why they think a certain way or why they made a specific choice.

Logical Foundation

This expression highlights the 'why' behind an 'outcome' by pointing to the 'source' of the reasoning. It transforms a simple statement into a reasoned argument.

Formal Nuance

While ~을/를 바탕으로 is more common for creative or developmental foundations, ~을/를 근거로 is preferred when discussing proof, evidence, or objective data.

The power of this phrase lies in its ability to provide credibility. By using it, you are essentially saying, 'I am not just guessing; I have a reason.' This is why you will see it constantly in news reports, where journalists cite sources or statistics to support their claims. It is also vital in debates where participants must ground their arguments in verifiable facts to be persuasive. In everyday Korean, if you ask a friend why they think it will rain and they say, 'I'm saying this based on the weather forecast,' they are using this structure to provide a rational basis for their prediction. It bridges the gap between raw information and meaningful conclusions.

Objective vs. Subjective

This phrase usually introduces an objective source of information, unlike phrases that might introduce personal feelings or intuition.

Furthermore, understanding ~을/를 근거로 is a gateway to higher-level Korean proficiency (B1 and above). It allows learners to move beyond simple 'A and B' or 'A because B' structures into more sophisticated discourse where they can synthesize information. It is often paired with verbs like '판단하다' (to judge), '결정하다' (to decide), '주장하다' (to insist/claim), and '분석하다' (to analyze). By mastering this, you gain the ability to participate in professional discussions, write academic essays, and understand complex news articles that deal with policy, science, and law. It represents a shift from describing what is happening to explaining why it is happening through the lens of evidence.

Using ~을/를 근거로 requires a specific grammatical structure that involves a noun followed by the object particles 을 or 를, depending on whether the noun ends in a consonant or a vowel. The noun represents the evidence or foundation, while the subsequent part of the sentence describes what was done or concluded using that foundation. It is vital to remember that '근거로' acts as an adverbial phrase, modifying the following verb or the entire clause. This structure is incredibly versatile because it can be used to describe past actions, current states, or future plans, all while maintaining a consistent logical flow.

Noun Ending in Consonant

Use '을 근거로'. Example: 사실 (fact) + 을 근거로 = 사실을 근거로 (based on facts).

Noun Ending in Vowel

Use '를 근거로'. Example: 증거 (evidence) + 를 근거로 = 증거를 근거로 (based on evidence).

One of the most common ways to expand this structure is by using the verb form ~에 근거하여 or ~에 근거한. While '~을/를 근거로' is a noun-based adverbial phrase, '~에 근거하여' is a more formal verbal construction that functions similarly. Meanwhile, '~에 근거한' acts as an adjective modifying a noun. For example, '사실에 근거한 이야기' means 'a story based on facts.' Understanding these variations is crucial for achieving natural-sounding Korean in different contexts. When writing a report, you might use '~에 근거하여' to sound more professional, whereas in a conversation about why you chose a certain school, '~을/를 근거로' would be perfectly appropriate.

Another important aspect is the placement of the phrase within the sentence. Usually, it appears early in the sentence to set the context. If you are explaining a complex decision, you start with the foundation (~을/를 근거로) and then proceed to the action. This order mirrors the logical process: first, you look at the evidence, then you act. In Korean syntax, this provides a clear roadmap for the listener. If you were to place it at the end, it might sound like an afterthought, which weakens the persuasive power of your statement. Therefore, consistently placing the 'basis' at the start of your logical clause is a best practice for clarity.

Common Verb Pairings

근거로 + 판단하다 (to judge), 근거로 + 작성하다 (to write/draft), 근거로 + 반박하다 (to refute).

Finally, consider the particles. While '을/를 근거로' is the most standard form, you might occasionally see '을/를 근거로 하여' which is a slightly longer, more explicit way of saying 'making [Noun] the basis.' This extra '하여' adds a touch of formality and emphasis on the action of using that basis. For most learners at the B1 level, mastering the standard '~을/를 근거로' is the priority, as it is the most frequently encountered and used version in both written and spoken Korean. By practicing with various nouns like '경험' (experience), '이론' (theory), or '통계' (statistics), you can quickly become comfortable justifying your thoughts in Korean.

If you tune into a Korean news broadcast like KBS News or JTBC News, you will hear ~을/를 근거로 almost every few minutes. Journalists use it to attribute their reports to specific sources: '정부 발표를 근거로' (based on the government announcement) or '익명의 제보를 근거로' (based on an anonymous tip). It serves as a linguistic shield for journalists, showing that they are not making things up but are reporting based on information they have received. Similarly, in investigative documentaries, narrators use this phrase to connect various pieces of evidence to a larger narrative, making the story feel more 'grounded' and believable to the audience.

The Courtroom

In legal dramas or real court cases, lawyers and judges use this phrase to link specific laws or evidence to their arguments and verdicts.

The Office

During business meetings, employees use it to justify their proposals, citing market research or previous sales data.

