A1 suffix #500 am häufigsten 2 Min. Lesezeit

아서/어서

It connects two actions or states, showing that the first one is the cause of the second.

Practice it

Explanation at your level:

You use 아서/어서 to say 'because'. If you are hungry, you say '배가 고파서 먹어요'. It is very easy to use once you know the vowel rule!

Use this to connect two simple sentences. For example, 'The weather is cold, so I wear a coat.' It helps you tell a story about your day clearly.

At this level, you start using it to explain reasons for decisions. It is perfect for professional settings where you need to justify your actions or requests politely.

You will notice that native speakers use this to create flow. It links emotional states to actions, providing nuance that simple 'because' (때문에) cannot always convey.

In advanced writing, this suffix helps maintain logical cohesion. It allows for sophisticated sentence structures where the cause is embedded naturally within the narrative flow of a paragraph.

Mastery involves understanding the subtle difference between this and '-니까'. While '-니까' is subjective and imperative, '-아서/어서' focuses on the objective causal link, essential for literary precision.

Wort in 30 Sekunden

  • Connects reason and result.
  • Follows vowel harmony.
  • Not for commands.
  • Essential for daily speech.

Think of 아서/어서 as the glue that holds your reasons together. When you want to explain why something happened, you simply attach this suffix to your verb or adjective.

If the verb stem ends in vowels 'ㅏ' or 'ㅗ', you use 아서. For all other vowels, you use 어서. It is the most natural way to express causality in Korean.

The suffix has deep roots in Middle Korean. It evolved from the combination of the locative particle and verbal endings that indicated a sequence of events.

Over centuries, it streamlined into the current form used to show logical progression. It is a classic example of how Korean grammar evolved to prioritize logical connectivity within sentences.

You use this in almost every conversation. It is perfect for explaining feelings, such as 'I am happy because I saw you.'

It is generally neutral in register, making it suitable for both casual chats with friends and respectful conversations with colleagues. Remember, it cannot be used with past tense markers like '-았/었-' directly before it.

While not an idiom itself, it appears in common phrases like '배가 고파서 밥을 먹다' (I ate because I was hungry). Another is '바빠서 못 가요' (I can't go because I'm busy).

These patterns are the building blocks of Korean fluency. Mastering them allows you to construct complex thoughts effortlessly.

The pronunciation follows the vowel harmony rule. When speaking, ensure the transition between the stem and the suffix is smooth, almost like a single syllable.

There is no plural form as it is a grammatical particle. It is strictly used for connecting clauses, not for nouns. Stress usually falls on the preceding verb stem.

Fun Fact

It is one of the most frequently used grammatical markers in the Korean language.

Pronunciation Guide

UK /a.sʌ/ or /ʌ.sʌ/

Short, crisp vowels.

US /a.sə/ or /ʌ.sə/

Relaxed, natural flow.

Common Errors

  • Over-emphasizing the suffix
  • Ignoring vowel harmony
  • Pausing too long before it

Rhymes With

가서 와서 타서 사서 마셔서

Difficulty Rating

Lesen 1/5

Very easy to read.

Writing 2/5

Requires vowel knowledge.

Speaking 2/5

Natural flow needed.

Hören 1/5

Very common.

What to Learn Next

Prerequisites

Verb stems Vowels

Learn Next

-(으)니까 때문에

Fortgeschritten

-느라고 -(으)므로

Grammar to Know

Vowel Harmony

가+아서 -> 가서

Causal Connectives

아서 vs 니까

Sentence Linking

Connecting clauses

Examples by Level

1

배가 고파서 먹어요.

Stomach hungry because eat.

Simple cause-effect.

2

아파서 학교에 안 가요.

Sick because school not go.

Reason for absence.

3

비가 와서 집에 있어요.

Rain comes because home stay.

Weather reason.

4

좋아서 샀어요.

Like because bought.

Reason for purchase.

5

바빠서 못 만나요.

