Endings and words that join Korean sentences: and, but, so, because, if, when, before, after and while.
-고
And (joins actions or facts)
밥을 먹고 커피를 마셔요
I eat and then drink coffee
그리고
And, and also
-지만
But
비싸지만 맛있어요
It's expensive but tasty
하지만
But, however
그런데
But, by the way
-아서/어서
So, because (a reason)
배가 고파서 라면을 먹었어요
I was hungry so I ate ramyeon
늦어서 죄송해요
Sorry I'm late (sorry for being late)
그래서
So, therefore
-(으)니까
Because, since (often before a request or suggestion)
비가 오니까 우산을 가져가세요
It's raining, so take an umbrella
왜냐하면
Because (at the start of a sentence)
-(으)면
If, when
시간이 있으면 같이 가요
If you have time, let's go together
-(으)ㄹ 때
When (at the time)
한국에 있을 때
When I'm in Korea
-기 전에
Before (doing)
자기 전에 이를 닦아요
I brush my teeth before I go to bed
-(으)ㄴ 후에
After (doing)
수업이 끝난 후에 만나요
Let's meet after class
-(으)면서
While (doing two things at once)
음악을 들으면서 공부해요
I study while listening to music
-거나
Or
주말에 영화를 보거나 쉬어요
At the weekend I watch a film or rest
아니면
Or, otherwise
커피 아니면 차?
Coffee or tea?
그러면
Then, in that case
그래도
Even so, still
-아도/어도
Even if
비가 와도 갈 거예요
I'll go even if it rains
그러니까
So, that's why
먼저
First
그다음에
After that, next
마지막으로
Finally, lastly
예를 들면
For example
사실은
Actually, in fact
피곤하지만 계속 공부했어요
I was tired but kept studying
날씨가 좋아서 산책했어요
The weather was nice, so I went for a walk