In academic settings, such as university lectures or research seminars, the phrase is indispensable. Professors use it to explain the lineage of a theory or the basis of a critique. When students write papers (논문), they must use '~을/를 근거로' to cite their references and support their arguments. It is the hallmark of academic integrity in the Korean language. Without it, a student's work might be seen as mere opinion rather than a scholarly contribution. This is why B1 and B2 learners who are preparing for the TOPIK (Test of Proficiency in Korean) exam often focus on this phrase for the writing section; it demonstrates a high level of logical organization.

Even in popular culture, such as K-Dramas or variety shows, you will hear this word when characters are trying to solve a mystery or make a point. In a mystery drama like 'Signal' or 'Stranger,' detectives constantly look for '근거' to solve crimes. When they find a clue, they say, '이 단서를 근거로...' (Based on this clue...). In variety shows, if a guest makes a bold claim, the MC might jokingly ask, '무슨 근거로 그런 말씀을 하세요?' (On what basis are you saying that?), emphasizing the need for some sort of proof or reason even in a lighthearted context. This wide range of usage—from the most serious legal proceedings to casual TV banter—shows just how fundamental this phrase is to the Korean way of expressing logic and evidence.

One of the most frequent mistakes learners make is confusing ~을/를 근거로 with the simple causal marker ~때문에 (because of). While both deal with reasons, they are not interchangeable. '~때문에' is used for general cause and effect, often involving personal feelings or uncontrollable circumstances (e.g., 'Because of the rain, I am sad'). In contrast, '~을/를 근거로' is used specifically when something serves as a logical foundation or evidence for a conclusion or action. If you say '비 때문에 나가지 않았어요' (I didn't go out because of the rain), it's a simple cause. If you were to say '비가 온다는 예보를 근거로 계획을 취소했어요' (I canceled the plans based on the forecast that it would rain), you are highlighting the forecast as the logical basis for your decision.

Subjectivity vs. Objectivity

Avoid using '근거로' for purely subjective feelings or moods. It sounds awkward because '근거' implies a level of objective justification.

Another common error involves the particle choice. Some students mistakenly use the locative particle '에' directly with '근거' in a way that mimics English 'on the basis.' They might say '사실에 근거로' which is grammatically incorrect. The correct forms are either '사실을 근거로' (using the object particle) or '사실에 근거하여' (using the verb-based form). Mixing these two up is a classic sign of a learner who is translating directly from English rather than internalizing Korean grammatical structures. Remember: if you use '근거로', you must use the object particle (을/를). If you use '근거하여', you use the '에' particle.

Lastly, learners sometimes use '~을/를 근거로' when they actually mean '~을/를 토대로' (on the foundation of) or '~을/를 바탕으로' (based on). While very similar, '~을/를 근거로' is more focused on 'justification' and 'evidence' (proof), whereas '~을/를 바탕으로' is more focused on 'starting point' or 'material' (creation). For example, if you are writing a novel based on your life, you would use '~을 바탕으로' because your life is the material/foundation. If you are accusing someone of a crime based on a video, you would use '~을 근거로' because the video is the proof. Using '근거로' in a creative context can make the process sound overly clinical or legalistic, which might not be the intended tone.

Nuance Check

Use '근거로' for proof/argument. Use '바탕으로/토대로' for creation/development.

Korean has several ways to say 'based on,' and choosing the right one depends on the nuance you want to convey. The most direct alternative to ~을/를 근거로 is ~에 의거하여. This is a very formal, often legalistic term used in official documents, laws, and regulations. While '근거로' is common in news and professional speech, '의거하여' is what you would see in a contract or a government decree. It carries a sense of strict adherence to a rule or standard. If you use '의거하여' in a casual conversation, you will sound like you are reading a law book, which might be humorous but is generally out of place.

~을/를 근거로 vs. ~에 의거하여

'근거로' is for logical reasoning/evidence in general. '의거하여' is for strict compliance with rules/laws.

Another set of similar expressions includes ~을/를 바탕으로 and ~을/를 토대로. As mentioned earlier, these focus on the 'foundation' or 'raw material' for something new. '바탕' means the background or basic substance, and '토대' refers to the foundation of a building. These are used when you are building something—a career, a story, a project—on a certain foundation. For instance, '경험을 바탕으로 성공했다' (Succeeded based on experience). Here, the experience isn't just 'proof' of success; it's the very stuff the success was built from. If you use '근거로' here, it sounds like you are proving your success with experience, which is slightly different.

Lastly, there is ~에 따라(서), which means 'according to.' This is the most flexible and general of all these terms. It can be used for following instructions, following a trend, or according to some information. '날씨에 따라 계획이 바뀔 수 있어요' (Plans may change according to the weather). While it can sometimes overlap with '근거로,' it lacks the specific 'evidence-based' nuance. '에 따라' focuses more on the 'correlation' or 'compliance,' whereas '근거로' focuses on the 'justification.' Choosing between these depends on whether you want to emphasize the logical proof (근거로) or the simple act of following a source (에 따라).

~을/를 근거로 vs. ~에 따라

'근거로' implies a logical conclusion. '에 따라' implies a change or action following a condition or source.