Korean Conjunctions: How to Connect Your Sentences Like a Native

Meta Description: Master Korean conjunctions and sentence connectors — from basic 그리고 and 하지만 to advanced grammar patterns like -(으)면서 and -는데. Your complete guide to linking ideas naturally in Korean.

Introduction: The Secret to Sounding Natural in Korean

You've learned the vocabulary. You can form basic sentences. You know how to introduce yourself, order food, and ask for directions. But when you try to speak in longer, more connected thoughts — you freeze. Every sentence comes out short, choppy, and disconnected. You sound like a phrasebook rather than a person.

The missing ingredient is almost always conjunctions and sentence connectors — the grammatical glue that binds ideas together into fluid, natural-sounding speech.

In English, we rely heavily on standalone conjunctions: "and," "but," "because," "so," "although." Korean works somewhat differently. While Korean does have standalone conjunctions, much of the connecting work is done through verb and adjective endings — suffixes attached directly to the first clause that signal the relationship to the second. Mastering this system is one of the most transformative steps any Korean learner can take.

This guide covers everything you need to know about Korean conjunctions — from the beginner essentials to the intermediate and advanced patterns that will take your Korean from textbook to truly native-sounding.

Part 1: Standalone Korean Conjunctions (접속사)

These are the simplest conjunctions — single words placed between two sentences or clauses, much like their English equivalents. They're the best starting point for beginners.

1. 그리고 — "And" / "And then"

그리고 is used to connect two sentences or add information sequentially.

Usage: Placed at the beginning of the second sentence, or between two clauses.

Examples:

저는 커피를 마셨어요. 그리고 책을 읽었어요. I drank coffee. And then I read a book.
그녀는 예뻐요. 그리고 똑똑해요. She is pretty. And she is smart.

Native speaker tip: 그리고 is perfectly natural in speech and writing, but native speakers often prefer the verb-ending connector -고 for smoother flow in a single sentence (covered in Part 2).

2. 하지만 / 그런데 / 그러나 — "But" / "However"

These three conjunctions all express contrast or contradiction, but they carry slightly different nuances:

하지만 — straightforward "but," common in both speech and writing
그런데 — softer contrast, often used conversationally; can also mean "by the way" when shifting topics
그러나 — more formal, common in written language and news reporting

Examples:

비가 왔어요. 하지만 우산이 없었어요. It rained. But I didn't have an umbrella.
그 영화는 길었어요. 그런데 재미있었어요. The movie was long. But (still) it was interesting.
경제가 성장했다. 그러나 빈부 격차는 줄지 않았다. The economy grew. However, the wealth gap did not narrow. (formal/written)

Native speaker tip: In everyday conversation, 그런데 (often shortened to 근데) is used far more than 하지만. Overusing 하지만 in casual speech can sound slightly stiff.

3. 그래서 — "So" / "Therefore"

그래서 connects a cause to its result — the first sentence explains why, and the second gives the outcome.

Examples:

배가 고팠어요. 그래서 밥을 먹었어요. I was hungry. So I ate.
늦잠을 잤어요. 그래서 학교에 지각했어요. I overslept. So I was late to school.

4. 그러면 / 그럼 — "Then" / "In that case"

Used to indicate a conditional consequence — "if that is so, then..."

Examples:

그러면 내일 만날까요? Then shall we meet tomorrow?
그럼 저는 먼저 갈게요. Then I'll go ahead first.

Native speaker tip: 그럼 is the casual shortening of 그러면 and is extremely common in everyday speech.

5. 또는 / 아니면 — "Or"

Both mean "or," but they're used in slightly different contexts:

또는 is more formal and common in written language
아니면 is conversational and very common in everyday speech

Examples:

차 또는 커피를 드시겠어요? Would you like tea or coffee? (formal/written)
지금 갈 거야, 아니면 나중에? Are you going now, or later? (casual speech)

6. 왜냐하면 — "Because" (formal explanation)

왜냐하면 introduces an explanation for a previously stated fact. It usually pairs with -기 때문이다 or -(으)니까 at the end of the explanatory clause.

Examples:

저는 고기를 안 먹어요. 왜냐하면 채식주의자이기 때문이에요. I don't eat meat. Because I am a vegetarian.

Native speaker tip: 왜냐하면 is somewhat formal. In casual speech, Koreans more often use (-)니까 or -어서 endings (covered below) rather than a standalone 왜냐하면.

Part 2: Verb-Ending Connectors (연결어미) — The Heart of Korean Conjunction

This is where Korean truly differs from European languages — and where the real power of Korean sentence connection lives. Rather than inserting a separate conjunction word between two sentences, Korean attaches a connecting suffix (연결어미, yeongyeol-eomi) directly to the end of the first verb or adjective. The suffix itself encodes the logical relationship between the clauses.

