것이라

In a sentence

• 그것은 미래의 일이 될 것이라 믿습니다.

  I believe that will become a matter of the future.

  In this sentence, '것이라' combines with '될' (to become) to construct a clause indicating a belief about a future state or event.

• 열심히 공부하면 좋은 결과가 있을 것이라 확신합니다.

  I am confident that there will be good results if I study hard.

  Here, '것이라' is used to form the predicate, following '있을' (meaning 'there will be'), expressing assurance or prediction about a condition.

• 그 의견이 모두에게 유용할 것이라 기대했습니다.

  I expected that the opinion would be beneficial to everyone.

  In this instance, '것이라' follows '유용할' (meaning 'will be useful'), expressing the expected utility or potential future state of the subject.