It is important for the weaker party in a negotiation to determine how committed the leadership of the other side is to reach an agreement and to find ways to heighten the intensity of that commitment. 이 문장에서 to reach가 아니라 to reaching이라는데 왜 그런지 설명해줄 수 있니?ㅠㅠㅠㅠ

인스티즈앱
입짧은 햇님 유튜브 게시물 업뎃 (활동중단 발표)