찬성

In a sentence

• 나는 그 계획에 찬성합니다.

  I agree with that plan.

  Here, '찬성' is used to mean agreement or consent toward a suggestion or plan.

• 찬성하지 않는 이유를 말씀해 줄 수 있나요?

  Could you explain the reasons for not agreeing?

  In this sentence, '찬성하지 않는' is referring to the act of disagreement or not consenting.

• 그의 의견을 듣고 나니 찬성할 수밖에 없었습니다.

  After hearing his opinion, I couldn't help but agree.

  The usage of '찬성' here involves coming to an agreement after deliberation or consideration.