used to indicate that two things happen at the same time or during something else

~할 때, ~했을 때

used to indicate a period of time during which an action takes place or a state of affairs exists, often denoting simultaneous or concurrent events

~하는 동안, ~하면서

used to denote a continuous period of time starting from a particular event or point in the past and continuing until the present or a specified time

그 이후로, 이래로

used to express that something happens at the same time or right after another thing

일단, 한 번

used to describe a duration or period of time during which something happens or continues to be true

~하는 한, ~하는 동안

used to describe a duration or period of time during which something happens or continues to be true

~하는 한, ~하기만 하면

used to indicate a point in time before which an action or event has occurred or will occur

~할 때까지, ~하기 전까지

used to emphasize the present moment in relation to the topic under discussion

현재 이 시점에서, 지금 이 순간에

used to express the idea of something happening or being done at the appropriate or necessary times

필요할 때마다, 상황에 따라

used to indicate simultaneous action to show that one action or situation occurs at the same time as another

그들이 실내에서 작업을 계속하는 한편, 폭풍우가 밖에서 몰아쳤다.