Busy because cannot meet.

Scheduling conflict.

6

더워서 물을 마셔요.

Hot because water drink.

Physical state.

7

피곤해서 자요.

Tired because sleep.

Reason for sleep.

8

재미있어서 봐요.

Fun because watch.

Reason for interest.

1

날씨가 좋아서 산책해요.

2

돈이 없어서 못 사요.

3

기분이 좋아서 웃어요.

4

시간이 없어서 못 해요.

5

영화를 봐서 행복해요.

6

공부를 해서 똑똑해요.

7

선물을 받아서 기뻐요.

8

연락을 해서 알아요.

1

회사가 멀어서 지하철을 타요.

2

약속이 있어서 먼저 갈게요.

3

준비를 해서 시험을 잘 봤어요.

4

고장이 나서 수리해야 해요.

5

너무 놀라서 아무 말도 못 했어요.

6

열심히 해서 성공했어요.

7

실수를 해서 사과했어요.

8

어제 늦게 자서 피곤해요.

1

그 소식을 들어서 정말 다행이에요.

2

상황이 복잡해서 결정하기 어려워요.

3

노력을 해서 결과를 얻었어요.

4

오해를 해서 미안해요.

5

준비가 부족해서 걱정이에요.

6

마음이 변해서 안 갈래요.

7

가족이 보고 싶어서 전화했어요.

8

길을 잃어서 지도를 봤어요.

1

그 제안을 수락해서 다행이라고 생각합니다.

2

예산이 부족해서 계획을 수정해야 합니다.

3

경험이 많아서 문제를 잘 해결했어요.

4

진심을 다해서 말했기 때문에 이해할 거예요.

5

날씨가 급변해서 일정을 취소했습니다.

6

기대를 해서 실망도 큰 법입니다.

7

오랜만에 만나서 반가웠습니다.

8

원인을 파악해서 대책을 세웠습니다.

1

본질을 파악해서 핵심을 찌르는 답변이었습니다.

2

역경을 딛고 일어나서 성공을 거머쥐었습니다.

3

학문의 길을 걸어서 진리를 깨달았습니다.

4

상호 간의 협의를 거쳐서 합의에 도달했습니다.

5

예술적 감각을 발휘해서 걸작을 탄생시켰습니다.

6

시대의 흐름을 읽어서 변화를 주도했습니다.

7

철저히 분석해서 오류를 찾아냈습니다.

8

관습에 얽매이지 않아서 새로운 시도를 했습니다.

Häufige Kollokationen

배가 고파서
바빠서
아파서
좋아서
재미있어서
피곤해서
몰라서
더워서
추워서
기뻐서

Idioms & Expressions

"좋아서 어쩔 줄 모르다"

To be so happy one doesn't know what to do.

선물을 받고 좋아서 어쩔 줄 몰라 했다.

neutral

"바빠서 눈코 뜰 새 없다"

To be extremely busy.

요즘 바빠서 눈코 뜰 새가 없어.

casual

"아파서 죽겠다"

To be very sick (exaggeration).

머리가 아파서 죽겠어.

casual

"배가 고파서 쓰러지겠다"

To be starving.

배가 고파서 쓰러지겠어.

casual

"놀라서 가슴이 내려앉다"

To be shocked.

너무 놀라서 가슴이 내려앉았어.

neutral

"더워서 숨이 막히다"

To be suffocatingly hot.

날씨가 더워서 숨이 막혀.

neutral

Easily Confused

아서/어서 vs -(으)니까

Both mean 'because'.

니까 is for subjective reasons/commands.

비가 오니까 우산 써.

아서/어서 vs 때문에

Both mean 'because'.

때문에 is for nouns.

비 때문에 못 가.

아서/어서 vs 길래

Both show reason.

길래 implies observation.

맛있길래 먹었어.

아서/어서 vs 통에

Shows cause.

통에 is for negative events.

