You can now make sentences. The next skill is making two of them feel like one thought. Korean offers two quite different tools here — and English speakers commonly pick the wrong one for the wrong place. The split is clean: connective adverbs (and/but/so) sit between complete sentences, while clause endings glue the first verb directly to the second clause. Both are everyday; both are easy once you see which is which.
System one: sentence-level connectors#
These words attach to the end of a sentence and start the next one — like ", and then" / ". However," in English.
| Connector | Meaning |
|---|---|
| 그리고 | and (too) |
| 그래서 | so / therefore |
| 하지만 | but / however |
| 그런데 | but / however / then again |
| 그리고 나서 | and then |
방이 작아요. 그리고 조용해요. (The room is small. And it's quiet.) 많이 걸었어요. 그래서 피곤해요. (I walked a lot. So I'm tired.) 비싸요. 하지만 맛있어요. (It's expensive. But it's delicious.)
Notice each piece is a full sentence with its own verb. They simply sit side by side with the connector word bridging them — minimal grammar, maximal clarity. This is the "safe" system for making sure your meaning lands.
System two: clause endings on the first verb#
The more natural (and more Korean) path draws the two thoughts into one sentence by transforming the first verb. Take the stem, add the connector ending, then finish with the main verb.
| Final | Meaning | Example |
|---|---|---|
| -고 | and / and then | 가고 싶어요 (want to go + want) |
| -지만 | but | 크지만 (big, but…) |
| -서 | and so / because | 피곤해서 (tired, so…) |
Concrete examples:
이 책이 재미있어서 자주 읽어요. (This book is interesting, so I read it often.) 어제 늦게 잤지만 일찍 일어났어요. (I slept late last night but woke early.) 물을 많이 마시고 자요. (Drink lots of water, then sleep.)
The ending attaches straight onto the stem — no spacing, no politeness marker mid-sentence. Only the final verb carries the full ending (and its politeness from Part 3).
Picking a connector without panic#
| What you mean | Sentence connector | Clause ending |
|---|---|---|
| and | 그리고 | -고 |
| but | 하지만 / 그런데 | -지만 |
| so / because | 그래서 | -서 (action), 기 때문에 (reason) |
The mental default many learners adopt: for spoken safety, use the sentence connectors (그리고/하지만/그래서); for natural rhythm, use the clause endings. Both are correct; the clause endings just sound more like a native.
왜냐하면 + 기 때문에: giving a real reason#
For an explicit "because," pair these:
왜냐하면 (because) + sentence, or verb stem + -기 때문에 (because of)
왜 늦었어요? 왜냐하면 버스가 늦었어요. (Why were you late? Because the bus was late.) 버스가 늦기 때문에 늦었어요. (I was late because the bus was late.)
Because the reason word can come either way, this is the cleanest "why" you will ask and answer.
The politeness agreement problem#
The subtle thing: the first clause's politeness moves onto its ending. In "피곤해서 집에 가요," the -서 carries the formal weight; adding 요 to the stem would be wrong (피곤해서요? is only used as a trailing afterthought). As a beginner rule, keep connectors attached to the stem, and keep 요 on the final verb:
| Natural | Not natural |
|---|---|
| 피곤해서 가요 | 피곤해서요 가요 |
| 비싸지만 사요 | 비싸지만요 사요 |
Practice: upgrade single sentences to pairs#
- 친구를 만나서 밥을 먹었어요. (Met my friend and so ate a meal.)
- 맛있지만 너무 매워요. (Delicious, but too spicy.)
- 돈이 없어서 안 사요. (Since I have no money, I don't buy it.)
- 일하고 공부해요. (I work and study.)
Try giving the English meaning for each before checking — that is the fastest way to feel which system each sentence belongs to.
Common mistakes#
| Mistake | Fix |
|---|---|
| 그리고/하지만 + comma-spliced fragments | Each side gets its own complete verb |
| Adding 요 to the mid-clause ending | -고/-지만/-서 take the stem |
| 그래서 and -서 translated as false twins | 그래서 = between sentences; -서 = glued clause |
| Forgetting the main verb keeps politeness | The last verb alone wears 요 |
| Ordering 이유 with 왜냐하면 backwards | 왜냐하면 always introduces the reason |
What this completes in the series#
You now have the full starter loop for Korean: read blocks (Part 1), structure sentences (Part 2), be polite (Part 3), count (Part 4), conjugate (Part 5), schedule (Part 6), survive (Part 7), and now combine thoughts in one flowing sentence. That is the entire foundation — everything after this is words, numbers of words, and nuance.
