Hangul 111: Connecting Two Ideas — -고, -지만, -아서/어서

Part of the Learn Korean series on Gentle Path Living

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Before We Start

You’ve now covered the three core tenses — present, past, and future. But so far, every example sentence has been short and standalone: “I ate.” “I went.” “I’ll call.” Real conversation rarely works that way. We connect ideas: “I ate and then went to school.” “It’s expensive, but I like it.” “I was tired, so I rested.”

In Korean, you don’t usually connect these ideas the way English does — with a separate word like “and,” “but,” or “so” sitting between two full sentences. Instead, Korean attaches a small ending directly onto the first verb, fusing the two ideas into one flowing sentence. This is one of the clearest signs of natural, fluent-sounding Korean — and it’s exactly what today’s lesson is about.

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The Three Core Connectors

Connector	Meaning	Function
-고	“and” / “and then”	Lists actions or facts, often in sequence
-지만	“but”	Introduces contrast
-아서/어서	“so” / “because”	Gives a reason or cause

Each one attaches to the verb stem of the first clause, replacing the need for a standalone conjunction word.

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-고: And / And Then

Rule	Example
Verb stem + 고	먹다 (eat) → 먹고

Korean	English
아침을 먹고 학교에 갔어요.	I ate breakfast and went to school.
숙제를 하고 텔레비전을 봤어요.	I did homework and watched TV.
한국어를 공부하고 일본어도 배워요.	I study Korean and also learn Japanese.

Note that -고 doesn’t always mean strict sequence — sometimes it’s just listing two related facts, as in the third example.

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-지만: But

Rule	Example
Verb/adjective stem + 지만	비싸다 (be expensive) → 비싸지만

Korean	English
이 옷은 비싸지만 예뻐요.	These clothes are expensive, but pretty.
시간이 없지만 커피를 마셔요.	I don’t have time, but I still drink coffee.
피곤하지만 운동할 거예요.	I’m tired, but I’m going to exercise.

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-아서/어서: So / Because

This connector follows the same vowel rule you learned in the past tense lesson — ㅏ/ㅗ stems take -아서, everything else takes -어서.

Stem vowel	Ending	Example
ㅏ, ㅗ	-아서	가다 (go) → 가서
Everything else	-어서	먹다 (eat) → 먹어서

Korean	English
비가 와서 집에 있었어요.	It rained, so I stayed home.
배가 고파서 빵을 샀어요.	I was hungry, so I bought bread.
친구를 만나서 영화를 봤어요.	I met a friend, so we watched a movie.

Important: -아서/어서 can’t be used before a command or suggestion. You can’t say “피곤해서 쉬세요” for “You’re tired, so please rest” — Korean requires -(으)니까 in that situation instead (“피곤하니까 쉬세요”). This is a common mistake, so it’s worth remembering as an exception.

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A Short Dialogue

하나: 오늘 뭐 했어요? (What did you do today?)

동현: 아침에 운동하고 회사에 갔어요. 일이 많았지만 재미있었어요. (I exercised in the morning and went to work. There was a lot of work, but it was fun.)

하나: 잘했네요! 저는 몸이 안 좋아서 집에 있었어요. (Well done! I wasn’t feeling well, so I stayed home.)

동현: 괜찮아요? 푹 쉬세요. (Are you okay? Get some rest.)

Notice how 동현’s sentence uses both -고 and -지만 in one flowing thought, and 하나 uses -아서 to explain why she stayed home — this is exactly how these connectors work together in real conversation.

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For Heritage Learners

If you grew up hearing sentences like “배고파서 밥 먹었어” or “피곤한데 그냥 잤어” at home, you’ve absorbed these connector patterns by ear long before seeing them written out. This lesson is really about putting a name and a rule to something you likely already do instinctively in speech. Try recalling a sentence you’ve heard a parent or grandparent say that used “그래서” or “-는데” — chances are, a version of it used one of today’s connectors instead.

For Beginners

The easiest mistake to make early on is translating “and,” “but,” and “so” directly as standalone Korean words (그리고, 하지만, 그래서) at the start of every new sentence. That’s not wrong, but it can sound choppy — like a string of short sentences instead of one natural thought. As you get comfortable, try folding two short sentences into one using -고, -지만, or -아서/어서 instead.

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Practice

Try connecting these sentence pairs using the connector in parentheses:

1. 저는 집에 가요. 밥을 먹어요. (-고)
2. 날씨가 추워요. 코트를 안 입었어요. (-지만)
3. 늦게 잤어요. 피곤해요. (-아서/어서)
4. 한국어를 공부해요. 재미있어요. (-고)
5. 시험이 어려웠어요. 열심히 공부했어요. (-지만)

Try writing one sentence about your day using at least one of today’s connectors.

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What’s Next

Now that you can connect ideas smoothly, [Hangul 112] will look at how to ask questions naturally — moving beyond simple yes/no questions into softer, more conversational ways of asking.

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