바꿔야

In a sentence

• 학교에서 사용하는 교과서를 바꿔야 할 때가 온 것 같아요.

  It seems like the time has come to change the textbooks used in school.

  The word '바꿔야' is used here to indicate a necessity to change or modify the textbooks used in school.

• 창문이 너무 오래돼서 이번 기회에 바꿔야겠어요.

  The window is too old, so I think I should replace it this time.

  Here '바꿔야' expresses the need or plan to replace an old item, in this case, a window.

• 이제는 사고방식을 다르게 바꿔야 할 시점이에요.

  Now is the time to change the way of thinking differently.

  In this sentence, '바꿔야' conveys the necessity of changing or altering one's way of thinking.