so~that .. 주어 동사 부분에서

she is so close to the hyenas that they could attack her.바로 문제의 부분은 could 입니다 앞에는 is 라는 현재형인데 왜 could가 왔는지가 궁금합니다
두번째로는

she is so close to the hyenas that they could attack her.을 enough to 로 바꾼 문장이

she is close to the hyenas enough for them to attack her. 맞는지요?..he loved sharks so much that he decided to live with them all his life.도 바꾸면

he loved sharks much enough to decided to live with them all his life. 맞는지도요..