Lesson 58 · Reasons and Connected Actions: -아/어서
Hyeju’s Beginner Korean · Lesson 58 · Grammar
Reasons and Connected Actions: -아/어서
Learn Reasons and Connected Actions: -아/어서 with form rules, natural examples, common mistakes, romanization, and six practice questions with answers.
Introduction / Review
-아/어서 connects a reason to its result, or closely related actions in a natural sequence. “I’m tired, so I rest” and “I go to a café and drink coffee there” illustrate its two core uses.
N = noun; V = action verb; A = descriptive verb. Romanization is a reading aid.
Today’s Grammar / Explanation
- Use 아/어 + 서: 가다 → 가서; 먹다 → 먹어서; 하다 → 해서. Irregulars: 춥다 → 추워서; 듣다 → 들어서.
- For a reason, the first clause explains the second: 바빠서 못 가요. For linked actions, the first creates the setting for the second: 카페에 가서 커피를 마셔요.
- In basic beginner sentences, put past tense at the end: 아파서 쉬었어요. Noun reasons use (이)라서: 학생이라서, 친구라서.
Examples
피곤해서 집에서 쉬어요.
pigonhaeseo jibeseo swieoyo
I rest at home because I’m tired.
비가 와서 운동을 못 해요.
biga waseo undongeul mot haeyo
I can’t exercise because it is raining.
바빠서 전화를 못 했어요.
bappaseo jeonhwareul mot haesseoyo
I couldn’t call because I was busy.
카페에 가서 커피를 마셔요.
kape-e gaseo keopireul masyeoyo
I go to a café and drink coffee there.
친구를 만나서 같이 밥을 먹었어요.
chingureul mannaseo gachi babeul meogeosseoyo
I met a friend and had a meal with them.
길이 막혀서 늦었어요.
giri makyeoseo neujeosseoyo
I was late because the traffic was heavy.
Compare with similar grammar
LESSON 59
-(으)니까
비가 오니까 우산을 가져가세요.-아/어서 can’t be followed by a command or suggestion. Use -(으)니까 for those.
Look ahead: Lesson 59 →LESSON 17
-고
밥을 먹고 학교에 가요.-고 simply lists actions. -아/어서 links steps that belong together (same place, same object).
Review Lesson 17 →LESSON 61
-기 때문에
눈이 많이 오기 때문에 경기가 취소됐어요.A more formal way to give a reason, with more weight on the cause.
Look ahead: Lesson 61 →LESSON 60
-아/어서 vs -(으)니까
늦어서 죄송합니다.Apologies and thanks use -아/어서: 늦어서 죄송합니다, 도와줘서 고마워요.
Look ahead: Lesson 60 →| Pattern | Use | Example |
|---|---|---|
| -아/어서 (reason) | because (a natural cause) | 배가 고파서 밥을 먹었어요 |
| -아/어서 (sequence) | and then (linked steps) | 친구를 만나서 영화를 봤어요 |
| -(으)니까 | because (+ commands, suggestions) | 추우니까 문을 닫으세요 |
| -고 | and (just listing) | 씻고 자요 |
Common mistakes
Do not teach one rule for both uses. Reason -아/어서 generally does not introduce a following command or suggestion in the basic pattern; use -(으)니까 for that. Sequential -아/어서 can occur with a command: 집에 가서 쉬세요 (“Go home and rest”).
-아/어서 can’t be followed by a command. Use -(으)니까.
No past tense before -아/어서. The last verb shows the time.
You stay seated while reading, so the steps are linked → -아/어서.
ㅣ + 어 contracts to ㅕ: 걸려서.
Mini practice · six questions
All sentences below are new. Try each one before opening the answer.
- Fill in the blank너무 ______ 일찍 잤어요. (피곤하다)
Check answer
너무 피곤해서 일찍 잤어요.
하다 → 해서. “I was so tired that I went to bed early.”
- Fill in the blank시장에 ______ 과일을 샀어요. (가다)
Check answer
시장에 가서 과일을 샀어요.
You went to the market and bought fruit there → 가서.
- Choose the correct form시간이 (없어서 / 없으니까) 택시를 탑시다.
Check answer
없으니까
A suggestion (탑시다) follows, so use -(으)니까.
- Choose the correct form어제 (아팠어서 / 아파서) 학교에 못 갔어요.
Check answer
아파서
No past tense before -아/어서.
- Find and fix the mistake친구를 만나고 그 친구하고 같이 영화를 봤어요.
Check answer
친구를 만나서 그 친구하고 같이 영화를 봤어요.
Meeting the friend leads straight into watching with them → -아/어서.
- Say it in KoreanThanks for coming.
Check answer
와 줘서 고마워요.
Thanks use -아/어서: 와 주다 → 와 줘서.
Today’s Key Point
아/어서 can mean reason-result or connected sequence; distinguish those uses; 하다 → 해서.
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