Mastering these patterns is the single most important step toward natural Korean.

1. -고 — "And" (Sequential or additive)

-고 is the most basic connector. It attaches to a verb or adjective stem and links two actions or states.

Formation: Verb/Adjective stem + 고

Examples:

아침을 먹고 학교에 갔어요. I ate breakfast and went to school.
그녀는 키가 크고 머리가 길어요. She is tall and has long hair.
저는 한국어를 공부하고 친구는 일본어를 공부해요. I study Korean and my friend studies Japanese.

Key point: -고 is tense-neutral — the tense of the whole sentence is determined by the final verb, not by the -고 clause. Don't conjugate the first verb for tense when using -고.

❌ 먹었고 갔어요. (Incorrect for sequential actions) ✅ 먹고 갔어요. (Correct)

2. -아서/어서 — "And so" / "Because" / "After doing"

One of the most versatile and frequently used connectors. -아서/어서 can express:

Sequential action (do A, then B — especially when A is the precondition for B)
Cause and result (because of A, B happens)

Formation:

Verb stems ending in 아 or 오 vowel → -아서
All other verb stems → -어서
하다 verbs → 해서

Examples:

버스를 타서 학교에 갔어요. I took the bus and (then) went to school.
피곤해서 일찍 잤어요. I was tired, so I went to sleep early. (cause → result)
시장에 가서 야채를 샀어요. I went to the market and bought vegetables. (sequential)

Important rule: Like -고, the -아서/어서 clause cannot be conjugated for past tense — tense is marked only on the final verb.

❌ 피곤했어서 잤어요. (Unnatural) ✅ 피곤해서 잤어요. (Correct)

3. -(으)니까 — "Because" / "Since" (Stronger causality)

-(으)니까 also expresses cause and reason, but it has a stronger, more assertive tone than -아서/어서. It's particularly used when the speaker is giving a reason that justifies a command, suggestion, or request.

Formation:

Verb/adjective stems ending in a consonant → -으니까
Stems ending in a vowel → -니까

Examples:

날씨가 추우니까 코트를 입으세요. Since it's cold, please wear a coat. (reason for command)
제가 한국 사람이니까 한국어를 잘 해요. Since I'm Korean, I speak Korean well.
늦었으니까 빨리 가자. Since we're late, let's hurry.

Key distinction from -아서/어서:

-아서/어서 → neutral cause-effect; cannot be followed by commands or suggestions
-(으)니까 → justifying cause; can be followed by commands (세요), suggestions (자), requests

❌ 바쁘어서 나중에 전화해 주세요. (Incorrect) ✅ 바쁘니까 나중에 전화해 주세요. (Correct — "Since I'm busy, please call later.")

4. -(으)면 — "If" / "When"

The standard conditional connector. Expresses a hypothetical or anticipated condition.

Formation:

Stems ending in a consonant → -으면
Stems ending in a vowel → -면

Examples:

비가 오면 집에 있을 거예요. If it rains, I'll stay home.
열심히 공부하면 시험에 합격할 수 있어요. If you study hard, you can pass the exam.
서울에 가면 꼭 경복궁을 방문하세요. When you go to Seoul, be sure to visit Gyeongbokgung.

5. -지만 — "But" / "Although"

The verb-ending equivalent of 하지만 — attaches directly to the first clause to express contrast.

Formation: Verb/adjective stem + 지만

Examples:

비가 오지만 나가고 싶어요. Although it's raining, I want to go out.
비싸지만 정말 맛있어요. It's expensive, but it's really delicious.
한국어는 어렵지만 재미있어요. Korean is difficult, but it's interesting.

Native speaker tip: -지만 is extremely common in natural speech. Using it instead of 하지만 almost always sounds more fluid.

6. -(으)면서 — "While" / "At the same time"

Expresses two actions happening simultaneously, performed by the same subject.

Formation:

Stems ending in a consonant → -으면서
Stems ending in a vowel → -면서

Examples:

음악을 들으면서 공부해요. I study while listening to music.
걸으면서 전화했어요. I talked on the phone while walking.
웃으면서 이야기했어요. She talked while smiling.

Important: Both clauses must share the same subject. You cannot use -면서 when two different people are doing different things simultaneously.

7. -는데 / -(으)ㄴ데 — The Versatile Background Connector

-는데 (for action verbs) and -(으)ㄴ데 (for descriptive verbs/adjectives) is one of the most frequently used and nuanced connectors in Korean. It can express:

Background / context setting: "The situation is X, and (in that context)..."
Contrast: similar to "but"
Polite hesitation / trailing off

Formation:

Action verb present stem + -는데
Descriptive verb/adjective stem + -(으)ㄴ데
Past tense + -았/었는데

Examples:

지금 바쁜데 나중에 얘기할 수 있어요? I'm busy right now, but (so) can we talk later?
이 식당은 맛있는데 좀 비싸요. This restaurant is good, but a bit expensive.
어제 친구를 만났는데 너무 반가웠어요. I met a friend yesterday, and I was so happy to see them.

