Charlotte a strong" I save you" 有修改的必要.
建议:"I save you" said Charlotte determinedly which 然後加下半句.
Charlotte devoted all her energy into "it" 因为 "promise" 是单数.
we should sincerely treat a friend,"and" try to help a friend 是两句子须要连接词 "and" 连接起来或 "try" 加 "ing"