이전까지

In a sentence

• 이전까지는 우리가 그런 생각을 한 적이 없었다.

  We had never thought about that before.

  Here, '이전까지' functions as a time expression meaning 'before', suggesting a timeframe prior to now or a specified past event.

• 이전까지 배운 내용을 복습하며 시험 준비를 하세요.

  Prepare for the test by reviewing the material learned previously.

  In this sentence, '이전까지' emphasizes a temporal reference to all material learned up to now, providing comprehension of past learnings.

• 그는 이전까지의 경험을 바탕으로 새로운 프로젝트를 시작했다.

  He started a new project based on his previous experiences.

  Here, '이전까지' describes experiences accumulated up to a certain point in the past, forming a basis for subsequent actions.