Native speaker tip: -는데 is extraordinarily common in spoken Korean — arguably the single most frequently heard connector. Learning to use it naturally is a major milestone in sounding like a native speaker.

8. -거나 — "Or" (between verbs/actions)

The verb-ending form of "or," used to present alternative actions.

Examples:

주말에는 책을 읽거나 영화를 봐요. On weekends, I read books or watch movies.
배가 고프면 밥을 먹거나 빵을 드세요. If you're hungry, eat rice or have some bread.

Part 3: Advanced Connectors for Natural, Nuanced Korean

1. -(으)려고 — "In order to" / "Intending to"

Expresses purpose or intention.

Examples:

한국어를 배우려고 학원에 다녀요. I attend a language academy in order to learn Korean.
살을 빼려고 매일 운동해요. I exercise every day in order to lose weight.

2. -아도/어도 — "Even if" / "Even though"

Expresses concession — the result holds true regardless of the condition.

Examples:

비가 와도 갈 거예요. Even if it rains, I'll go.
아무리 피곤해도 운동은 해야 해요. No matter how tired you are, you need to exercise.

3. -다가 — "While doing A, then B" (interrupted action)

Used when an action is in progress and then something else happens — often implying interruption or transition.

Examples:

공부하다가 잠들었어요. I fell asleep while studying.
길을 걷다가 친구를 만났어요. I ran into a friend while walking down the street.

4. -(으)ㄹ수록 — "The more... the more..."

Examples:

한국어는 공부할수록 재미있어요. The more you study Korean, the more interesting it becomes.
생각할수록 이상해요. The more I think about it, the stranger it seems.

Part 4: Quick Reference — Conjunction Cheat Sheet

Connector	Meaning	Example
그리고	And (standalone)	먹었어요. 그리고 잤어요.
-고	And (verb ending)	먹고 잤어요.
하지만 / 그런데	But	비가 오지만 / 그런데 괜찮아요.
-지만	But (verb ending)	비싸지만 맛있어요.
그래서	So / Therefore	배고파서 먹었어요.
-아서/어서	Because / After	피곤해서 잤어요.
-(으)니까	Because (strong)	바쁘니까 나중에 와요.
-(으)면	If / When	가면 연락해요.
-(으)면서	While (same subject)	먹으면서 봐요.
-는데	Background / But	바쁜데 잠깐요?
-거나	Or (between verbs)	읽거나 봐요.
-아도/어도	Even if	와도 괜찮아요.
-다가	While (interrupted)	보다가 잠들었어요.
-(으)려고	In order to	배우려고 왔어요.

Part 5: Common Mistakes Learners Make

Mistake 1: Using tense markers inside -고 and -아서/어서 clauses

❌ 밥을 먹었고 나갔어요. ✅ 밥을 먹고 나갔어요. The tense of the full sentence is carried by the final verb only.

Mistake 2: Using -아서/어서 before commands

❌ 피곤해서 좀 쉬세요. ✅ 피곤하니까 좀 쉬세요. Only -(으)니까 can precede commands, requests, and suggestions.

Mistake 3: Using -(으)면서 with different subjects

❌ 제가 공부하면서 친구가 놀았어요. ✅ 저는 공부하고 친구는 놀았어요. Both verbs in a -면서 sentence must share the same subject.

Mistake 4: Overusing 그리고 where -고 sounds more natural

❌ 저는 밥을 먹었어요. 그리고 물을 마셨어요. ✅ 저는 밥을 먹고 물을 마셨어요. In a single connected thought, verb-ending connectors sound far more fluid.

Conclusion: Connect Your Thoughts, Connect With Koreans

Conjunctions and connectors are the architecture of fluent language. In Korean, this architecture is built largely not with separate words but with elegant suffixes that flow directly from one verb to the next — creating the smooth, continuous cadence of natural Korean speech.

The journey from short, choppy sentences to connected, expressive Korean is one of the most satisfying progressions in language learning. Start with the fundamentals — -고, -아서/어서, -지만, -(으)면 — and use them until they feel automatic. Then layer in the more nuanced connectors like -는데, -다가, and -(으)면서 as your confidence grows.

Every conversation is a chance to practice. Don't wait until your Korean is perfect to connect your sentences — connect them now, make mistakes, get corrected, and improve. That is exactly how native speakers learned, too.

화이팅! (Keep going!)

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