과제는

In a sentence

• 어제 제출한 과제는 어렵지만 보람 있었어요.

  The assignment submitted yesterday was difficult but rewarding.

  In this sentence, '과제는' refers to a specific assignment that was the topic of discussion or focus, marked by the topic particle '는'.

• 그 과제는 다음 주까지 마무리해야 합니다.

  That assignment must be completed by next week.

  Here, '과제는' again points to a specific task or assignment introduced earlier or understood in context as the topic.

• 과제는 항상 시간이 걸리는 일이에요.

  Assignments are always time-consuming tasks.

  In this usage, '과제는' refers generally to assignments as a class or category, indicating an ongoing topic.