-기 때문에
Because
-기 때문에 is a grammar pattern that means "because" or "due to." It is used to state a clear and direct reason for a following action or state.
How It Works
-기 때문에 is a versatile way to express a reason, often carrying a more objective and logical tone than other similar patterns. It explicitly states the cause for the result that follows.
Construction:
- Verb/Adjective Stem + -기 때문에
- 먹다 (to eat) → 먹기 때문에 (because I eat)
- 예쁘다 (to be pretty) → 예쁘기 때문에 (because she is pretty) - Noun + 이기 때문에
- 학생 (student) → 학생이기 때문에 (because I am a student)
Tense:
To express a reason that occurred in the past, the past tense infix -았/었- is added before -기 때문에.
- Verb/Adjective Stem + -았/었기 때문에
- 공부했다 (studied) → 공부했기 때문에 (because I studied)
- 바빴다 (was busy) → 바빴기 때문에 (because I was busy)
Nuances and Comparisons:
While -기 때문에, -아/어서, and -으니까 all mean "because," they have different nuances:
- -기 때문에: States a clear, logical reason. It's common in formal speech, writing, and when you want to emphasize the cause-and-effect relationship. It can be used with various sentence endings, but it's less common with direct commands or proposals in casual speech.
- -아/어서: Expresses a natural, sequential cause and effect. It's very common in daily conversation but cannot be used with commands (e.g., -세요) or proposals (e.g., -ㅂ시다).
- -으니까: Often used when the reason is a subjective judgment or a discovery. It is the most common pattern to use before a command or proposal.
For example, "Because it's raining, let's take a taxi." would most naturally use -으니까 (비가 오니까 택시를 탑시다).
Examples (5)
- 날씨가 춥기 때문에 두꺼운 옷을 입었어요.
Because the weather is cold, I wore thick clothes.
Word by Word: Weather is cold because thick clothes I wore.
- 어제 시험공부를 열심히 했기 때문에 오늘 시험을 잘 봤어요.
Because I studied hard for the exam yesterday, I did well on it today.
Word by Word: Yesterday exam study hard did because today exam well took.
- 그는 외국인이기 때문에 한국 문화에 익숙하지 않아요.
Because he is a foreigner, he is not familiar with Korean culture.
Word by Word: He foreigner is because Korean culture to familiar is not.
- 공사 중이기 때문에 이 길로 갈 수 없습니다.
Because it is under construction, you cannot go this way.
This is a common usage for official announcements or signs, where a clear, objective reason is needed.
- 회의 자료를 준비해야 하기 때문에 먼저 퇴근하겠습니다.
Because I have to prepare materials for the meeting, I will leave work first.
This example shows a formal and polite way to state a reason in a professional setting.
Common Mistakes
Using -기 때문에 for commands or proposals in casual conversation.
Not Quite비가 오기 때문에 우리 영화 보러 가자.Better비가 오니까 우리 영화 보러 가자.While grammatically possible in some contexts, -기 때문에 sounds unnatural and overly formal when making a casual suggestion. -으니까 is the standard choice for giving a reason before a command or proposal like '-자' (let's).
Using -기 때문에 for simple, natural cause-and-effect in casual speech.
Different Meaning피곤하기 때문에 일찍 잘 거예요.Better피곤해서 일찍 잘 거예요.For a simple and direct reason like being tired, -아/어서 sounds more natural and fluid in everyday conversation. Using -기 때문에 can make the reason sound more deliberate or emphasized than necessary.
Learn This First
To express strong causation 'because', you need nominalization and conjugation.
Related Patterns
- -아/어서Because of, Therefore
Both mean 'because', but -아/어서 implies a more natural, sequential relationship and cannot be used with commands or proposals. -기 때문에 is more explicit and formal.
- -(으)니까So, Because
Both mean 'because', but -으니까 is often used for subjective reasons or discoveries and is the preferred form before commands or suggestions. -기 때문에 is more objective.
- -는 바람에Because of, Due to
This also expresses a reason, but specifically for an unexpected and usually negative outcome. -기 때문에 is neutral and can be used for both positive and negative results.
- -로 인하다Due to, Because of
This means 'due to' and is even more formal and literary than -기 때문에. It is primarily used in news reports, academic papers, and official documents.