시끄러운 통에 깼어.

Sentence Patterns

A1

[Verb/Adj] + 아서/어서 + [Result]

배가 고파서 먹어요.

A2

[Verb/Adj] + 아서/어서 + [Verb/Adj]

날씨가 좋아서 산책해요.

A2

[Verb/Adj] + 아서/어서 + [Action]

아파서 병원에 갔어요.

B1

[Verb/Adj] + 아서/어서 + [Feeling]

선물을 받아서 기뻐요.

B2

[Verb/Adj] + 아서/어서 + [Conclusion]

열심히 해서 성공했어요.

Wortfamilie

Verwandt

-(으)니까 Similar causal function

How to Use It

frequency

10

Formality Scale

Neutral Polite Casual

Häufige Fehler

Adding past tense before it → 먹어서
You cannot say 먹었어서.
Using with nouns → 때문에
Only use with verbs/adjectives.
Confusing with -니까 → 아서/어서
Don't use for imperatives.
Using with future tense → 가서
Don't use -겠- before it.
Missing vowel harmony → 와서/가서
Must match the stem vowel.

Tips

💡

Vowel Check

Check the last vowel before adding.

💡

Natural Flow

Connect your thoughts naturally.

🌍

Politeness

Always use with polite endings.

💡

No Past Tense

Keep the suffix base form.

💡

Smooth Transition

Don't pause.

💡

Noun Trap

Don't use with nouns.

💡

Versatility

It's used in almost every sentence.

💡

Daily Practice

Describe your day.

💡

Contrast with 니까

Remember 니까 for commands.

💡

Vowel Harmony

Listen to native speakers.

Memorize It

Mnemonic

Think of 'Ah!' (as in realization) for '아서'.

Visual Association

A bridge connecting two islands (Reason and Result).

Word Web

Reason Result Cause Effect

Herausforderung

Write 5 sentences about your day using this.

Wortherkunft

Korean

Original meaning: Sequence and cause

Kultureller Kontext

None, universally used.

Directly maps to 'because' or 'so'.

Used in almost every K-drama dialogue.

Practice in Real Life

Real-World Contexts

Daily life

  • 배가 고파서
  • 피곤해서
  • 바빠서

At work

  • 회의가 있어서
  • 일이 많아서
  • 도와주셔서

Travel

  • 길을 몰라서
  • 비가 와서
  • 시간이 없어서

School

  • 공부를 해서
  • 시험이 있어서
  • 숙제가 많아서

Conversation Starters

"왜 한국어를 공부해요?"

"오늘 왜 기분이 좋아요?"

"왜 어제 일찍 잤어요?"

"왜 그 영화를 좋아해요?"

"왜 식당에 사람이 많아요?"

Journal Prompts

Write about why you started learning Korean.

Describe your favorite meal and why you like it.

Explain why you are tired today.

List three things you did today because of the weather.

Häufig gestellte Fragen

8 Fragen

No, use 때문에 for nouns.

It is neutral and used everywhere.

Use 아서.

Use 어서.

No, only in the result clause.

Yes, 니까 is for commands/suggestions.

Look at the last vowel of the stem.

It is one of the first grammar points learned.

Teste dich selbst

fill blank A1

배가 (고프) ___ 밥을 먹어요.

Richtig! Nicht ganz. Richtige Antwort: 어서

고프 uses 어서.

multiple choice A2

Which is correct?

Richtig! Nicht ganz. Richtige Antwort: 먹어서

No past tense before 아서/어서.

true false B1

Can I use 아서/어서 with a command?

Richtig! Nicht ganz. Richtige Antwort: Falsch

Use 니까 for commands.

match pairs B1

Word

Bedeutung

All matched!

Matching stems to meaning.

sentence order B2

Tippe auf die Wörter unten, um den Satz zu bilden
Richtig! Nicht ganz. Richtige Antwort:

Reason first, result second.

Ergebnis: /5

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