있어야

In a sentence

• 그 방에는 충분한 공간이 있어야 사용할 수 있습니다.

  There must be enough space in the room to use it.

  Here, '있어야' is used to express a prerequisite or necessary condition ('must have') for an action.

• 참가 신청서는 작성해 있어야 다음 단계를 진행할 수 있습니다.

  The application form must be filled out to proceed to the next step.

  In this sentence, '있어야' indicates a required status or condition ('must be completed') for progression.

• 여행을 가려면 여행 계획이 먼저 있어야 합니다.

  To go on a trip, a travel plan must be in place first.

  Here, '있어야' refers to the necessity of having something ('must be present') before proceeding with an intended activity.