세계사가

In a sentence

• 나는 세계사가 정말 재미있다고 생각해요.

  I think world history is really interesting.

  Here, '세계사가' refers to the subject of world history as a general concept of study and interest.

• 이번 학기에 세계사가 교과 과정에 포함되어 있습니다.

  World history is included in the curriculum this semester.

  In this sentence, '세계사가' denotes the subject or course often officially included in an academic curriculum.

• 세계사가 어떻게 인간의 발전 과정을 설명할 수 있는지 토의해 봅시다.

  Let's discuss how world history can explain the process of human development.

  Here, '세계사가' is used as a topical focus of a discussion on its relation to understanding humanity.